Volume 66, Issue 4
October 1967, pages 117-177
pp 117-122 October 1967
Three new species and one known species are described in this paper. All the species were collected from Western Sikkim. The species belong to four genera distributed in the family Salticidae.
pp 123-142 October 1967
Studies on the macrofauna from the five selected stations spread over a distance of about 25 km. in the Cochin backwater showed that the benthic biomass was greater in the regions which were near the sea. The abundance of organisms decreased progressively towards the more estaurine zone. The bivalves, gastropods and polychaetes were the most predominant forms in the sample. The presence of larger bivalve,Meretrix ovum and the polychaete,Diopatra neopolitana at the stations near the sea considerably increased the benthic biomass at these stations. Organisms of lesser importance were crabs, fish, ophiuroids and sea anemones. Studies on meiobenthos which was restricted to the estuarine zone only showed a high degree of abundance of foraminiferans and nematodes. Foraminiferans were more abundant at stations nearer the sea suggesting their preference for marine conditions. The nematodes on the other hand were more dominant at stations away from the sea. An examination of the substrata at five stations showed that the conditions were different from one place to the other. A substratum of fine and coarse sand seems to support a denser benthic population.
The distribution and abundance of macro and meiobenthos when compared with the seasonal changes in physico-chemical conditions of the backwater was investigated. It appeared that perhaps the most important factor governing the quantitative distribution of benthos is the salinity. Settling stages of bivalves and gastropods, which are of purely marine origin, though appear in large numbers, do not survive in estuarine conditions. Areas of high salinity in the backwater are those which are rich in nutrients and chlorophyll and were found to support a denser benthic population.
pp 143-156 October 1967
This paper gives an illustrated account of 7 species, 2 varieties and one new form of Clavariaceae collected from Dalhousie Hills (North-Western Himalayas) and Darjeeling Hills (Eastern Himalayas). All these are new records for India.
pp 157-163 October 1967
pp 164-177 October 1967
Some twelve types of trichomes are described for four species ofJasminum andNyctanthes arbor-tristis L. They fall under two main categories, the eglandular and the glandular trichomes. The systematic position ofNyctanthes seems to be quite natural in the family Oleaceae.