SOLARITID®. 219 
from Solarium very desirable. Of many of the palsozoic Stra- 
parolli the opercula are known, and they very much resemble 
those of Torinia, being thick and composed of numerous lamellar 
volutions. 
[MACLUREA, Emmons. Shell discoidal, sinistral, flattened 
above, rounded below ; surface smooth or transversely striated. 
Probably more nearly related to Bellerophontide and Haliotide, 
in the vicinity of which it will be more fully described.  S. 
magna, Lesueur (Ixv, 10). } 
scHIzostoMA, Bronn. Shell dextral or sinistral, planorbiform, 
the whorls flattened or convex; aperture triangular or transverse, 
the margins sinuous above and below, uniting in a produced 
point at the periphery. S. Puzosii, Vern. (Ixv, 11). 
C&LOCENTRUS, Zittel. Shell low conical, widely umbilicated, 
with rounded or angular whorls, having one or two series of 
tubercles or hollow spines; aperture round, with entire lip. 
Devonian to Trias. S. Goldfussi, d’Arch. 
EUOMPHALOPTERIS, Roemer. Shell low conical, widely and 
deeply umbilicated ; periphery seamed, with fine radial channels. 
Operculum shelly, concentrically striated and swollen externally, 
showing spiral whorls internally. S. alatus, His. U. Silurian. 
[RAPHISTOMA, Hall. (Helicotoma, Salter.) Shell lenticular 
or orbicular, whorls flattened with a carination above ; umbilicus 
moderate; outer lip with slight sinus at the keel. S. striatus, 
Hall. See p. 223. ] 
Heticocryptus, d’Orb. 
Distr.—H. pusillus, d’Orb. (Ixv, 12). Corallien. 
Shell depressed orbicular, volutions on the same plane; the 
outer one nearly embracing the others, so that it shows a small 
depressed spire above, and a narrow umbilicus below. 
Stoliezka places this genus near Rotella; it is perhaps as nearly 
related to that genus as to the Solariide. 
ADEORBIS, 8S. Wood. 
Distr.—10 sp. West Indies, China. Low-water to 60 fms. 
Fossil, 5 sp. Eur. A. subcarinatus, Mont. (Ixv, 13). 
Shell depressed orbicular, widely umbilicated; whorls not 
numerous, smooth or striate, the last sometimes angular; aper- 
ture rounded, the outer lip arcuated, simple, sharp. Operculum 
shelly, subspiral. 
OMALAXIS, Desh. 
Distr.—O. supranitida, Wood (Ixv, 14). 
Shell subdiscoidal, whorls distinctly carinate, peristome not 
continuous. Operculum elevated, multispiral. 
Homawoeyra, Jeffreys. 
Syn.—Omalogyra, Jeffreys. Ammonicerina, Costa. 
