j ; , 

 Bubgeni] i M \ M 



Shell ovate ; \vhorU r.itin<|. -I. 

 suture; aperture OVSte, li|> thin. OODtfal 



!. perforated b -mall iimhiii 



linrs anil farroWS, I-. i i M ii IM \ i v. M 



i. Conch., i. ii 



FAMILY 



Head prODOSCidifonn, with a median huiL'itiidina. 



olee thread-like, sharp, >:il bane; 



frontal lobes between the tciitad.'- : f....t nds. 



Central tooth of thfi radula i'1'i. In, ti-. TJ.with a triangular, 



finely dentate cusp: lateral tooth tran 



and a series of fine dentieulation- it> rntiiv h-n^th ; marginal* 



gated, simple. 



Shell turbinated, rather solid, white, grooved 01 riM..-.! spirally; 

 aperture entire, lip simple, undnlatrd. colutm-lhi m-arly -tra 

 Operculum corneous, suhcoix-entric or >uhs|>iral. 



Genus FOSSA Ill's. Phil.. 1M1. 



Shell perforate, subglobose, spirally ribheil. -pin- ratlin- 

 last whorl large ; aperture semicircular, j-ulumrllar inarL'in nearly 

 straight, outer lip rounded, undulated. < Jpnvulum cnc. 

 grooved. 



The nucleus of the shell i< sharp, >ubcylin.lric-al, of several 

 whorls, caducous. 



Animal havin.ir two frontal h-l- 



About fifty living s}>ecies have been enumerated ; there are ibur 

 fossil species, miocene of />'"/"/>'. I-'. \MI :.inn. 



Mm-ni'if/nlfi, AradasiV Ma-'-'ion-. \^\\. i~ a - 

 Section PHASI AM.MA. S. Wood, IM'J. 



No frontal lobes.? Shrll elathrai- 

 Mnliti rrii< -mi and pliocene. 



Clathrella, Recluz, 1864, is a synonym. 



Section ISAPIS, H. & A. Adam-. l- s "l. 



Shell umhilieated, s].itv ! ' lvin K r 



ribs; columella with a small median t.M.th. -.-M. timee obsolete, 

 outer lip crenulated. interiorly grooved. West Indies, 



V. ANOMAI.A, Adams. 



