Figure 4. — CMWBT. A, emerging. B, boarding. C, top beam secured to H-frame. bauling in bottom 

 beam. D, both beams secured. Cylinder attached to middle of top beam is bathykymograph. 



ly unnamed and undescribed genus and at least 

 four undescribed species were taken; these speci- 

 mens have been made available to specialists work- 

 ing on the groups concerned. Sixteen orders of 

 fish and 71 families are represented, including 52 

 species of the order Isospondyli, 51 species of 

 Iniomi, and 37 of Percomorphi. The greatest 

 number of species in a single family was 40 in the 

 Myctophidae. The greatest number of species in 

 a single genus was 12 in Lampanyctu*- (Mycto- 

 phidae) ; the next greatest was 8 in Melam phurx 

 (Melamphaidae). 



About 52,000 fish were taken in the pelagic sur- 

 vey. The order Isospondyli comprised about 56 

 percent of this total, including the numerically 

 most abundant species, Engraulis mordax, which 

 itself was 34' percent of the total number. The 

 Iniomi was the second most abundant order, about 

 38 percent of the total; the family Myctophidae 

 comprised most of this percentage. The mycto- 

 phid genus Lampanyctws (including the subgenus 

 Triphoturus) , was 21 percent of the total, and 

 Lampanyctus (Triphoturus) mexlcanus was the 

 second most abundant species — about 18 percent 



632 



U.S. FISH AND WILDLIFE SERVICE 



