F08SARUS. 275 



obtusely angulated })eriphery ; outer lip undulated by the spiral 

 sculpture. Length, 2 mill. 



Atlantic Ocean. (Porcupine Exped.) 



F. TUBERCULATUs, Watsou. PI. 52, fig. 15. 



Solid, glossy white; whorls 7 .5-8, flattened, slowly increasing, 

 with s])iral, stoutly tuberculated ribs, of which there are four on 

 the body whorl, periphery angulated, lip varicose, continuous, in- 

 terior margin double. Length, 1'75 mill. 



Off OiUebra IsL, West Indies ; 390 fms. 



The styliform apex consists of 8 whorls, the first two smooth, the 

 last with a half dozen spiral threads. 



Genus FOSSARINA, Ad. and Angas. 18(>3. 



F. PETTERDi, Brazier. PI. 52, figs. 20, 2L 



Narrowly umbilieated, faintly spirally striate, with hardly visible 

 longitudinal strict, dark purplish black, with a few irregular Avhite 

 markings ; whorls 8, convex, the last large and rounded, umbilical 

 region white ; interior gi-eenish black, showing the external white 

 markings. Operculum thin, many-whorled. Diara. 4'25 mill. 



Hohart Town, Tasmania. 



Hutton remarks that this species has the dentition and opercu- 

 lum of the Trochidai but not of the Littorinidse, and that it may 

 possibly be an Adeorbis. Proc. Linn. Soc, N. S. W., vii, 66. 



It has not the pearly nacre of Trochus. 



F. Simpsoni, Tenison Woods, is a synonym. 



F. PiCTA, A. Ad. PI. 52, fig. 16. 



Widely umbilieated, spirally lirate, yellowish, irregularly macu- 

 lated with chestnut ; whorls 4, convex, periphery rounded. 



Diam. 8 mill. 



Japan. 

 F. Brazieri, Angas. PI. 52, fig. 17. 



Narrowly umbilieated, rather solid, ash grey, maculated with 

 purplish brown, irregularly spirally ridged, two of the ridges more 

 prominent, like carinie, longitudinally striated ; whorls 82, with well- 

 impressed suture. Diam. 8*5 mill. 



Port Jackson, Australia. 



F. FiJNicuLATA, Tcnison Woods. PI. 52, figs. 18, 19. 



Subumbilicated, solid, opaque, almost ear-shaj)ed, with rounded 

 alternately larger and smaller spiral ribs, more minute on the base; 



