IBYCUS. SATIELLA. 221 



Ibycus. [There was sufficient to show in the generative organs the 

 presence of the amatorial organ and simple form of male organ.] 



Animal not differing much from Durgella. Col. Godwin- Austen 

 has called attention to the similarity of the radula in the Assam 

 and Celebes shells of the genera Ibycus and Leptodontarion. 



Teeth in the radula 190 . 1 . 190 in each row. Jaw slightly 

 arched, without a median projection. 



Genus SATIELLA*. 

 [Fig. 77, p. 222.] 



Type, S. dekhanensis, God win- Austen. 



Range. Southern India. 



Shell very thin and membranaceous, Fltomia-like, depressedly 

 globose or depressed, with few whorls and a large mouth. 



Mantle with well-developed shell-lobes extending over the shell. 

 Behind the shell the foot is generally carinate and ends posteriorly 

 in a long lobe, on the under side of which is the mucous pore. 

 The sole has a median and two lateral tracts, clearly divided. 

 There is no dart-sac or amatorial organ ; the spermatheca is club- 

 shaped, a pear-shaped or cylindrical body with a narrow neck 

 opening into the oviduct. The vas deferens expands gradually into 

 a wider portion (epiphallus ?) leading to the short caecum, to which 

 the retractor rnuscle is attached. 



Teeth very numerous, in S. levidensis (fig. 77, E) 350 to 400 on 

 each side of the rhachidians ; the median and admedian teeth 

 appear to be bicuspid, whilst some of the outer teeth have a 

 multicuspid outer edge like that of a saw. 



Both the shell and radula differ considerably from those of 

 Durgdla. 



329. Satiella dekhanensis, Godwin- Austen (Durgella), Mol. Ind. ii, 



1898, p. 68, pi. 78, 'figs. 1-2 d (shell and animal) ; var. bicolor, 

 figs. 3-5 (shell, animal, and generative organs). 

 [Fig. 77, A, B.] 



Shell very thin, quite membraiiaceous and soft, depressed, 

 translucent, smooth, polished, rich sienna-brown in colour ; spire 

 low, apex flat, suture linear; whorls 3|, the last large, sometimes 

 angulate at periphery (perhaps through pressure) ; aperture lunately 

 ovate ; peristome very thin. 



Major diam. 18-5, min. 15, height about 8 mm. 



Hob. Travancore, in Southern India. 



The shell is so soft that it is difficult to say whether the peri- 

 phery is subangulate or not. 



Animal (fig. 77, A) with a narrow foot, sharply keeled behind, and 



* From " Sati " or " Durga," also known as " Parvati." 



