PLATYPODA 



475 



Itfstartris, Link. (Persona, Montf.). Tertiary and Recent. 



lamella, Lain. (Fig. 960). Like Tritonium, but with two opposite varices, wliirh 

 are continuous over all the whorls. Tertiary and Recent. 



Superfamily 4. EACHIGLOSSA. Gray. 



Radula reduced to three teeth or to one tooth in a transverse series. 



These are carnivorous marine forms, which have their initiation in the Mesozoic, 

 become somewhat numerous in the Cretaceous, and form an important element of the 

 Tertiary and Recent faunas. 



Family 1. Columbellidae. Troschel. 



Shell small, ovate to fusiform, covered with epidermis, imperforate. Aperture narrow, 

 canal short. Outer lip denticulated internally, thickened in the middle. 

 Tertiary and Recent. 



The typical genus, Columbella, Lamarck (Fig. 961), attains its 

 maximum distribution in the Tertiary and Recent seas. It is divided 

 into a number of sub-genera. 



Family 2. Buccinidae. Troschel. 



Fio. 961. 



Shell elongate-oval, covered with epidermis. Aperture wide, with Columbetki curta, 

 jthort canal. Outer lip sharp or thickened. Operculum horny. Cre- j^pugy, 'Transyi- 

 taceous to Recent. vania - 



Buccinum, Linn. Inflated, smooth, or transversely ribbed. Spire moderately 

 high ; aperture wide ; canal short, wide, open. Outer lip sharp and thin, inner lip 



somewhat callous. Distributed principally in waters of the more 



northerly zones (B. undatum, Linn.). Fossil in the Crag and 



Pleistocene. 



Cominella, Gray (Fig. 962). Usually spirally ribbed. The last 



whorl somewhat depressed l)eneath the suture, so that the aperture 



forms a small groove 



posteriorly. Outer lip 



sharp or crenate intern- 

 ally. Upper Cretaceous 



to Recent. 



Pseudoliva, Swains. 



(Fig. 963). Like the 

 last, but outer lip with a small basal 

 tooth or notch which corresponds to a 

 groove on the body whorl. Upper Cre- 

 taceous to Recent. 



Pisania, Bivona (Pisanella, v. Kce.nen ; 

 Taurinia, Bellardi). Elongate-ovoid, spire 

 moderately high. Whorls smooth or 

 spirally striated. Outer margin thickened, 

 notched internally. Tertiary and Recent. 

 Pollia, Gray (Cantharus, Bolten ; 

 Tritonidea, Swains.), (Fig. 964). Oval, 

 inflated; spire and aperture of about equal length; surface usually spirally ribbed 

 and transversely folded. Columella often with weak transverse folds ; outer margin 

 thickened, crenate internally. Aperture posteriorly with a short canal. Tertiary 

 and Recent. 



FIG. 90.'. 



( 'ominella cassidaria, 

 A. firaun. Oligocene; 

 Hackenheini, near 

 Alzey. 



Pseudoliva Zitteli, Petho. 

 Upper Cretaceous ; Fruska 

 Gora, Hungary. 



964, 



Pollia snblamta, Bast. 

 ap. Miocene ; Enzes- 

 feld, near Vienna. 



