Volume 34, Issue 6
December 1951, pages 273-334
pp 273-310 December 1951
The origin of a ciliated larva from the gemmule of a horny sponge (Hircinia sp.) is recorded here for the first time. The larval development resembles that ofEsperella fibrexilis (Wilson, 1894) and of the HexactinellidsVentrollula fertili andLeucopsacus orthodocus (Ijima, 1901).
pp 311-328 December 1951
Detailed descriptions are given of the morphology and bionomics of the following species:Amphipnous fossorius sp. nov.,Symbranchus bengalensis (McClleland),Tænioides cirratus (Blyth), andTrypauchen vagina (Bloch and Schneider). It is pointed out that the first one is a typical burrower.
Adaptations for a burrowing habit such as shape of body, snout, loss of fins, etc., are described and discussed in all the four forms.
An account of the eyes in all the four forms is given. The eyes are reduced in size in all and show various degrees of degeneration. The cephalic cutaneous organs inTænioides cirratus (Blyth) andTrypauchen vagina (Bl. and Sch.) and the lateral cutaneous organs also of the former are described.
pp 329-334 December 1951
The sclereid initials ofMemecylon heyneanum show a terminal or sub-terminal relationship with the procambial strands as reported in the allied genusMouriria huberi (Foster, 1947). The irregularly shaped initials soon acquire a tube-like shape and show local apical growth as reported inMouriria huberi. Sometimes they branch, especially beneath the epidermis.
The occurrence of sclereid initials near the differentiating procambial strands and their strictly terminal or sub-terminal relationship confirms the close relationship betweenMouriria andMemecylon under the sub-tribeMouririees under the family Melastomaceœ,—a fact which was recognised by Van Tieghem as early as 1891.