CLASS IV 



GASTROPODA 



555 



irregular 



Subgenus : S'consia Gray (Fig. 1005) 

 Upper Cretaceous to Recent. 



Cassis Lam. (Fig. 1006). Shell ovoid, ventricose, having 



„^^j^ varices. Spire short, aperture elongate. Outer 



lip thickened, reflected, usually denticulate in the interior. 

 Inner lip callous, expanded, denticulate, wrinkled or granii- 

 late. Canal very short, broad, sharply recurved, directed 

 uj)ward posteriorly. Tertiary and Recent. 



Family 24. Doliidae Adams. 



Shell thin, inflated. Spire very short, body whorl very 

 large, longitudinally ribbed or cancellated. Aperture ivide, 



oval ; canal straight or curved. Oper- 

 culum absent. Cretaceous to Recent. 



Last whorl with varix ; canal short and straight. 



Fig. 100(5. 



Cassis salmron Lam. Miocene ; 

 Gainfalirn, near Vienna. 



Cretaceous to 



Tonna Briinnich {Dolium Lam.). 

 Spirally ribbed. Outer lip notched 

 internally ; canal short, obliquely directed. 

 Recent. 



Pyrula Lam. {Ficida Swainson) (Fig. 1007). Spirally 

 ribbed, grooved or cancellated. Aperture very wide ; outer liji 

 sharp ; canal long, broad, straight. Lower Cretaceous to 

 Recent ; maximum in Tertiary. 



Family 25. Nyctilochidae Dall. 



Fig. 1007. Shell thick, ovate to fusiform, ivith eindermis. Spire 



Pyrula retimiata (Lam.), moderately high, whorls varicose, aperture ivith thickened outer 



lip, and open, straight or slightly bent canal. Operculum horny, 

 with marginal nucleus. Cretaceous to Recent. 



Miocene ; 



Vienna. 



Grund, 



Oligo- 



Nyctilochus Gistel {Tritonium Link ; 

 Triton, Lotorium Montf.). Spire elon- 

 gated. The varices do not run con- 

 tinuously over more than a few whorls. 

 Columella and inner lip callous or 

 granulated. Outer lip thickened inter- 

 nally and notched. Cretaceous to 

 Recent ; abundant in the Tertiary, 



EtigTjrina Dall (Fig. 1008). 

 cene to Recent. 



Distortrix Link {Personct Montf.). 

 Tertiary and Recent. 



Bursa Bolten {Ranella Lam.) (Fig. 

 1009). Like Nyctilochus, but with two 

 opposite varices, which are continuous 

 over all the whorls. Tertiary and 

 Recent. 



Superfamily 4. RACHIGLOSSA 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. 



Fig. 1008. 



Eugyrina flandrica de 

 Kon. Oligocene ; Wein- 

 lieim, near Alzey. 



Fig. 1009. 



Bursa (Aspa) marip',iiata 

 Brocclii. Miocene ; Grund, near 

 Vienna. 



