223 



each whorl flat above, connected by a slightly channelled suture. Sculpture consisting of spiral 

 lirae, 8 in number on the last whorls; the infrasutural, the fifth and seventh spirals are more 

 prominent and stronger than the rest; these lirae are crossed by very fine growth-striae and 

 by moderately fine ribs, rendering the lirae crenulate in crossing them, the fifth is even tuber- 

 culiferous in some parts; periphery strongly keeled; keel wavy or denticulate by distant short 

 spines, the spaces between them crenulate; keel flat above, concave below, the rest of base 

 convex untill the umbilicus; base inclusive of the under surface of the keel, sculptured by fine 

 spiral lirae of which the innermost 4 are stronger and granular, especially the spiral bordering 

 the umbilicus, which is tuberculate, the whole base is crossed by radiating striae rendering even 

 the finer lirae crenulate. Umbilicus very large, occupying more than half the diameter, open, 

 leaving the volutions visible, each whorl has a row of large granules along the lower suture 

 and 2 a 3 finer ones crossed by radiating striae. Aperture much broken, probably circular, 

 containing the characteristic operculum. 



Alt. 3, lat. 97,, lat. of umbil. 4^, Mill. 



This remarkable mollusk, which is not allied to any species I know, was unfortunately 

 considerably damaged, especially at its basal surface, in consequence I could not make out shape 

 and size of the aperture. It probably deserves a subgeneric name, but it being so incomplete, 

 I have provisionally left it in company with the other typical species. 



Section Ptenoglossa. 



Fam. ScALiDAE. 



Scala Klein. 



1. Scala Pallasii Kiener. 



KlENEK. Coq. Viv. Vol. IX, Scalaria, p. 4, PI. 2, fig. 3. 



Reeve. Conch. Ic. Vol. XIX, Scalaria, fig. 40. 



Tryon. Man. of Conch. Vol. IX, p. 54, PI. 11, fig. 33. 



Clessin. Martini-Chemn. Conch. Cab. Ed. II, Vol. II, Scalaria, p. 59, PI. 16, fig. 2. 



Stat. 248. Rumah Lusi, North point of Tiur-island. Till 54 M. i Spec. 

 The only specimen is fine but not adult. 



2. Scala alata Sowerby. 



SOWERBY. Proc. Zool. Soc. Lond. 1S44, p. 10. 



Reeve. Conch. Ic. Vol. XIX, Scalaria, fig. 15. 



Tryon. Man. of Conch. Vol. IX, p. 55, PI. 11, fig. 40. 



Clessin. Martini-Chemn. Conch. Cab. Ed. II, Vol. II, Scalaria, p. 20, PI. 3, fig. 5. 



Stat. 2. Madura-strait. 56 M. Grey mud. I Spec. 



Stat. 116. West of Kwandang-bay-entrance. 72 M. Fine sand with mud. 3 Spec. 



The specimens from Stat. 116 are quite white, perhaps bleached.. The whole party is young. 



115 



