On some Indian Phyllopoda. 13 



bones, Avhich project slightly above the level of the hinge. 

 Both in front and behind, the dorsal margin terminates ab- 

 ruptly, forming- a well-marked angle with the adjoining free 

 edges of the valves. The ventral margin is gently curved, 

 and joins the anterior and posterior margins without any 

 intervening angle; in the middle, however, the curvature is 

 very slight. The anterior extremity is much shorter than 

 the posterior, and appears somewhat irregularly truncated 

 above the longitudinal axis, the edges at this place being 

 slightly flexuous. The posterior extremity is somewhat 

 broader than the anterior and obliquely expanded. Seen dor- 

 sally (fig. 2), the shell appears rather compressed, with the 

 greatest width in the anterior part. The umbones, as in L. 

 siliqiia, occur far in front, at about the anterior fourth part 

 of the length of the shell. 



The valves are quite devoid of any coating of ex- 

 traneous matter, are semipellucid and with a glossy lustre. The 

 lines of growth are strongly marked, rib-like, and arranged 

 in a remarkably regular manner, about 20 being counted on 

 each valve. The surface between the ribs, when strongly 

 magnified, appears finely dotted. The edges of the valves 

 are quite smooth throughout their whole length. ■ 



The colour of the shell in the preserved specimens is a 

 light chestnut, somewhat darker along the dorsal face. 



As regards the enclosed animal, in most of the spe- 

 cimens, the anterior part of the head together with the an- 

 tennae projects in front from the shell, and the distal part 

 of the tail behind (see fig. 1). If one of the valves be re- 

 moved, the rest of the animal can also be subjected to a 

 jDreliminary examination, and it is then easily seen that in 

 all essential characters the animal agrees with the male 

 of L. 'siliqua, as described by the present author. On a 



