MOLLUSCA OF INDIA. 191 



squarish plates. Basal plates of teeth of the radula square or 

 oblong ; central teeth tricuspid, laterals multicuspid. No mucous 

 gland at extremity of foot. Generative organs simple. No amatorial 

 organ and no accessory organs. Shell small, many-whorled, pyri- 

 form or trochiform with a single liration, unicoloured." 



Philalanka secessa, Godw.-Aust. 



Original description : — " Shell pyramidal, base convex, narrowly 

 umbilicated. Sculpture fine, irregular, costulate transverse lines ; 

 a single lirate band follows the angulation of the whorl throughout, 

 with another on and above the suture ; on the under side an 

 exceedingly fine striation may be seen with a high power ( x 60). 

 Colour pale ochraceous, with a greenish tinge. Spire conic, sides 

 nearly flat ; apex blunt. Suture shallow, with a thread-like 

 liration. Whorls 8, narrow ; sides very slightly convex below 

 the liration, flat from that to the suture. Aperture semilunate, 

 narrow, vertical. Peristome thin, slightly reflected on the 

 columellar side, which is suboblique. 



" Size: major diam. 7, alt. axis 6 mm. 



" Hah. Ambegamuwa, Ceylon, 3000 ft. (0. Collett)." 



This very interesting species was found among dead leaves in the 

 forest ; and to Mr. 0. Collett is due the credit of being the first to 

 collect a form which enables me to show the occurrence in India of 

 a group of shells not hitherto recorded from any part of that 

 region. Nothing like it has been found to the east of the Bay of 

 Bengal, on the North-east Frontier, or in Burma ; but the possibility 

 of its being a casual introduction is removed by the discovery of 

 another allied species, in the south of the Indian Peninsula, by 

 Colonel Beddome. 



I have examined two specimens which were preserved in spirit. 



The animal has a distinct peripodial groove and broad pallial 

 margin, with a fringe-like structure, very colourless in contrast 

 with the foot above ; but it has no mucous pore. The right dorsal 

 lobe is large, with a very pale, narrow outer margin ; the left 

 rather narrow, its widest portion being in the middle ; both are 

 darker than the foot of the animal, which is pale grey with a paler 

 margin. The sole is not divided. The salivary glands, disposed in 

 two long masses on either side of the oesophagus, are of a dark tint. 



The generative system is simple and devoid of accessory parts ; 

 the male organ is sharply bent on itself near the generative aperture, 

 the retractor muscle being given off low down from the second bend. 

 It thence narrows, becoming gradually whip-like, into the long 

 vas deferens, forming a long loop in a backward direction, and 

 returning as usual to pass between the retractor muscles of the eye- 

 tentacles. The male organ, as far as the loop, is solid, pink in 

 colour, and conspicuous on dissection. At the anterior end it 

 terminates in a bluntish knob. The spermatheca is globose, with a 

 thin stalk-like tube which joins the vagina high up, and, connected 

 with it, passes downwards into the common sheath of the vagina. 



