b PROCEEDINGS OF THE NATIONAL MUSEUM vol. 71 



ARTEDIELLUS DYDYMOVI Soldatov (1915) 



Artediellus dydymom Soldatov, Ann. Mus. Zool. St. Petersbourg, vol. 20, 



1915, pp. 157-161, fig. 1. 

 D. VII-VIII, 11-13; A. 11-12; P. 19-24; L. lat. 26-33. 



This species was described by Professor Soldatov and can be easily 

 distinguished by the slender body, the presence of four praeopercular 

 spines and of two large round bony tubercles on the occiput directed 

 upwards. 



Only one specimen has been added to our collection since this 

 species was described. It is 74.3 mm. long and differs by having 26 

 pores in the lateral line and by a lower development of pores and of 

 cutaneous cirri on the top of the head. It may perhaps constitute 

 a special Bering Sea subspecies as it was found in this sea (57° 31' 

 N., 163° 17.5' E., 54 fathoms). 



Geographical distribution. — Artediellus dydy7novi is widely dis- 

 tributed in the North Japanese Sea from the Peter the Great Bay to 

 the Nevelskoy Strait and the mouth of the Amoor River. In the Ok- 

 hotsk Sea it is also distributed from the Aniva Bay in the south to 

 Ayan in the northern part of this sea. Our specimen shows that it is 

 found also in the western part of Bering Sea. 



ARTEDIELLUS SCHMmTI Soldatov (1915) 



Artediellus pacificus (part) Schmidt, Pisces Mar. Orient. Imp. Ross., 1904, 



pp. 101-103. 

 Artediellus schmldti Soldatov, Ann. Mus. Zool. St. Petersbourg, vol. 20, 1910. 



pp. 160-161, fig. 2. 

 D. VII-VIII, 11-13; A. 10-12; P. 20-23; L. lat. 25-30. 



This species can be distinguished from A. dydrjmovi Soldatov by 

 the presence of 4 round bony tubercles on the occiput, of 4 well- 

 developed praeopercular spines and of a more or less developed 

 denticle on the upper praeopercular spine. But, if we take into 

 consideration that the first pair of tubercles is developed from the 

 enlarged supraocular rims and that in some specimens of Artediellus 

 dydymom we find the traces of such enlarged bony ridges fused to a 

 kind of tubercle, it will be seen that the difference between both 

 very nearly allied species is not considerable. It is possible that 

 this species maj^ be regarded only as a southern subspecies of 

 Artediellus dydymovi Soldatov, but we have not yet material enough 

 to settle this question. 



Geographical distribution. — This species is now known only from 

 the Aniva Bay (South Sakhalin). 



