CLÄSS IV 



GASTROPODA 



555 



Subgenus : Sconsia Gray (Fig. 1005). Last wliorl with varix ; canal sliort and straight. 

 Upper Cretaceous to Recent. 



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

 irregulär varices. Spire sliort, apertiire elongate. Oiiter 

 lip thickened, refiected, nsually denticiüate in the iiiterior. 

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

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

 upward posteriorly. Tertiary and Recent. 



Fig. 1006. 



Cassis sahuron Lam. Miocene ; 

 Gainfahrn, near Vienna. 



Cretaceous to 



Family 24. Doliidae Adams. 



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

 large, longüudinally ribhed or cancellated. Apertur e wide, 

 oval ; canal straight or curved. Oper- 

 culum ahsent. Cretaceous to Recent. 



Tonna Brünnicli {Bolium Lam.). 

 Spirally ribbed. Outer lip notched 

 internally ; canal short, obliquely directed. 

 Recent. 



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

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

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

 Recent ; maximum in Tertiary. 



Family 25. Nyctilochidae Dali. 



Fig. 1007. Shell thicJc, ovate to fusiform, with epidermis. Spire 



Pyrula reticuiata (Lam.). moderately high, lühorls varicose, aperture ivith thickened outer 

 Vienna, ' ' ^ ^Wi ^^^ open, straight or slightly hent canal. Operculum horny, 



with marginal nucleus. Cretaceous to Recent. 



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. 



Eugyrina Dali (Fig. 1008). Oligo- 

 cene to Recent. 



Distortrix Link {Persona Montf.). 

 Tertiary and Recent. 



Bursa Bolten {Ranella Lam.) (Fig. 

 1009). Like Nyctilochus, but with two 

 opposite varices, whicli are continuous 

 over all the whorls. Tertiary and 

 Recent. 



Fig. 1008. 



Eugyrina flandrica de, IUiih 



Kon. Oligocene ; Wein- Brocclii. 



heim, near Alzey. Vienna. 



Fig. 1009. 



(Aspa) marijin'ita 

 Miocene ; Grund, near 



Superfamily 4. RACHIGLOSSA Gray. 



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



These are carnivorous marine fornis, which have their Initiation in the Mesozoic, 

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

 Tertiary and Recent faunas. 



