548 



MOLLUSCA 



THYLUM VI 



oval, sometimes with very faint canal. Upper Cretaceous of Europe and North 

 America, 



Paramelania Sniitli. Resembles tlie preceding, Living in Lake Tanganyika. 



Fascinella Stäche ; Goptostylus Sandb. ; Faunus Montf. ; Hemisinus Swainson. 

 Upper Cretaceous, Eocene and Recent. 



Melanopsis Fer. (Figs. 968-970). Shell oval to turreted, smooth or ornamented. 



Fig. 967. 



PyrguUfera pich- 

 leri (Hoernes). 

 Upper Creta- 

 ceous; Ajka, 

 Hungary. 



Fig. 968. 



MeloMopsis gdllo-pro- 

 vincialisMsLth. Upper- 

 most Cretaceous ; Mar- 

 tigues, near Marseilles. 



Melanopsis mar- 

 tiniana Fer. Mio- 

 cene ; Nussdorf, 

 near Vienna. 



Fig. 970. 



Melanopsis {Can- 

 thidomus) acanthica 

 Neumayr. Upper 

 Miocene; Miocic, 

 Dalmatia. 



Fig. 971. 



Pleurocera stfomhi- 

 formis (Schloth). 

 Wealden ; Oster- 

 wald, Hannover. 



Upper 



Base of columella trimcated ; aperture with short canal ; inner lip callous. 

 Cretaceous to Recent. Remarkably abundant in the Miocene and Pliocene. 



Pleurocera Raf. (Fig. 971). Like Melania, but aperture with faint canal, and 

 outer lip sinuous. Cretaceous to Recent ; occurs only in North America. 



Goniohasis Lea ; Änculosa Say {Leptoxis Raf.) ; Ptychostylus Sandb. Wealden. 

 The first two occur Tertiary and Recent in North America only. 



Family 16. Nerineidae Zittel. 

 Shell turreted, pyramidal or ovate, perforate or imperforate. Aperture anteriorly 



A B C D 



Fio. 97: 



Trochalia consohrina Zitt. 

 Tithonian ; Stramberg, Mor- 

 avia. Longitudinal section. 



Fig. 973. 



A, Nerinea defrancei d'Orb. Coral-Rag ; Coulanges sur Yonne. B, N. 

 (Hkitata d'Orb. Coral-Rag ; Oyonnax, Ain. C-E, N. hoheneqgrri Peters. 

 Tithonian ; Stramberg, Moravia. (', 2/,,. j), Vi- E, Longitudinal section. 



