310 ART. 2.— H. MATSUMOTO : 



family is that the radial shield and genital plate of the same side 

 of a radius articulate with each other always by means of two 

 articular condyles and one articular pit. 



Revision of Ophioconis, s. ext. 



In my opinion, Ophioconis as hitherto understood is a very 

 heterogeneous genus and is divisible into many natural groups, 

 each of which is quite compact and worthy of forming a distinct 

 genus. In treating of Ophioconis diastata and papillata, Claek^^ 

 expresses a serious doubt as to the systematic position of Ophio- 

 conis s. ext., and remarks that, he will " not be surprised if 

 some of the species now placed in Ophioconis, really belong in the 

 Ophiacanthidce, while others are placed in the Ophiodermatidœ.'" 

 Kœhler'' also says that, " les 0. cupida, permixta, cincta et 

 grandisquama forment, dans le genre Ophioconis, un groupe à part 

 et qui offre une physionomie différente de celle des autres Ophio- 

 conis y Both authors are right in their views. Claek's species 

 are, in my opinion, referable to Ophiolimna, while the species 

 mentioned above by Kœhler as forming a separate group are to 

 be included in Ophiurodon Matsumoto. A third atypical group of 

 Ophioconis is represented by 0. miliaria Lyman, 1878, and j^wZver?^- 

 lenta Lymak, 1879, which I wish to refer to Ophiuroconis Matsu- 

 moto, while a fourth is represented by Ophioconis indica Kœhlee, 

 1898, for which however I do not dare to propose a new generic 

 name, because I have no specimens of it. Thus the genuine 

 Ophioconis includes only two Mediterranean species, viz. 0. forhesii 

 (Hellee, 1862) and hremspina Ludwig, 1880. The new sub- 



1) Bull. U.S. Nat. Mus., LXXV, 1911, p. 28. 



2) Exp. Siboga, XLV, Et. 2, 1905, p. IR. 



