Extensive migration by young persons attending school has altered drastically the population structure of the small community on Namoluk Atoll, Caroline Islands. This alteration seems likely to  lead to a continuing decline in the atoll's de facto population, the continued erosion of the community's self-sufficiency, an acceleration of the trend toward atoll exogamy, and the likelihood that Namoluk's educated young adults increasingly will emigrate from the Trust Territory to the United States and elsewhere in search of employment opportunities unavailable at home.

The comparative morphology of nine taxa of the genus Bostrychia collected from Southwestern Japan, Hong Kong and Guam is presented. The number of pericentral cells of each central cell ranges from two to four among the taxa. The uppermost pericentral cell of taxa examined always contains two nuclei. The ftagellar haptera of Bostrychia tenuis f. simpliciuscula, B. hamana-tokidai, B.  binderi, B.  tenella and  B. mixta consist of ventral and side pericentral cells. B.  radicans, B.  moritziana, B.  kelanensis and  Bostrychia sp. have hapteronous branches transformed from the  ordinary branches. In  some taxa, new  buds are  formed at  tips  of hapteronous branches. In B. radicans and B.  moritziana an  erect branch and a hapteronous branch are successively initiated from the main axis. Each tetrasporangium of the taxa examined is accompanied by a tetrasporangium mother cell linked by pit-connections with both a central cell and the lowermost cover cell. 

The morphological characteristics of Thorea gaudichaudii C. Ag. from freshwater habitats in Guam (water temperature 28°C) and Okinawa (water temperature 21-22°C) are compared. The mean cell width of both specimens are similar (5.2 μm), but the mean cell length of the Guam specimens are somewhat longer (25.5 μm) than the specimens from Okinawa (21.4 μm). The mean length and width of the monosporangia of both specimens are similar.

AII  species of  dicotyledons known from Micronesia are  listed along with their distribution by islands. Basionyms, synonyms and misapplied names that have been used for Micronesian plants are also listed. 1342 species and varieties are listed, 662 of them indigenous, 680 exotic. Of the  indigenous ones, 78  are  endemic to  the  Marianas, 267  endemic to  the Carolines, 24 endemic to the two groups, the remainder are more widespread, 4  are named hybrids. The relationships of the flora are mostly Indo-Malesian and with the Melanesia-New Guinea area. The strand and coastal plants are mostly widespread, some of them pantropical. 

Three samples from each of two microhabitat types (one was sand/rubble under dead coral rocks, the other was solid limestone with a thin layer of algal-bound sand) were collected from Heron reef  crest (23°27'S, 151°55'E), southern Great Barrier Reef. In  total, 931 polychaetes representing 20 families were recovered by seiving through an 0.1 mm mesh. Mean polychaete density for the 3 loose sand samples was 28 individuals/liter whereas it was 480 individuals/liter for the 3 solid limestone samples. For the solid substratum this is approximately 24, I 00 polychaetes/m2. Of the 6 samples, 2 were sorted to species level and four to family level only. The loose sand sample sorted to species level contained 26 individuals, 16 species and species diversity H' =2.65. The single solid limestone sample sorted to species level contained 239 individuals, 41 species and H' = 2.85. The 3 solid limestone samples were more similar to each other than to the three loose sand samples, which were also more variable. The 3 loose sand samples shared only 2  families, Syllidae and  Eunicidae, while the 3 solid limestone samples shared 8 families-Syllidae, Eunicidae, Nereidae, Chaetopteridae, Capitellidae, Amphinomidae, Terebellidae and Maldanidae. The Heron reef limestone samples were very similar in general characteristics to the polychaete assemblages in  truncated reef limestone s'amples from East Indian Ocean and  Guam with respect to the mean density, the numerical predominance of Syllidae and the abundance of Eunicidae.