428 Lt.-Gol. H. IT. Godwin-Austen on 



pitted sculpture of the shell, in Mr. Ponsonby's collection, 

 but has strong rough lines of growth in addition. 



The animal has no shell-lobes and therefore it cannot be 

 mistaken for a Macrochlamys. The left dorsal lobe is in two 

 parts, the smaller posterior well separated from the larger 

 anterior. The visceral sac is closely mottled with black, 

 with a tendency to form bands of that colour crossing it 

 transversely. Towards the apical whorls black predomi- 

 nates, speckled with white. The branchial chamber is 

 very ample and long. This description is taken from a 

 specimen collected in the forests by Dupont. 



The genitalia (fig. C) are of the same type as in the pre- 

 ceding species, with the same lengthened twisted flagellum. 

 The sperniatheca differs in being more ample and bulbous at 

 the free end. There is also a peculiar dark pigmented 

 globose expansion in the free oviduct, just below the point 

 where the vas deferens is given off, w hich may be an ovitheca. 

 The generative organs agree well with Semper's figure of a 

 Bourbon specimen. 



The radula, like that of the preceding species, has a 

 great number both of admedian and minute marginal teeth ; 

 these and the larger marginals being bicuspid, inner cusp 

 the longest. The formula is: 58 . 2 . 19 . 1 . 19 . 2 . 58, 

 or 79.1. 79. The jaw is solid, cutting-edge concave with 

 central projection. 



Subgenus Dcpontia, nov. 



Type E. perlucida. 



Shell umbilicated, very depresscdly conoid, thin, glassy to 

 the eye. Animal with a mucous gland overhung by a well- 

 developed lobe. Foot divided. 



The penis has a very long flagellum and an accessory 

 organ in the shape of a small sac attached to the penis- 

 sheath towards its distal end. Spermatheca long. Iladula 

 with about 100 teeth in the row : the central and admedian 

 teeth short and blunt with no side cusps ; the laterals evenly 

 bicuspid. 



The generative orgaus, radula, and shell differ from those 

 of Erepta rufozonata &c. — the first, although of the same type, 

 by tbe presence of the peculiar accessory gland ; the second in 

 the form of the central and admedian teeth without cusps. 



A comparison with the African genus Martensia is 

 interesting, because the genitalia are of the same type, as 

 regards an accessory gland being also present {vide Proc. 

 M ulacological Soc. vol. i. pt. 6, July 1895, p. 282, pi. xix. 

 fig. 1 d) ; the radula and shell, however, are quite different. 



