548 



MOLLUSCA THYLUM VI 



Upper Cretaceous of Europe and North 



oval, sometimes with very faint canal 

 America. 



Paramelania Smith. Eesembles the preceding. Living in Lake Tanganyika. 



Fascinella Stache ; Goptostylus Sandb. ; Faunihs Montf ; Hemisinus Swainson. 

 Upper Cretaceous, Eocene and Recent. 



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



Fig. 967. 



Pyrrjulifcra pich- 

 leri (Hoernes). 

 Upper Creta- 

 ceous; Ajka, 

 Hungary. 



Fio. 968. 



Melcmopsla galln-pro- 

 vincialis Math. Upper- 

 most Cretaceous ; Mar- 

 tigues, near Marseilles. 



Fio. 969. 



UManopsis mar- 

 tiniana Fer. Mio- 

 cene ; Nnssdorf, 

 near Vienna. 



Fio. 970. 



Melanopsis (Can- 



thidomus) acanthica Pleurocera tttromhi- 



Neumayr. Upper formis (Scliloth). 



Miocene; Miocic, Wealden ; Oster- 



Balniatia. wakl, Hannover. 



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

 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. 



Ooniobasis Lea ; Anculosa Say {Leptoxis Raf) ; Ptychoshjhis 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. Apertitre anteriorly 



VK: 972. 



Trorhdlin ronnolirina Zitt. 

 Tithonian ; Straiiiberg, Mor- 

 avia. Longitudinal section. 



Fid. 973. 



A, Nerinca defrancci d'Orb. Coral-Rag ; Coulanges sur Yonne. B, N. 

 dilatata d'Orb. Coral-Rag ; Oyoiinax, Ain. C-E, N. hnke,neg(inri I'eters. 

 Tithonian ; Straniberg, Moravia. '','■!/;,. A Vi- £, Longitudinal section. 



