To compare these with the Atlantic form, we examined 19 examples from Anadyr 

 Gulf and Chukchi Sea and 20 from the Barents Sea. A comparison of measurements 

 and meristic data show a great similarity in tJie east and western forms. E amples 

 from the Bering Sea differ chiefly in a rougher and broader body; head with 21.0-25.4% 

 of SL (average 24.9%). In the Barents Sea material (17. 1-22,5, average 21 . 1%). The 

 weakly developed or obsolescent pores on interorbital and nuchal plates are well 

 developed m the western examples. They have fewer spines on lateral row of 

 plates and a larger size and a few other characters which do not serve to separate 

 the forms from the Pacific Ocean and Barents Sea as distinct. 



Our examples from 50 to 70 mm. 



D6-7 A 5-7 P 14 (15) Dorsal plates 34-38 (in 19 examples). 



Measurements in percent of SL (average of 19 examples)^/. Preanal 59.0 

 (57.2), predorsal 59.2 (57.2), preventral 28.4 (27.2), interorbital 4.6 (5.0) at 

 front edge of eye, head 25.6 (25.2), head width 24.9 (21.1), greatest body depth 

 16.3(15.3), depth of caudal peduncle 3.7 (3.4), eye 7.0 (7.3), snout 5.6 (5.8), 

 pectoral fin length 26 . 6 (25 . 9), ventral length 10 . 7 (11 . 6) . 



Family Cyclopteridae 



60 . Eumicrotremus orbis Gunther 



Very common in north Pacific Ocean, occuring north to Chukchi Peninsula . 

 Tlie northernmost records, between St. Lawrence Id. and Chukchi Peninsula 

 (DALNEVOSTOTCHNIK 1933, Sta. 25) where it is not uncommon. Absent in 

 Japan Sea. Found on hard facies (rocky and gravel). Very seldom on sand. 

 Depths of 20 to 75 meters . Temperature tolerance wide, often considerably 

 above and below zero. Our examples (from 10 stations) were found in temperatures 

 ranging from 2.0 to -1.7° Young examples are found at higher temperatures 

 (to 3.2°). On August 26, 1932, 35 young were found between Chukchi Peninsula 

 and St. Lawrence Id. They measured 29 to 40 mm (average 34 mm). Young were 

 found at the same period in Providence Bay (in Emma Bay) . Adult examples measure 

 55 to 75 mm; no halfgrown were found in the summer. In a 57 mm example we 

 distinguished two winter rings in the otoliths. 



DVI-VII, 11-12 A 10-11 P 24-26. 



1/ 



In parentheses are the range of Barents Sea material, averaging up to 20 

 examples (No. 1804, 10451, 10452, 10453, 11132, 11371 and 17786 of Zool. 

 Mus. Akad. Sci. SSSR). 



37 



