6 • SOLARIIDiE. 



few; aperture oblique; umbilicus small, rounded, its margins 

 without crenulations. 



Fossil, Silurian. United States ; Europe. 



Genus FLUXINA, Ball, 1882. 



" Shell porcellanous, depressed conical, umbilicate, strongly 

 carinate, with a stout umbilical rib, above which the pillar is 

 thin and emarginate ; from the umbilical rib to the carina the 

 basal margin of the aperture is deepl}^ flexuously emarginate ; 

 above the carina it is again but less deeply emarginate, then 

 sweeps forward roundlj^ and then slightl}' recedes before joining 

 the preceding whorl. 



Tliis curious form belongs in all probability. to the Solariida ; 

 representing among them Basilissa among the Trochidiie and 

 recalling Platychisma, but with a ditierent aperture. When 

 perfect the' margin at the carina must project forward like a 

 claw, or nail, as in Schizostoma. When adult, the nuclear 

 whorls are filled up with a solid deposit of shelly matter, and it 

 is probable that there is a slight notch at the end of the umbili- 

 cal rib." . West Indies. 



( Toriniinie.) 



Genus TORINIA, Gray, 1840. 



Shell turbinately elevated or in some instances planorbiform ; 

 umbilicus typically moderate to w,ide, perspective, its margins 

 slightly crenulated ; lip and columella simple. Opei'culum cor- 

 neous, typically conically elevated, externall^'^ spiral, of numer- 

 ous volutions margined by projecting edges; internal face 

 smooth, bearing a spirall}^ twisted, median projection (PL 1, 

 tig. 13). 



Tropical seas, world-wide. Fossil, Paris Basin. 



Subgenus Torinia, Gray (restricted). 



Shell turbinately elevated ; whorls rounded, granulated, si)ir- 

 ally ribbed ; aperture subcircular, lip simple, columella perpen- 

 dicular and thickened. Operculum t3'pical. 



Animal (PI. l,fig. 10) with thick, long obtuse tentacles, the 

 eyes situated upon swellings near their outer bases ; foot very 

 large in proportion to bod}^ and shell, oval, emarginate and 

 auriculate in front. 



