CLASS IV 



GASTEOPODA 



Eimella Agassiz {Isopleura Meek) (Fig. 996). Surface cancellated, 

 with tliickened margin, entire or a 



crenulated. Upper Cretaceous to Re- 

 cent. 



Gablj. Spire wholly 

 hidden. 



553 

 Outer lip 



Orthaulax 

 involute and 

 Antilles. 



Oligocene 



Fig. 996. 



Family 20. 

 Columbellariidae 



Fischer. 



Shell thick, elongated 



oval, loith short conical ^U Rimella fismrella (Lam.). 



, , ■ 77 Calcaire Grossier ; Damery, 



spire, ana large, spirally nearEpernay. j:,i;.hartoncnsis 



ribbed, frequenthl cancel- (Sowb.). Calcaire Grossier; 



' •' ^ •> Grignon, near Pans. 



lated body whorl. Aper- 

 ture narrow, anteriorly -with short canal, and pios- 

 teriorly ivith a canal directed^ obliquely outtvards. 

 Inner lip callous, outer lip often thickened, denti- 

 culated or somewhat reflected outwardly. Jura and 

 Cretaceous. 



Pig. 995. 



Hippochrcnes inurrMsoni Desli. Calcaire 

 Gro.ssier ; Damery, near Bpernay. 



Fig. 997. 



Columbellaria coral- 

 Una (Quenst.). 



Pig. 998. 

 Zitteliu crassissima 



Coral -Rag; Nat- (Zitt.). Titlionian ; 

 tlieiiii. Stramberg. 



Fig. 999. 



Pctersia costata 

 Gemm. Titlionian ; 

 Palermo. 



Columbellaria RoUe (Fig. 997). Surface covered with numerous spiral ribs, 

 sometimes cancellated. Aperture long and narrow, broadening somewhat anteriorly. 

 Outer lip denticulated internally, not thickened, somewhat reflected. Anterior and 

 posterior canals short. Upper Jura. 



Zittelia Gemm. (Fig. 998). Like the last, but aperture very narrow or cleft-like. 

 Outer lip much thickened in the middle. Titlionian. 



Golumbellina d'Orb. Cretaceous. Petersia Gemm. (Fig. 999). 

 Tithonian. 



Family 21. Cypraeidae Gray. Cowries. 



Shell ovate, convolute. Spire shoii, nearly or completely covered in 

 the adult by the very large body whorl. Aperture of equal length with 

 the shell, narrotv, anteriorly and posteriorly produced in a tisually short 

 canal. Outer lip inflected. Operculum toanting. Upper Jura to 

 Recent. 



Fig. 1000. 



Cypraea suhexcisa 

 A. Braun. Oligo- 

 cene ; Weinheini, 

 near Alzey. 



Recent Cypraeidae of which about 210 species are known, 

 inhabit principally the warmer seas. They are often remarkable for 

 their beautiful coloration, and sometimes attain considerable size. Jurassic species are 

 sparse ; Tertiary ones rather more abundant. 



Cypraea Linn. (Fig. 1000). Ovoid, ventricose, enamelled, smooth, lirate or 



