224 Records of the Indian Museum. [Voi,. VIII, 



Depth of the circumpedal groove . , . . . . '2 



Length of the foot . . . . . . . . 2'6 



Width of the foot sole . . • • • • '3 



Distance of the male aperture from the anterior end of the 



foot . . . . . . . . . . -15 



Distance of the female aperture from the anterior end of 



the foot . . . . . . . . • • "5 



Length of the head . . . . . . . . '25 



Length of ommatophore . . . . . . "i 



Thickness ,, . . . . . . "05 



Length of the precephalic flap . . . . , , "055 



Length of the protruded proboscis . . . . . . '45 



Width of the keel . . . . . . . . -05 



Width of the mantle border . . . . . . "08 



Colouration. — The surface of the mantle (notum) is sepia, 

 marked with numerous black lines which pass in various directions 

 forming a ver}^ irregular open meshwork ; the wide and irregular 

 meshes are occupied by blotches of the same colour. The ommato- 

 phores, the lower tentacles and the dorsal aspect of the precephalic 

 flap (excepting a narrow strip along the anterior border) are slaty- 

 blue, the sole is of the colour of light Indian ink with the rim 

 yellowish white 



Anatomy. 

 /. Pallial Cojnplex. 



The pulmonary area is broadly reniform in shape, the greatest 

 breadth lying in a transverse direction. It lies behind the line 

 of attachment of the mantle to the body behind the head. The 

 area extends both to the right and left side of the body beneath the 

 mantle, being continued to the junction of the mantle to the base 

 of the foot on the right side, but ending about 1*5 mm. above on 

 the left. The roof of the pulmonar}' area is fused with the mantle, 

 as well as with the dorsal wall of the pericardium. The floor lies on 

 the anterior end of the liver, the salivary gland and the radular 

 portion of the pharynx. There is no pulmonary chamber. 



The pericardium lies in the anterior one-third of the pulmo- 

 nary area. It extends a little more to the right than to the left. 



The heart lies a little obliquely, the ventricle being placed a 

 little in front of the auricle and to the left. The auricle is placed 

 just beneath the middorsal line of the body. 



The kidney occupies the rest of the pulmonary area. It is a 

 spongy mass bounded both on the inner and outer aspect by a thin 

 membrane forming the floor and roof of the pulmonary area. 



II. Digestive System. 



The proboscis was protruded in the specimen and the pharynx 

 was placed inside the proboscis sheath. Fine strands of connective 

 tissue w^ere seen extending from the inner side of the proboscis 



