Volume 72, Issue 4
October 1970, pages 139-186
pp 139-148 October 1970
The chemical analyses of 3 orthopyroxenes from the Kondavidu charnockites are presented along with their structural formulae calculated on the basis of six oxygens. The atomic ratio 100 Mg/(Mg + Fe+2 + Fe3+ + Mn) of the analysed orthopyroxene, varies from 44·7 to 51·6. The high and variable nature of the alumina content of orthopyroxenes is discussed. The optical properties of orthopyroxenes of ultrabasic, basic, intermediate, and acid charnockites are given. The composition, as deduced from optical properties, is expressed in terms of end-member molecules and varies from En83Fs17 to En26Fs74. The D (x) values, calculated according to the method outlined by Dobretsov (1968), indicate low-temperature formation for the Kondavidu orthopyroxenes.
pp 149-155 October 1970
The paper reducesAlectoria acanthodes Hue to the synonymy ofA. divergescens Nyl., describes a new speciesAlectoria confusa Awas., reports the occurrence ofA. implexa (Hoffm.) Nyl. from Nepal and makes a plea for the revision of the systematic position of the genusAlectoria into an independent family Alectoriaceae.
pp 156-161 October 1970
The validity of characters, distinguishing the various species of the genusPatagifer Dietz, 1909, have been discussed.P. chandrapuri Srivastava, 1952;P. srivastavai Peter, 1954;P. sarai Saksena, 1957, have been reduced in synonymy withP. wesleyi Verma, 1936 andP. simarai Nigam, 1944, in synonymy withP. bilobus (Rudolphi, 1819) Dietz, 1909. A key to the species of the genus has also been given.
pp 162-170 October 1970
Two new species of strigeid metacercaria belonging to the larval genusDiplostomulum Brandes, 1892, are described from freshwater fishes of Lucknow.
pp 171-178 October 1970
pp 179-186 October 1970
Embryogeny and seed germination stages have been studied. Two types of proembryo have been recorded. The suspensor is long and assumes a tortuous shape in its final position in the endosperm. Very small portion of the proembryo is used for the formation of the embryo proper, greater portion is being used for the formation of suspensor and the haustorial tissue. The embryo grows at first towards the centre of the endosperm, when it reaches almost the bottom of the endosperm, it begins its growth towards the micropyle. During this growth, the different parts of the embryo-coleorhiza, cotyledons and plumule are organised.