48 SPIRULID^. 



AcANTHOTEUTHis, Wagiier, 1839. 



Etym. — Acantha, a spine, and teuthis, a calamary. 



Syn. — Belemnosepia, Desh. ; Belemnoteiithis, Pearce, 1842 ; 

 Kalseno, Miinster, 1836. 



Distr. — 1*1 fossil sp. Oolitic. A. antiquus, Cunn. (xxviii, ^4). 



Animal with ten nearly equal arms with two rows of horny 

 hooks and suckers ; margin of mantle free all around ; flns large, 

 medio-dorsal. Shell a phragmocone like Belemnites, a horny 

 dorsal pen with obscure lateral bands and a thin fibrous rostrum 

 witli two diverging dorsal ridges. 



CoNOTEUTHis, d'Orbiguy, 1842. 

 Diatr. — C. Diipinianus, Orb. (xxviii, 69). Neocomian, France. 

 Phragmocone slightly curved, chambered and siphunculated, 

 Avith an elongated, slender pen. No protecting rostrum. 



Belemnosis, Edwards, 1849. 



Diatr. — B, plicata, Edwards (xxviii, 86). Eocene, 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. 



Etym. — Belos, a dart, and pteron, a wing. 



Syn. — Belopterina, Munier-Chalmas, 1872. Vasseuria, Mimier- 

 Chalmas, 1880. Bayanotevithis, Munier-Chalmas, 18T1. 



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. 



Spirulirostra, d'Orbigny, 1841. 



Dist. — S. Bellardii, d'Orb. (xxix, 81). Tertiar}^ of Turin. 



Phragmocone commencing with a spiral like Spirula, after- 

 wards continuing straight ; external spathose layer produced 

 posteriorly into a long, pointed end. 



Family SPIRULID^. 



Spirula, Lamarck, 1199. 



Syn. — Ammonia, Breyn., 1732. 



Distr.— S 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. 



