SUB-ORDER B PLATYPODA 457 
Pustularia, Koken. Turreted, with groove-like sutures. Whorls flat, with three 
or more spiral rows of nodes. Trias. 
Catosira, Koken. Whorls flat, with transverse ridges. Aperture canaliculate ; 
base with spiral grooves. Trias and Jura. 
Diastoma, Desh. (Fig. 866). Like the last, 
but aperture separated from the body whorl. 
Whorls with transverse folds and spiral striae. 
Cretaceous and Tertiary. 
Mathilda, Semper (Promathilda, Andreae). 
Turreted ; whorls transversely and _ spirally 
striated or ribbed. Aperture with canal. 
Nucleus heterostrophic. Jura to Recent. 
Keilostoma, Desh. (Paryphostoma, Bayan), 
(Fig. 867). Turreted, spirally striated. Outer 
lip with externally thickened margin. Eocene. 
Turbonilla, Risso (Chemnitzia, p.p. dOrb.), 
(Fig. 868). Small, turreted, with heterostrophic 
nucleus. Whorls transversely ribbed or smooth. ae 
Inner lip straight, or occasionally with folds. aN coe i ae 
Tertiary and Recent. Lam. sp. Caleaire Lam.); Caleaire 
Odontostoma, Fleming (Fig. 869); Pyrami- Rede Sr 
della, Lamarck (Fig. 870). Cretaceous to Recent. 
Syrnola, Adams; Eulimella, Fischer. Tertiary and Recent. Palaeoniso, Gemm. 
Trias and Jura. 
The genera Subulites, Conrad (? Polyphemopsis, Portlock), from the Cambrian™ to 
Carboniferous ; Fusispira, Hall, Ordovician ; and Soleniscus, Meek and Worthen, Car- 

Fic. 867. 

Keilostoma turri- 

Fia. 869. 
Fic, 86S Odontostoma pli- Fic. 870. : Fic: a 2 
ee cata, Montf. sp. Pyramidella pli- Buchrysalis fusi- 
Turbonilla rufa, Upper Oligocene ; cosa, Bronn. Mio- formis, Miunst. 
Phil. Crag; Sutton, Nieder-Kaufungen, cene; Niederleis, sp. Trias; St. 
England. near Cassel. Moravia. Cassian, Tyrol. 
boniferous, are characterised by narrow, anteriorly elongated and canaliculate aper- 
tures. They probably form a separate family, in which also should be placed the 
Triassic Huchrysalis, Laube (Fig. 871). 
Superfamily 2. PTENOGLOSSA. Gray. 
Teeth of the radula subulate, numerous, and similar in each transverse row. 
Family 1. Scalariidae. Broderip. 
Shell turreted, usually narrowly wmbilicate. Whorls convex, transversely ribbed or 
striated. Aperture round, with entire peristome.  Operculum horny, paucispiral. 
Marine. Silurian to Recent. 
Holopella, M‘Coy (Aclisina, de Kon.). Slender, turreted ; whorls with fine trans- 
verse striae, sometimes cancellated. Silurian to Carboniferous. 
