48 SPIRULID A. 
ACANTHOTEUTHIS, Wagner, 1839. 
EHtym.—Acantha, a spine, and teuthis, a calamary. 
Syn.—Belemnosepia, Desh.; Belemnoteuthis, Pearce, 1842 ; 
Kaleeno, Munster, 1836. 
Distr.—11 fossil sp. Oolitic. A. antiquus, Cunn. (xxviii, 74). 
Animal with ten nearly equal arms with two rows of horny 
hooks and suckers; margin of mantle free all around; fins large, 
medio-dorsal. Shell a phragmocone like Belemnites, a horny 
dorsal pen with obscure lateral bands and a thin fibrous rostrum 
with two diverging dorsal ridges. 
ConoreEutuis, d’Orbigny, 1842. 
Distr.— C. Dupinianus, Orb. (xxviii, 69). Neocomian, France. 
Phragmocone slightly curved, chambered and siphunculated, 
with an elongated, slender pen. No protecting rostrum. 
BeLEeMnNosis, Edwards, 1849. 
Distr.—B. plicata, Edwards (xxviii, 86). Hocene, London, 
Phragmocone straight or slightly curved ; rostrum rather 
long, thickened dorsally and obtuse at the hinder end, with a 
ventral opening. 
BELopTERA (Deshayes), Blainv., 1825. 
Htym.—Belos, a dart, and pteron, a wing. 
Syn.—Belopterina, Munier-Chalmas, 1879. Vasseuria, Munier- 
Chalmas, 1880. Bayanoteuthis, Munier-Chalmas, 1871. 
Distr.—4 fossil species. Eocene of Paris and Bracklesham. 
B. belemnitoides, Blainv. (xxviii, 80). 
Shell straight, rostrum sometimes winged on the sides, bluntly 
beaked at the hinder end. 
SprRuLIROSTRA, d’Orbigny, 1841. 
Dist.—S. Bellardii, d’Orb. (xxix, 81). Tertiary of Turin. 
Phragmocone commencing with a spiral like Spirula, after- 
wards continuing straight; external spathose layer produced 
posteriorly into a long, pointed end. 
Famity SPIRULID A. 
SpiruLa, Lamarck, 1799. 
Syn.—Ammonia, Breyn., 1732. 
Distr.—3 species, all tropical seas. S. Peronii, Lam. (xxvii, 
51-53). 
Body oblong, with minute terminal fins. Mantle supported 
by a cervical and two ventral ridges and grooves. Arms with 
six rows of very minute cups. Tentacles elongated. Funnel 
valved. 
