SUB-ORDER 1? 



PLATYPODA 



467 



Living species inhabit fresh, or more rarely brackish, waters of Southern Eui"|.. 

 and the warmer zones of Africa, Asia, and America. 



Melania, Lam. (Fig. 917). Shell smooth or spirally striated, or 

 with transverse ribs or nodes. Aperture oval, anteriorly rounded. 

 Upper Jura to Recent. 



Stomatopsis, Stache. Whorls platform-like, with strong trans- 

 verse ribs ; aperture rounded, with entire, thickened, and reflected 

 margins. Lowermost Eocene (Cosina Beds) ; Istria and Dalmatia. 



Pyrgulifera, Meek (Hautkenia, Munier - Chalm.), (Fig. 9 1 8). 

 Shell thick, elongate - oval, with platform - like, transversely 

 ribbed, and spirally striated whorls. Aperture oval, sometimes 

 with very faint canal. Upper Cretaceous of Europe and North 

 America. 



Paramelania, Smith. Eesembles the preceding. Living in 

 Lake Tanganyika. 



Fascinella, Stache ; Coptostylus, Sandb. ; Faunus, Montf. ; Herni- 

 X//M/X, Swainson. Upper Cretaceous, Eocene, and Recent. 



Melanopsis, Fer. (Figs. 919-921). Shell oval to turreted, smooth 

 or ornamented. Base of columella truncated ; aperture with short 

 canal ; inner lip callous. Upper Cretaceous to Recent. Remarkably 

 abundant in Miocene and Pliocene. 



Pleurocera, Raf. (Fig. 922). Like Melania, but aperture with faint canal, and 

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



Ki<;. '.'17. 



Mi-luniii /.'.-/ ,-.". 

 nongt. .V 



Pyrgulifera Pich- 

 hri, Hoernes sp. 

 Upper Creta- 

 ceous ; Ajka, 

 Hungary. 



Mrlnnnpsis gallo-pro- 

 vincialis, Math. Upper- 

 most Cretaceous ; Mar- 



t i.nues, near Marseilles. 



FIG. 920. 

 Melanopsis M<ir- 

 tiniana, Fer. Mio- 

 cene ; Nussdorf, 

 near Vienna. 



Melanopsis (Can- 

 thidomus) acciith /<, 

 Neumayr. Upper 

 Miocene ; Miocic, 

 Dalmatia. 



FID. __. 



Pte*roamttnmbi- 



formis, Schloth. sp. 

 Wealden ; Ostei- 

 wald, Hannover. 



Goniobasis, Lea ; Anculosa, Say (Leptoxis, Raf.) ; Ptychostylus, Sandb. 

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



Wealden. 



Family 16. Nerineidae. Zittel. 



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

 with short canal or shallow notch. Columella and lips with strong folds, continuous 

 throughout the entire length of the spire. Outer lip thin, posteriorly with fissure-like 

 incision, which leaves a small slit-band immediately beneath the suture on all the whorls. 

 Marine. Trias to Cretaceous. 



Aptyxiella, Fisch. (Aptyxis, Zittel non Troschel). Turreted, very slender, im- 

 perforate. Aperture quadrangular; inner and outer lips without folds; cohuuella 

 somewhat thickened. Trias to Upper Jura. 



