TORNATELLIDA. 355 
Operculum, when present, horny, ovate, narrow, composed of 
few whorls. 
Shell spiral, ovate, convolute or involute, spire more or less 
elevated, surface mostly spirally punctated, aperture usually 
high and narrow, truncate or roundish in front, columella solid. 
The genera and species referred to this family are mostly 
fossil. _The arrangement here followed is that of Dr. Stoliczka 
(Pal. Indica, ii, 398), being a modification of the classification 
of Dr. F. B. Meek (Am. Jour. Sci., xxxv, 89, 1863). 
SuBFAMILY TORNATELLINA. 
Shell ovate, aperture anteriorly rounded, sometimes broadly 
effuse, outer lip sharpened at the margin, columellar lip twisted 
and often plicated in front. The recent species operculated. 
AcT#oniINnA, d’Orb, 
Syn.— -Trochactzonina, Meek. Orthostoma, Desh. 
Distr.—30 sp. Carboniferous to Hocene. A. Lorieriana, d’Orb. 
(Ixxxviii, 46). 
Shell oval, elongated, conical or fusiform, with revolving punc- 
tated striz ; aperture long and narrow, widened in front, entire ; 
lip sharp; columella thickened, but without plications. 
EUCONAOTHON, Meek, 1863. (Conactzon, Meek, 1863.) Shell 
thin, obconic, gradually tapering anteriorly, spire either immersed 
or elevated, aperture very long, equally narrow all through, ante- 
riorly rounded, columella slightly thickened, smooth. Distr.— 
Jurassic. A. coneava, d’Orb. (xxxviii, 47°. 
CYLINDRITES, Morr. and Lyc. _(Goniocylindrites, Meek.) Shell 
subeylindrical or ovate, smooth, spire sunken or moderately 
elevated, aperture narrow, very high, anteriorly rounded, sub- 
effuse, columella twisted anteriorly into a distinctly conspicuous 
fold. Distr.—Triassie and. Jurassic. A. cuspidatus, Morris 
(Ixxxviii, 48). 
CYLINDROBULLINA, von Ammon, 1878. Shell small, with ele- 
vated, scalariform spire; columella witha slight fold. Triassic to 
Liassic. A. fragilis, Dunker. 
TornaTina, A. Ad. 
Distr.—24 sp, ~ West. Indies, United States, Mediterranean, 
Philippines, China, Australia. On sandy bottoms, ranging to 
35 fathoms.—ApAms. Fossil, 13 sp. Tertiary... £. coarctata, 
A. Ad. (lxxxvii, 25). 
Shell cylindrical or fusiform, spire conspicuous, apex sinistral, 
suture channeled, columella callous, 1-plaited. 
Animal with a broad, trigonal head, rounded in front; tentac- 
ular lobes triangular, with eyes at their outer bases ; foot short, 
truncated in front.: %, 
