FOSSARUS. 275- 



obtusely angulated periphery; outer lip undulated by the spiral 

 sculpture. Length, 2 mill. 



Atlantic Ocean (Porcupine Exped.) 



F. TUBERCULATUS, Watson. PI. 52, fig. 15. 



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

 with spiral, 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 Culebra Isl, West Indies; 390 fins. 



The styliform apex consists of 3 whorls, the first two smooth, the 

 last with a half dozen spiral threads. 



Genus FOSSARINA, Ad. and Angas. 1863. 



F. PETTERDI, Brazier. PL 52, figs. 20, 21. 



Narrowly umbilicated, faintly spirally striate, with hardly visible 

 longitudinal striae, dark purplish black, with a few irregular white 

 markings ; whorls 3, convex, the last large and rounded, umbilical 

 region white ; interior greenish black, showing the external white 

 markings. Operculum thin, many-whorled. Diam. 4*25 mill. 



Hobart Town, Tasmania. 



Hutton remarks that this species has the dentition and opercu- 

 lum of the Trochidse 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. PL 52, fig. 16. 



Widely umbilicated, spirally lirate, yellowish, irregularly macu- 

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



Diam. 3 mill. 



Japan. 

 F. BRAZIERI, Angas. PI. 52, fig. 17*. 



Narrowly umbilicated, rather solid, ash grey, maculated with 

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

 prominent, like carinse, longitudinally striated ; whorls 3, with well- 

 impressed suture. Diam. 3*5 mill. 



Port Jackson, Australia. 



F. FUNICULATA, Tenison Woods. PI. 52, figs. 18, 19. 



Subumbilicated, solid, opaque, almost ear-shaped, with rounded 

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



