On some Indian Phyllopoda. 1^9 



truncated. The posterior extremity in both specimens is but 

 slightly expanded, and rounded off at the end. The um- 

 bones are not very prominent, and, as in the other known 

 species of the genus, are placed far in front. Seen dorsally 

 (fig. 2), the shell appears less compressed than in the other 

 species, though not nearly so tumid as in the species of the 

 genus Estheria. 



The valves are rather compact and quite opaque, of a 

 very dark brown colour throughout. The lines of growth 

 are far less prominent than in the preceding species and are 

 very numerous, being so densely crowded together towards 

 the periphery as scarcely to admit of being counted. The 

 apposed marginal area exhibits a very close and uniform 

 concentric striation. The surface of the shell between the 

 lines of growth is quite smooth and shining, without any 

 perceptible structure; and the free edges of the valves are 

 smooth throughout. 



The enclosed animal exhibits the structure characteristic 

 of the present genus. It is represented in fig. 3 from the 

 left side as exactly as possible after having been extracted 

 from the shell. 



The head (see also fig. 4) differs very conspicuously 

 from that of the preceding species in the form of the occi- 

 pital projection, which is considerably more produced and 

 abruptly recurved, terminating in a sharp point. It also 

 differs from that in the type species, L. siliqua, in which 

 this projection is still more produced and more regularly 

 falciform in shape. The ocular region, as in L. nobilis, is 

 distinctly protuberant, and the rostral part appears some- 

 what larger than in the female of that species, and less 

 narrowed at the end, with the apical spine but slightly pro- 

 curved. 



