538 



MOLLUSCA 



PHYLUM VI 



Carboniferous ; Fihsisinra Hall, Ordovician ; and Soleniscus Meek and Wortlien, 



Fio. 917. 



Tii.rbo7iilla rufa 

 Phil. Crag; Sutton, 

 England. 



Fir:. 918. 

 Odostomin pit- 

 cata (Montf.). 

 Upper Oligocene ; 

 Kinder- Kaufuiigen, 

 near Cassel. 



Fk;. 919. 



PyraviiiJclIa pli- 

 cosa Bronn. Mio- 

 cene ; Niederleis, 

 Moravia. 



Firs. 920. 



Euchrysalis fusi- 

 formis (Minister). 

 Keuper ; St. Cas- 

 sian, Tyrol. 



Carboniferous, are cliaracterised by narrow, anteriorly elongated and canaliculate aper- 

 tures. They probably form a separate family, in which also should be placed the 

 Triassic Euchrysalis Laube (Fig. 920). 



Superfamily 2. PTENOGLOSSA Gray. 



Teeth of the radula suhulatc, numerotis and similar in each transverse row. 



Family 1. Epitoniidae, novum (Scalariidae Broderip). 



Shell turreted, usually narrowly umbilicate. JFJiorls convex, transversely ribbed or 

 striated. Aperture round, with entire peristome. Operculum horny, paucis2oiral. 

 Marine. Silurian to Recent. 



Holopella M'Coy (Aclisina de Kon.). Slender, turreted ; whorls with fine trans- 

 verse striae, sometimes cancellated. Silurian to Carboniferous. 



Gallonema Hall {Isonema Meek and Worth.). Turreted, oval to 

 globose ; whorls covered with lamellate transverse ribs ; aperture 

 circular. Silurian and Devonian. 



Scoliostoma Braun. Devonian. Ghilocyclus Bronn {Gochlearia 

 Braun) ; Ventricaria and Batycles Koken. Trias. 



Epitoni'um Bolten {Scalaria Lam. ; Scala Klein ; Cirsotrema 

 Morch) (Fig. 921). Turreted; whorls strongly arched, with trans- 

 verse ribs, and often also spirally striated. Aperture round, outer 

 lip sometimes thickened. Trias to Recent. Many suljgenera. 



Family 2. 



Fid. 921. 



Sadariaiumeiiom '^^«^^ depressed conical, 



Brocehi. Miocene; nacreous layer. Whorls 

 angular ; operculum horny 

 spiral. The protoconch is 

 Marine. Cretaceous to 



Solariidae Chenu. 

 deeply and broadly ^imbilicate, without 



Baden, near Vienna. 



or calcareous 



heterostrophic. 



Recent. 



The Solariidae exhibit some resem- 

 blance to the Euomphalidae, from which 



they are distinguished principally by the -g.^^^ 932. 



heterostrophic protoconch. solarium simplex 



Solarium Lam. (Architectonica Bolten) Bronn. Miocene; 



(Figs. 922, 923). Aperture quadrilateral; Niederleis, Morava. 



Jura to Recent. 



Fio. 923. 



Sdlarium hymeriei Ryckholt. 

 Tourtia (Cenomanian) ; Tour- 

 nay, Belgium. 



operculum horny ; umbilical angle notched or sharp. Jura to Recent. A number 

 of Mesozoic forms confused with this genus probably belong to Euompihalus. 



Torinia Gray. Tertiary and Recent. Bifrontia Desh. {Omalaxis Desh.). Eocene. 



