CLASS IV 



GASTROPODA 



561 



and very large plications, behind (above) which are numerous weaker ones. Outer 

 margiai thickened. Tertiary and Recent. 



Ampulla Bolten (Halia Risso ; Priavius Beck). No columellar folds. Pliocene and 

 Recent. 



Volutilithes Swains. (Figs. 1035-36). Shell fusiform, spire elongate-conical; proto- 

 conch small, rising to a more or less acute apex. Whorls costate, typically spinose. 

 Aperture anteriorly with short broad canal ; columellar folds variable, several in 

 number, those toward the anterior being generally the most pronounced. Abundant 

 in the Cretaceous, Eocene and Oligocene. 



Allied genera : Gosavia Stol.; Leioderma and Bostellites Conrad ; Liopeplum Dall ; 

 Volutoderma (Fig. 1037) and Volutomorpha Gabb. Cretaceous. 



Athleta Conrad. Spire short, body whorl inflated, posteriorly with a row of 



Fi(i. 1034. 



Lyria modeda 

 A.Braun. Oligo- 

 cene ; Weinheiin. 



Fia. 1035. 



Volutilithes bicorona 

 (Lam.). Eocene; Cour- 

 tagiion, near Epeinay. 



Fig. 1036. 



Volutilithes innriciMis Lam. 

 Calcaire Qrossier ; Dameiy, 

 near Epernay. 



Fig. 1037. 



Volutoderma elon- 

 fjitia d'Orb. Gosau- 

 Cretaceous ; St. Gil- 

 sen, Austria. 



spinous nodes. Inner lip callous, much expanded ; columella anteriorly with three 

 strong transverse folds, behind (above) which follow a few weaker ones. Outer 

 margin thickened. Miocene and Pliocene. 



Hcafliella Swains. Shell in this genus is elongate-oval or fusiform, solid, l)road, and 

 with elevated, turbinate, smooth protoconch. Spire short, longitudinally plicate, the 

 folds being elevated into obtuse tu].)ercles on the base of the whorls. Aperture narrow, 

 canaliculate behind and broad in front ; inner margin often covered by a thin callus. 

 Columella carrying many plaits, four or five of which are prominent, the remainder 

 much smaller. Tertiary and Recent. 



Subgenera: Fulgoraria Schum. ; Scapha Gray; Zidona Adams; {Volutella d'Orb.); 

 Aurinia Adams {Volutifusus Conrad) ; CariceUa Conrad ; Adclomelon and Eucymba Dall, etc. 



Valuta Linn. Spire short, protoconch small. Aperture narrow, inner lip callous, 

 with numerous transverse folds ; outer margin thickened. Tertiary and Recent. 

 Melo Humphr. {Gymhiuvi pars, Bolten). Recent. 



Family 8. Harpidae Troschel. 



Spire depressed ; body ivhorl inflated, with sharp, uniformly spaced transverse ribs. 

 Aperture wide, with short broad canal. Inner lip callous. Operculum absent. Tertiary 

 and Recent. 



VOL. I 2 



