SUB-ORDER B PLATYPODA 465 
Lithoglyphus, Ziegl. (Fig. 908). Globose or ovate, with short spire; rather thick 
and solid. Aperture large, obliquely oval; inner lip thickened. 
Tertiary and Recent; Europe. Similar forms, Somatogyrus, Gill, 
and Flumincola, Stimpson, occur in North America. There are 
other related genera in South-Eastern Asia and South America. 

Fia. 908. 
Lithoglyphus fuscus, Family 11. Rissoidae. Troschel. 
Ziegler. Upper Mio- 
cene; Malino, West 
ene D Shell small, thick, turbinate to turreted, usually ribbed or spirally 
Slavonia. ’ b b 
striated, rarely smooth. Aperture oval, angular posteriorly, often with 
anterior canal. Operculum 
horny, paucispiral. Jura to A B 
Recent. 
Rissoina, WVOrb. (Fig. 
909). Turreted, transversely 
ribbed, rarely smooth ; outer 

: Fic. 910. 
lip arcuate, generally Fic. 909. ae : y 
L - A, Rissoa turbinata, Lam. sp. 
thickened 3 aperture some- A, Rissoina amoena, Zitt. Tithon- Oligocene ; Weinheim, near 
« é ~ nee ian; Stramberg, Moravia. B, R. Alzey. B, R. (Alvania) Mon- 
what notched or effuse at decussata, Montf. Miocene; Steina- tagui, Payr. Miocene; Steina- 
the base. Dogger to Recent ; brunn, near Vienna. brunn, near Vienna. 
mainly Tertiary. 
Rissoa, Frém. (Fig. 910). Turreted, transversely ribbed or cancellated, aperture 
entire below. Jura to Recent. 
Family 12. Turritellidae. Gray. 
Shell turreted, with high acuminate spire. Whorls numerous, usually spirally ribbed 
or striated. Aperture oval, round or quadrangular, sometimes with faint anterior canal. 
Outer lip thin, peristome discontinuous. Operculum horny, 
multispiral. Marine. Trias to Recent. 
Turritella, Lam. (Figs. 911, 912). Spire very high ; 
aperture oval or rounded quadrilateral; outer lip thin, 
excavated behind, and slightly produced in front. Trias 
to Recent; maximum in Tertiary. The older Mesozoic 
species are usually 
small. 
Sub-genera: /e- 
salia, Gray (Fig. 912). 
Like the last, but 
aperture with shallow 
canal, and _ twisted 
inner lip. Tertiary 
to Recent. 
Protoma, Baird 
(Proto, p.p. Defr.). 
Aperture oval, an- 

Fie. 911. ps teriorly with canal- 
ee ‘ aa £ Ee aR 
A, Turritella turris, Bast. (T. EO Fic. 913 like contraction, 
terebra, Ziet. non Linn.). Mio- Turritella (Mesalia) vest’: which is surrounded 
cene Molasse ; Ermingen, near multisulcata, Lam. Glauconia Kefersteini, externally by a thick 
Ulm. B, T. imbricataria, Lam. Eocene; Calcaire Goldf. Middle Cre- ewellinc: Tertiary 
Caleaire Grossier; Grignon, near Grossier; Grignon, taceous; Dreistiitten, SWIMS. ertlary 
Paris. near Paris. near Wiener-Neust. and Recent. Je 
cathedralis, Brgt. 
Glauconia, Giebel (Omphalia, Zekeli ; Casstope, Coq.), (Fig. 913). Thick-shelled, 
conical to turreted, narrowly umbilicate. Whorls spirally ribbed, rarely smooth. 
VOL. I 2H 
