CLASS IV 



GASTROPODA 



529 



Snhgenom -.Sarmaticus, Ninella (Fig. 869), Modelia, aud Callopoma Gray ; Henectus 

 Humphr. ; Batillus ^c\\\\m. ^ die. "^ 



Gollonia Gray (Fig. 870). Like Turho, but operciilum witli a thin calcareous layer 

 disposed in a spiral rib. Eoceiie to Recent. 



Family 8. Phasianellidae Trosc.liel. 



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

 nacreous internally, 



loithout umhilicus. Body 

 lühorl large, with oval 

 aperture. Opercuhim 



calcareous, convex exter- 

 nally. Devonian to 

 Recent. 



Phasianella Lam. 

 (Phasianns Montf.) (Fig. 

 871). With the.jchar- 

 acters of tlie family. 

 Cretaceous to Recent ; 

 pcrhaps also Paleozoic. 



Fig. 869. 



Turho (Ninella) parlcitisoni 

 Bast. Oligocene ; Dax, near 

 Bordeaux. 



Fig. 870. 



Collonia- modcda 

 Fuchs. Oligocene ; 

 Monte Gninii, near 

 Castel Goniberto, 

 Italy. 



Fig. 871. 



Phasianella gosauica 

 Zekeli. Turonian;Qosau, 

 Austria. 



Family 9. Delphinulidae Fischer. 



Shell turbinate er discoidal, usually thich, nacreous internally, and ornamented 

 externally ivith spines, rihs or folds. Aperture circular, peristome entire ; outer lip 

 usually expanded or thichened. OperciUum horny, often strengthened by a thin calcareous 

 outer layer. Silurian to Recent. 



Graspedostoma Lindström. Globose, narrowly umbilicate, with short spire, and 

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

 at tlie end of the columella. Silurian. G. elegantulum Lindström. 



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



Fig. 872. 



Crossostoina reflexi- 

 läbrum (d'Orb.). 

 Middle Lias ; May, 

 Calvados. 



Fig. 873. 



Liotia ffervillei 

 (Desliayes). Calcaire 

 Grossier ; Haute- 

 ville, near Valogne, 

 F'rance. 



Fig. 874. 



Delphinula segregata 

 Heb. et Desl. Callo- 

 vian ; Montreuil - Bel- 

 lay, Maine-et-Loire. 



Fig. 875. 



Delphinula scobina 

 (Brongniart). Oligocene ; 

 Gaas, near Dax, France. 



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

 reflexed. Trias and Jura. 



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

 thickened by a callous rim. Jura to Recent. 



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

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

 without thickening. Trias to Recent. 



VOL. I 2 M 



