120 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



which is inflected dorsally. At the base of the rostrum is an 

 expanded semi-circular phitc having a radiated surface and a serrated 

 margin. The posterior extremity contains a short slightly curved 

 phragmocone, with remains of thin semi-lunate septa. 



In defining his genus Beloptera., Blainville ' included in it two 

 species, viz. Beloptera sepioidea and B. helemnoidea. Under ordinary 

 circumstances, therefore, we should regard the first-mentioned species 

 as the type of Beloptera, and place Belosepia under the generic 

 synonomy, when another name would have to be given to the group 

 of which B. helemnoidea is the type. There is, however, no necessity 

 for making this alteration, since Blainville himself in a later 

 work^ expressly states that he regards the last-mentioned species 

 (erroneously referred to B. helemnitoidea) as the type of Beloptera. 



Belosepia sepioidea, Blainville. PI. X. Figs. 1-3. 



Os de SceJie, Cuvicr.— Ann. Sci. Nat. Paris, 1824, vol. ii. p. 482, 



pi. 22, figs. 1, 2. 

 Beloptera sepioidea, Blainville. — Man. Malacologie, 1825, p. 622 ; 1827, 



Atlas, pi. xi. fig. 7. 

 Se2na Cuvieri, D'Orbigny. — Ann. Sci. Nat. Paris, 1826, vol. vii. p. 157, 



no)i Deshayes. 

 Beloptera sepioidea, J. de C. Sowerby. — Mineral Conchologv, 1828, 



vol. vi. p. 183, pi. 591, fig. 1. 

 Belosepia Cxivieri, Voltz. — Mem. Soc. Hist. Nat. Strasbourg, 1830, 



vol. i. p. 22, pi. ii. fig. 6. 

 Sepia lo)i(/ispina ] Deshayes. — Coq. Foss. Paris, 1835, vol. ii. p. 757, 



,, longirodris \ pi. ci. figs. 4-6, 10-12. 



Belosepia sepioidea, vars. lo^ifjirostris and lonffispina, Edw. — Mon. Pal. 



Soc. 1849, pp. 29, 30, pi. i. figs. 1«-1/. 

 Belosepia Cuvieri \j^ de C. Shy. -Dixon's -Sussex," 1850, 



„ matmillei. \ j^g jgg jg^ . .^_ g JQ J J 



„ longnpma ^^ ^^^^^ { ^5' 



,, longirostris J v r o ^j 7 



Belosejna sepioidea, Deshayes,— Desc. Anim. sans Vert. 1865, vol. iii. 



p. 617. R. B. Newton. — Syst. List Edwards Coll. 



British Museum, 1891, p. 288. 



Belosepion elongate ; dorsal surface arched, acute posteriorly, 

 expanding anteriorly, covered with prominent, nodular granules 

 arranged in curved lines parallel with the anterior margin ; sides 

 almost vertical, feebly granulated. Rostrum elongated, with ventral 

 surface straight or bent towards the dorsal aspect ; dorsal surface 

 slightly arched and presenting a sharp edge. Callus narrow, com- 

 pressed, and very rugose ; ventral plate situated beneath the rostrum, 

 almost horizontal, but broadly undulating, superior margin nearly 

 semi-circular, posterior margin semi-elliptical, ventral surface of the 



' Man. Malacolopie, 182-5, p. 622. 

 2 Mem. Bclemnites, 1827, p. 111. 



