54 



RECORDS OF THE AUSTKALIAN MUSEUM. 



Fitf. 21. 

 liarthytoma sarcinula. 



fine spiral grooves, continued on the adult 

 as broad, shallow furrows, which are- 

 broadest at the sutuie becoming smaller 

 and closer antei iorly. On the last whorl 

 are twenty-two spiral i-ibs, on the penul- 

 timate six ; the latter ai-e latticed by fine 

 radial riblets. The whole shell is crossed 

 by fine, arcuate growth lines. Aperture 

 narrow, sinus deep, lip thin, straight, pro- 

 duced medially, edge crenulated by the 

 sculpture. No callus on the inner lip. 

 Columella broad and twisted ; canal not 

 produced. Length, 7 mm.; breadth, 4 

 mm. , 



One specimen represents this species, 

 which is broader than B. biconica,' at a 

 corresponding length. 



Cylichxa tenuis, sj). nov. 



(Fig. 22). 



" Shell small, elongate, subcylindrical, a 

 little contracted at each extremity ; trun- 

 cate at the summit, smooth translucent, 

 .sometimes with an o^jaque belt or row 

 of patches around the upper quarter of 

 the body whorl, Sculpture, a small spiral 

 thread keel runs around the vertex, fine 

 growth lines radiate the summit, but are 

 scarcely perceptible on the sides of the shell. 

 .•\pical perforation narrow, deep, a seventh 

 of the shell's diameter, partly showing tlie pen- 

 ultimate whorl. Aperture long, perpendicular, 

 narrow, a slight callus laj'er spread on the 

 iinier lip. Columella a little thickened, spirally 

 twisted. 



Length, 245 mm.; breadth TOo mm. 



Two examples. 



h 

 Fig. 22. 

 Ciilicna tenui-^. 



7 Hedlev— Austr.Mus. Mem., iv., 1903, p 385 f. 98. 



