CEPHALOPODA. 29 
The specific characters are taken from the rostrum, the callus, and the fold. These 
parts, however, are of secondary importance only, and would vary in form considerably, 
not only with the age, but probably with the sex of the animal. Distinctions founded 
upon them, therefore, must necessarily be somewhat vague and uncertain ; and, in fact, 
M. Deshayes, from not attaching sufficient importance to changes resulting from age 
or other circumstances, has proposed three distinct species, viz. Belosepia longispina, 
B. longirostris, and B. Blainvillii, on remains which, as well as those of the B. Cuvieri (of 
Deshayes), M. d’Orbigny considers to be varieties of the same species attributable to age. 
Four well-defined species are known at present, viz. Ist, B. sepioidea (De Blainy.), 
consisting of S. longispina, 8. longirostris, and 8. Blaimvilhi (Desh.) ; 2d, B. compressa 
(De Blainv.); 3d, B. Cuvieri (Desh.), which I consider to be the B. Owenii of Sowerby ; 
and 4th, B. brevispina (Sowerby). With the exception of the B. compressa, which 
has not yet been found in England, they all occur in the eocene strata of this country. 
The first three species are found in the Paris basin, and the B. Cuvieri has also been 
found in the tertiary deposits of Belgium. 
No. 1. BELOSEPIA SEPIOIDEA. De Blainv. Tab. I, fig. 1 a—. 
BELOPTERA SEPIOIDEA; De Blainv. 1825. Mal. add. et correct. p. 621, tab. 11, fig. 7. 
Serra Cuviert; D’Orb. 1825. Tab. Méth. de la Classe Ceph. p. 67. 
BELOPTERA SEPIOIDEA ; De Blainv. 1827. Mém. sur les Bélem. p. 110, tab. 1, fig. 2, 2a, 26. 
— — Sowerby. 1829. Min. Con. vol. vi, p. 183, tab. 591, fig. 1 
Betosepria Cuviert; Voltz. 1830. Obs. sur les Bélem. p. 22, tab. 2, fig. 6a—g. 
Srpra Cuviert; Galeotti. 1837. Mém. sur la Constit. Géogn. de la Proy. de Brabant, p. 140. 
— tLoneIsptna; Desh. 1837. Foss. des Eny. de Paris, p. 757, tab. 101, fig. 4-6. 
— LONGTIROSTRIS; 35 5 p- 758, tab. 101, fig. 10-12. 
— Buarnvitir; Li a a Af fig. 13-15. 
— Cvuviert; Bronn. 1837. Letheea Geognostica, p. 1127, tab. 42, fig. 19 a—e. 
BELOPTERA LONGIROSTRUM; Morris. 1843. Cat. of Brit. Foss. p. 178. 
SEPIA LoNGrRostRis ; Pictet. 1845. Traité élém. de Paléont. vol. ii, p. 315. 
— LONGISPINA; ss es f % 
— Burarvini; 3 3s 3 
— SEPIOIDEA; D’Orb. 1845-7. Moll. viv. et fos. vol. i, p. 269. 
Betosgrra Cuviert; J. D. C. Sowerby. 1849. Dixon’s Geol. Hist. of Bracklesham, Selsey, 
and Bognor, &c., p. 109, tab. 9, fig. lla. 
—_ LONGIROSTRIS ; 39 35 p. 109, tab. 9, fig. 15. 
_— LONGISPINA ; 3 $ p- 109, tab. 9, fig. 12. 
— BLAINVILLII ; 3 3 p. 109, tab. 9, figs. 16, 17. 
Non Serra Cuvrert; Desh. Foss. des Env. de Paris, p- 758, tab. 101, figs. 7-9. 
B. rostro elongato, crasso, acuto, recto aut plus minusve arcuato ; lamind ventrali 
crassa, profunde radiatim sulcatd, in margine posteriori denticulatd ; callo dorsali pro- 
Sunde et irregulariter rugoso, deorsum producto aut erecto. 
