A REVIEW OF THF. CEPHALOPOD GENERA 

 SEPIOLOIDEA, SEPIADARIUM, and IDIOSEPIUS. 



Bv S. STILLMAN Hl'RRV, Rkdi.ands, California. 



Charts lo. n, and Text Figs. 64-67. 



TiiF, receipt, a short time since, of some interesting material of the cephalopod 

 genera, Scf^ioloidca. Sepiudariinn. ami Idiosepsius, from the Board of Governors 

 of tile Public Library, Museum. ;ind Art Gallery of South Australia, has caused 

 nie to review the literature of these aberrant sepioliform squids as critically as 

 possible. (Jne of the genera, Idiuscpius. is new to the Australian fauna, where 

 it is represented by a hitherto unnoticed species. .\ South Australian Sep'ui- 

 dariuiii also appears to be new. Pending the appearance of the more complete 

 report in which they, with other species, are to have detailed treatment, siiort 

 preliminary diagnoses of both species are here ottered, together with a brief 

 rcA'iew of the previously descrilicd forms of similar affinities, whicli it is hoped 

 will [M'ove convenient to other students, even though this portion of the paper 

 perforce contains little that is truly original. Tentative keys to the species are 

 likewise added. 



Note. — The figures following authors' names refer to the bibliograjjiiy, tliose 

 within brackets to the pagination of reprints. 



F.-xMiLv SEPIOr.lDAE. 



St;R-F.\MIL\' .SKI'I.\n.\kIIN.\E. 



Sepio-Loliginei, sub fam. Sepiadarii Steenstrup, 1881, p. 233, 239 (23, 29). 



Sepiadariidae Fischer, 1882, p. 350. 



Sepioladae, sul.i-fam. Sepiadarii Appellof, 1898, p. 623. 



Sepiolidae, sub-fam. Sepiadarinae Naef, 1912, p. 246, 248. 



The earliest discovered meml)er of this group was the "Scpiola lineolata" 

 Ouov and Gaimard (1832). The verv peculiar features bv which this unic|ue 

 creattire diiifers from the true Scpiola were recognized a few years later, and it 

 was made liy d'Orbignv ("1839). the type of his genus Seploloidea. 



For manv vears nothing of special consequence was added to our knowledge 

 of the group, until in 1881 the genus Scpiadariinii Steenstrup was founded for 

 the accomniorlaticm of another peculiar small sepioliform squid, specimens of 



