I92I.] 



B. Prashad : Notes on Laniellibranchs. 



147 



sufficient extension. The two siphons are quite separate and are 

 of an ashy-gre}' to violet colour. The aperture of the branchial 

 siphon is about one and a half times as high as the anal ; it bears 

 two rows of elongate papillae along its margins while the anal has 

 onl}' a single row. 



The attachments of the gills are similar to those in the genera 

 Corbicula and ViUorita, except that the attachments of the outer 

 lamellae of the outer pair of gills with the mantle is very much 

 curved and rather sinuous. Both pairs of gills are of the same 

 length, but the outer pair is broader in its entire length than the 

 inner. 



The palps are ver>' large, broad, very thin and somewhat 

 leaf-shaped ; the inner pair is somewhat larger than the outer one. 



Text-fig. i. — Soft parts of B. violacea var. celebensis. Martens. 

 F. foot, /.G. inner gill, M. mantle, O.G. outer gill, P. palp, 5'. siphons. 



The foot is large and well developed with a sharp margin, 

 but is not very thick. 



Remarks. — The soft parts of Batissa resemble those of Corbi- 

 cula and ViUorita in general, but differ in the mantle being thicker, 

 the pallial muscle-fibre region not distinctly separated, the larger 

 gills, the shape, form and large size of the thin leafy palps, and 

 the form of the foot. 



1859. 



1 866. 

 1869. 



Batissa similis, Prime. 



Batissa similis. Prime. Ann. Lyceum Nat. Hist . Soc. New York 



\11, p. 112. 

 Batissa similis, id., ib., V'lII, p. 2_>g, fig. 60. 

 Batissa similis, Prime, Cat. Corbiculidae mAmer. Jottrn, Conch. 



V, p. 140. 



