BELOTEUTHIS, PHYLLOTEUTHIS. PTILOTEUTHIS. 155 



nacreous layer. So indestructible is this fossil ink that it is yet 

 capable of use as Sepia. Nine species are found in the upper 

 lias of Wurtemburg, Calvados and Lyme Regis. 



B. LATA, Orb. PL 65, fig. 226. Wurtemburg. 



(Vnus BELOTEUTHIS, Minister. 



Minister described six species, which d'Orbigny afterwards 

 recognized as varieties only, of a single form. 



B. SUBCOSTATA, Munst. PI. 65, lig. 227- 



Upper lias, Wurtemburg. 



(ii-nus PHYLLOTEUTHIS, Mt-ek and Haydcn. 



This genus is founded on an impression of the expanded part 

 of a gladius in a mass of rock : it was evidently thin, and as no 

 part of its substance remains, is supposed to have been corneous 

 in texture. It looks very like Beloteuthis. 



PH. SUBOVATA, M. and H. PI. 65, fig. 228. 



Upper cretaceous, Moreau R., Dakota. 



Genus PTILOTETJTHIS, Gabb. 



KloiiiLrMt.e. sub-ovate, very thin, anterior end broadly angulated, 

 no mid-rib ; slipper either minute or wanting. Surface marked 

 by numerous, irregular, small wrinkles, which radiate back- 

 wards and outwards, partly from the anterior end, and partly 

 from an imaginary median line. 



P. FOLIATUS, Gabb. PL 105. Neocomian, California. 



Family Y. SEPIOLID^E. 



Genus SEPIOLA, Leach. 



* Body and head smooth beneath, cartilage of mantle narrow, linear, oblong. 



Typical. 

 f The sessile arms with two alternating rows of cups to their ends,. 



S. SEPIOLA, Linn. PL 65, figs. 229-237. 



Body oblong, smooth, rounded behind, flesh-color with blotches 

 and spots of dark purple, paler ventrally ; fins leaf-like, rounded, 

 dorsal, and subcentral as to the length of the body; arms short, 

 the lateral ones longest ; the suckers of the ventral arms are 



