480 



MOLLtJSCA 



SUB- KINGDOM VI 



FIG. 984. 



' Strigatella labratula, 

 Lain. sp. Eocene ; 

 Grignon. 



Strigatella, Swains. (Fig. 984) ; Cylindromitra, Fischer (Cylindra, Schum.) ; Ira- 

 bricaria, Schum. ; Volutomitra, Gray. Tertiary and Recent. 



Lyria, Gray (Fig. 985). Elongate - oval, transversely ribbed. Aperture narrow. 

 Columella anteriorly with two much compressed and very large plications, behind 



(above) which are numerous weaker ones. 

 Outer margin thickened. Tertiary and Recent. 

 Halia, Risso (Priamus, Beck). No columellar 

 folds. Pliocene and Recent. 



Volutilithes, Swains. (Fig. 986). Shell 

 fjisiform, spire elongate -conical ; nucleus small, 

 rising to a more or less acute apex. Whorls 

 costate, typically spinose. Aperture anteriorly 

 with short broad canal ; columellar folds vari- 

 able, several in number, those toward the 

 anterior being generally the most pronounced. 

 Abundant in the Cretaceous, Eocene, and 

 Oligocene ; only one recent species. 



Allied genera and sub -genera : Gosavia, 

 Stol. ; Leioderma, Rostellites, Conrad ; Voluto- 

 derma (Fig. 987), Volutomorpha, Gabb. Cre- 

 taceous. 



Athleta, Conrad. Spire short, body whorl 

 inflated, posteriorly with a row of spinous 

 nodes. Inner lip callous, much expanded ; 

 columella anteriorly with three strong trans- 

 verse folds, behind (above) which follow a few 

 bicormia, weaker ones. Outer margin thickened. Eocene 

 and Miocene. 



Valuta, Linn. (Fig. 988). Shell elongate- 

 oval or fusiform, solid, broad, and with elevated, turbinate, smooth nucleus. Spire 

 short, longitudinally plicate, the folds being 

 elevated into obtuse tubercles 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. 



Sub-genera : Fulgaria, Schum. ; Scapha, Gray 

 (Fig. 988) ; Volutella, d'Orb. ; Aurinia, Adams 

 (Volutifmus, Conrad), etc. 



Musica, Humphrey. Spire short, nucleus 

 small. Aperture narrow, inner lip callous, 

 with numerous transverse folds ; outer margin 

 thickened. Tertiary and Recent. toawvS^eiowata' FlG< m 



Cymbium, Klein (Yetus, Adams ; Melo, d'Orb. Gosau-Cre- Valuta (Scapha) vmricina, 



TT i \ r\ L -r> taceous St Gil<*en Lam. Calcaire Grossier ; 



Humph.). Cretaceous to Recent. Austria Dainery, near Epernay. 



FIG. 985. 



Lyria modesta, A. 

 Braun. Oligocene ; 

 Weinheiin. 



FIG. < 



Volutilithes 

 Lam. Eocene ; Cour- 

 tagnon, near Epernay. 



Family 8. Harpidae. TroscheL 



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

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

 and Recent. 



