Volume 76, Issue 4
October 1972, pages 133-180
pp 133-152 October 1972
Study of recent collection of echinoids from the Bagh Beds has yielded four new species. Distribution of the echinoid species in these strata does not warrant treating each constituent member of the series as a distinct unit having its own characteristic species or an assemblage of species; and in spite of their lithological differences, they together constitute a single palaeontological unit. Affinities of these echinoids range from Aptian to Senonian; but their mixture in all the strata, lower as well as upper, shows that Cenomanian is the most conspicuous element throughout. Also, the two generaPolydiadema andTetragramma not known to survive the Cenomanian times set this as the upper age limit, and six out of eight species ofHemiaster belong to the subgenusMecaster appearing in Cenomanian, and thus set the lower age limit for the ‘Bagh echinoid fauna’. Thus this echinoid fauna has to be taken as of Cenomanian age. Further, their faunal affinities are undoubtedly with the Mediterranean Palaeo-zoo-geographic province, particularly the North African region.
pp 153-164 October 1972
Amphibolites, east of Khammam, Andhra Pradesh, are associated with schistose and migmatitic gneisses of the Precambrian Tanikalla metamorphic complex. Quantitative estimation of the trace elements (V, Cu, Cr, Co and Ni) of the amphibolites are made. The results are discussed in the light of the observations of earlier workers. The petrogenetic complexities of the amphibolites are studied in detail based on the abundances, distribution patterns and the relationships of certain pairs of trace elements. The contents of V, Cr, Co and Ni in the amphibolites are nearly the same as in basaltic rocks, and suggest that the amphibolites are derived from mafic igneous rocks of basaltic composition.
pp 165-170 October 1972
Two new species of miorosporidian parasites,Pleistophora sauridae n.sp. andNosema sauridae n.sp. parasitising visceral muscles of the marine fish,Saurida tumbil have been described. The infection is light and occurs throughout the year. The parasites are apparently harmless to the host. These are the first records of microsporidian parasites from the present host.
pp 171-180 October 1972
The macroscopical and microscopical characters of the stem, leaf and root ofSwertia alata have been described in detail. Quantitative data on stomatal index, stomatal number and epidermal count have been presented. The anatomical distinguishing characteristics betweenSwertia chirata andSwertia alata have been tabulated.