F.. B. Meek on Actaonide. 91 
Examples :—Acteon cuspidatus and .A. acutus, onenes (Cylind. 
Morr. & eiye.)s eumedciine angulatus and C, alatus, M.& L.; Bulla 
Thorntoni, Brong., (Cyl. M. & L.), omy C. excavatus, “M. & L. Also:.Ae- 
t@on Oliva, Piette. (Mainly sig 2 
Sub-genus GoONIOCYLINDR 5 Mee “4 (Cylindrites, Division B. (part) 
M. & Lyc.) Shell abruptly reat at the summit of the body-whorl ; 
— mena and not rounding in above; spire sunken or a little 
erte 
"Ti ype :—Cylindrites brevis, M. & L."* Also includes, C. cylindricus, M. 
& L.; Acteeon cylindraceus, Geinitz, and Cylindrites (undt.) Sharpe." 
(J urassic and Cretaceous). 
Szcrion 6, 
Genus ACTZZONINA, d’Orbigny. (As restricted.) 
Shell subovate or subfusiform. Spire generally rather pepe but 
usually shorter than the body-whorl, which is long, and sometimes a little 
truncated at the suture above. Surface nearly hic or sometimes 
with revolving striz, very rarely with vertical coste. Aperture narrow, 
rounded a are sinuous below; columella more or less thickened but 
hk! gadis —Chemnitzia carbonaria, Koninck,** (Acteonina, d’Orb.). Also 
Includes Actwonina aoe A, wage isulca es — Sarthacensis, A; 
Franquana, A. Dormoisiana, A. acuta, A. Mileola, A. Hordeum, A. sub- 
andiana, A, Deslongchampeis and ms phere Orbigny. (Carbonit. 
erous to Jurass eashic. 
Sub, genus Trocuacrzontna, Meek. (Acteonina, (sp.) d’Orbigny.) 
Shell turbinate or subglobose, the widest part being above the middle 
of the @ body-whorl. Spire much depressed, sometimes a little attenuate 
ee ee Body-whorl large ventricose, rounding in above. 
Type :— Actwonina ventricosa, d’Orbigny."’ Also includes A. Davoust- 
(ai Tate and Cassis Esparceyensis, d’Arch. (Acteonina, d’Orb.), 
Conc ittel and Gobert describe and a, in the first vol. of the 
Conholgie Journal of Paris, (3d ser. pl. 12, f11) under the name 
riato-sulcata, an interesting little 3 urassic shell which I was 
a inolinea¢ to retain here, as the type of a strongly marked su 
arther comparisons have satisfied me, however, that the angular, or sub- 
eanaliculate < saint of the base of its aperture, excludes it from the 
a Acteonina, and, together with its other characters, place it even in 
family Aplustride, near the genus Bullina, 
Genus EUCONACT.AON, Meek. (Acteonina (part), dOrb. and others.) 
ig , eee Balai obconic, involute. Spire wanting, its place 
the « Occupied by a cavity. Body-whorl composing the entire tract of 
», Sowerb - - 1. 4 
xs Morri ce Mon. sat Ool, wat ,. 101, pl. 8, Ee. 13, 184. 
Potea pop ie 
ph rerinr> rere, a 22, f. 9, ) 
" Pal. Franc, Terr, Jur, vol. 2, p.178, pl. 288, £7, 8. 
