54 Records of the Indian Museum. [Vol. XIX, 



The foot is comparatively short but wide with a free anterior 

 oblique surface presenting a vertical ridge ; it is flattened from 

 side to side and is widest at the junction of the anterior and 

 middle thirds of its length ; lastly, it presents an oval patch of 

 transverse folds on its ventral surface posteriorly. 



The labial palps are triangular, being about one-fourth the 

 body in length. The gap between the anterior lip and the anterior 

 adductor muscle is comparatively short. 



The gills are about half the body in length, and are about 

 live times as long as broad; they are prolonged to the base of 

 the labial palps ; the visceral portions of the gills are about as long 

 as the cloacal portion. The lamellae are separated by long inter- 

 lamellar septa extending alternately between the principal fila- 

 ments, and the pHcae of both the lamellae are free from one another. 

 The oesophagus is short and nearly horizontal. The oeso- 

 phageal stomach is narrow and elongated, and separated from the 

 flattened cardiac chamber by a prominent muscular ridge. The 

 pyloric chamber is wide and extends posteriorly beyond the coe- 

 cum as a rounded sac. The coecum of the crystalline style is long 

 and extends forwards along the ventral aspect of the visceral mass. 

 The intestine begins close to the pyloric coecum and passes 

 along the anterior aspect of the coecum forming loosely coiled 

 folds. Without reaching the anterior end of the coecum, the 

 intestine turns back and passes along the right side of the coecum 

 to end in the rectum with a sharp bend. 



Shell. Thick, strong, epidermis yellowish, with wide vertical 

 flesh-coloured stripes above and long indistinct horizontal stripes of 

 the same colour below the diagonal line from the antero-superior 

 to the posterior inferior corner. Epidermis slightly corroded in 

 its posterior upper quadrant. Length 4 to ^^ times as long as 

 broad. Greatest width near the posterior end. Anterior margin 

 straight, sloping forwards from above, with the antero-superior 

 angle obliquely truncate, and the antero-inferior angle slightly 

 rounded. Posterior margin nearh^ straight, sloping backwards 

 from above, and strongly rounded above and below. Umbonal 

 teeth anterior, one in each valve, left tooth slightly stouter than 

 the right. 



Anterior adductor impression wide, elongated. Anterior 

 retractor at a short distance behind and above the level of the 

 anterior adductor. Posterior adductor impression small and ovah 

 Posterior retractor triangular, smaller than posterior adductor. 

 Retractor siphonis impression elongately oval. 

 Length 64 mm. Breadth 15 mm. 



Solen graveiyi, sp. nov. 

 (PI. II, figs. 6-9). 

 Three specimens of this species were collected by Dr. F. H. 

 Gravely at Chandipore, Balasore (Orissa).' They seem to form a 



I See Gravely, Rec. hid. Mits., X\'I, p. -^95 (1919) 



