122 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



J. de C. Sby., is oharacterized priucipally by the direction of its 

 rostrum, an nuiraportant feature, and one wliich docs not entitle it to 

 rank liiiiher tlian an extreme form of li. Oiveni. liatlicr rare. 



Formation. — Eracklesham Beds. Localities. — Bracklesham Bay and 

 Bramshaw. 



» 

 Belosepia Blainvillei, Dcshaycs. 



Sepia Blainvillei, Desh. — Coq. Foss. Paris, 1835, vol. ii. p. 758, 



pi. ci. figs. 13-15. 

 Belosepia sepioidea, var. Blainvillei, Edwards. — Mon. Pal. Soc. 1849, 



p. 29, pi. i. figs. l.'/-l/. 

 Belosepia Blainvillei, J. do C. Sby.— Dixon's "Sussex," 1850, pp. 109, 



193, pi. ix. tigs. 16, 17. Desh. — Desc. Anim. sans Yert. 



18G5, vol. iii. p. 616. R. B. Newton. — Syst. List Edwards 



Coll. British Museum, 1891, p. 287. 



Although Edwards regarded this merely as a variety of B. sepioidea, 

 there seem to be good grounds for its separation on account of the more 

 massive structure and the greater width and ellipticity of the dorsal 

 surface. The slit at the extremity of the rostrum alluded to by some 

 authors appears to be due to erosion, which has removed the outer 

 surface and revealed part of the internal structure. Rather rare. 



For/nations and Localities. — Bracklesham Beds : Bracklesham Bay. 

 London Clay : Sheppey and Highgate Tunnel. 



Family BELOPTERID^E. 



Genus BELOPTERA, BlainviUe. 



Man. Malacologic, 1825, pp. 621, 622. Mem. Belemnites, 1827, 

 p. 111. 



Type. — Beloptera helcmnoidea, Blainv. (reference as above). 



Characterized by the possession of more or less salient lateral 

 expansions, and by having an entire conical and chambered cavity, 

 joined to a terminal rostrum; dorsal region convex, ventral concave; 

 siphon ventral. 



It differs primarily from Belosepia by the presence of the lateral 

 expansions, by its proportionately deeper and more obtuse rostrum, 

 and by the absence of a ventral plate. The septa are relatively 

 closer together and not so strongly arched. 



Beloptera belemxoidea, BlainviUe. 



Beloptera helemnoidea, Blainv. — Man. Malacologie, 1825, p. 622; 

 1827, Atlas, pi. xi. fig. 8. 



Beloptera helemnitoidea, Blainv. — Mem. Belemnites, 1827, p. Ill, 

 pi. i. fig. 3. J. de C. Sby.— Mineral Conchology, 1828, 

 vol vi. p. 183, pi. 591, fig. 3. Desh.— Coq. Foss. Paris, 

 1835, vol. ii. p. 761, pi. c. figs. 4-6. Edw.— Mon. Pal. 



