ISerry — Revie\\' of Cephalopod Genera 355 



(iiistriinnii tlie lamellae are cniiical rallier tliau traiis\erscl\- ridge-shaped, they are 

 nut lyiigitiuhnally fulded or crenulate, there are fewer of them, and the marginal 

 membranes so conspicimiisly (le\el()[)e(l in the other forms are here almost or 

 quite lacking. The fins oi both sexes are more like those of kocliii than those of 

 auritum. Close checking with the original descriptions and figures of both these 

 forms will reveal numerous other differences of detail. 



An interesting feature of the present species, which I have not dwelt upon 

 in the diagnosis, is the incipient digitation of the mantle margin near its junction 

 with the nuchal commissure, evidently a rudiment or vestige of the curious 

 arrangement which is pusheil to such an extreme in Scpioloidca. I am not aware 

 that this has been observed in anv other species of Scpiadariiiiii. but the present 

 material indicates that it is a condition easily obscured by inadequate preservation, 

 so too much stress should not be laid upon its apj)arent absence in the tethers. 



.A. full description of this species, with figures, will appear in a forthcoming 

 monograph cm the .^outh .Australian cephalopods. 



Family IDIOSEPl IDAE. 



Sepio-Loliginei, sul)-fam. Idiosepii Steenstrui). iSSi, p. it,;^,. 240 (23, 30). 

 Idiosepiidae b'ischer, 1882, p. 350. 



Appellor, 1898, p. 6J3. 



Naef, 1912, p. 243. 



IDIOSEPIUS Steenstrup, 1881. 



I (Hose pi lis Steenstrup, 1881. p. 219, j^^t,. 23(1, 240 (9, 2^. 26. 30). 

 \'errill, 1881, p. 417 (suggests relationship to Lolk/o). 

 Idiosepioii Fischer, 1882, p. 350. 

 Idioscpiiis Brcx-k, 1884. p. 105-114. 



.'^teenstrup, 1887, p. f)/-/^. I id, i K), 120, 121 (21-26, 70, 73, 74. 73). 

 Micrdti-nthis Ortmami, 1888. p. 648. 

 Idioscpiiis Appellof, 1898, p. 570, with figs. 



Idioscpiiis. the only genus now recognized as belonging to the aberrant 

 faniilv Idiosrpiidac. was originally described by Steenstrup along with Scpia- 

 dariiim about 40 years ago ( i88r, p. 219), and like the latter genus w-as founded 

 on a single species. /. pvgmaeus, based on specimens from the East Indies and 

 Zamboanga in the Philippines. Steenstrup clearly noted the unique features 

 which mark the genus .and which separate it from even the Sepiadarioid group, 

 and -SO placed it in a new sub-family, fdioscpii. of his family Sepio-Loliginei. 



The subsequent historv of tiie groui) is much the same as that of Sepiadariiiiii. 

 and is the result of the efforts of much the same group of investigators. As in 



