CLASS IV 



GASTROPODA 



529 



Subgenera : Sarmatims, Ninclla (Fig. 869), Modclia, and Callopoma Gray ; Senedus 

 Hiuiiphr. ; Batilhis Schum, , etc. 



Collonia Gray (Fig. 870). Like Turbo, but operculum with a thin calcareous layer 

 disposed in a spiral rib. Eocene to Recent. 



Family 8. Phasianellidae Troschel. 



Shell elongated, oval, thin, smooth, lustrous, porcellanous, not 

 nacreous internally, 



ivithout umhilicus. Body 

 whorl large, with oval 

 aperture. Operculum 



calcareous, convex exter- 

 nally. Devonian to 

 Recent. 



Phasianella Lam. 

 {Phasianus Montf.) (Fig. 

 871). With the.jchar- 

 acters of the family. 



Cretaceous to Recent : Turho (Ninclla) parkinsoni 

 , T -r. 1 • Bast. Oligocene ; Uax, near 



perJiaps also raieOZOlC. Bordeaux. 



Fig. sod. 



Fig. STO. 



Collonia'- modcsta 

 Fuchs. Oligocene ; 

 Monte Grunii, near 

 Castel Gomberto, 

 Italy. 



Fig. 871. 



Phasianella gosauiai 

 Zeki'li. Tmonian;Qosau, 

 Austria. 



Family 9. Delphinulidae Fischer. 



Shell turhinate or discoidal, usually thick, nacreous internally, and ornamented 

 externally with spines, ribs or folds. Aperture circular, peristome entire; outer lip 

 usually expanded or thickened. Operculum horny, often strengthened by a thin calcareous 

 outer layer. Silurian to Recent. 



Graspedostoma Lindstrom. Globose, narrowly umbilicate, Avith short spire, and 

 large transversely striated or cancellated body whorl. Inner lip with an alar process 

 at the end of the columella. Silurian. G. elegantulum Lindstrom. 



Grossostoma Morr. and Lye. (Fig. 872). Depressed turbinate, smooth, without 



Fio. S7-2. 



Crossostoma reflexi- 

 lahrnm, (d'Orb.). 

 Middle Lias ; May, 

 Calvados. 



FlG. SV3. 



Liotia (jcrvillci 

 (Deshayes). Calcaire 

 Grossier ; Haute- 

 ville, near Valogne, 

 France. 



Fio. 874. 



Delphinula segregata 

 Heb. et Desl. Callo- 

 vian ; Montreuil - Bel- 

 lay, Maine-et-Loire. 



Fig. 875. 



Delphinula scohina 

 (Brongniart). Oligocene ; 

 Gaas, near Dax, France. 



umbilicus. Spire short, aperture round, narrowed by a callus. Outer lip somewhat 

 reflexed. Trias and Jura. 



Liotia Gray (Fig. 873). Depressed turbinate, with transverse swellings. Aperture 

 thickened by a callous rim. Jura to Recent. 



Delfhinula Lam. {Angaria Bolt.) (Figs. 874, 875). Depressed turbinate, um- 

 bilicate. Whorls scaly, spinous or spirally ornamented. Aperture circular, lip 



without thickening. 

 VOL. I 



Trias to Recent. 



2 M 



