somewhat greater preanal and predorsal length, a slightly shorter caudal peduncle, and longer 

 pectoral fins. This form was not found among the few specimens examined by me. 



Based primarily on the above criterion, specimens answering well to both G. venetus and 

 G. cocco were found in the southeastern Pacific (Fig. 72). However, in these specimens provi- 

 sionally identified as G. cocco, the position of the last perforated scale generally was more in 

 agreement with the criterion given by Bolin than that given by Becker, in that this scale was 

 from 4 lateral line scales before to 2 behind a vertical from the tip of the adipose fin. 



Centrobranchus 



Fowler, 1904 



Gill rakers poorly developed, reduced to a few small protuberances topped by slender 

 spinules. Lateral line undeveloped, no perforated scales. One Pol; 2 Pre, close together on same 

 level and widely separate from AOp. 



The four currently recognized species of Centrobranchus have been delineated by Becker 

 ( 1964a); the following key to species and data have been taken largely from that study. 



Key to species of Centrobranchus 



la. SAO, usually slightly behind VO4 C. andreae 



lb. SAO, over or before VO;, (rarely slightly behind) 2 



2a. Nasal rosette oval; snout length considerably greater than least depth of caudal peduncle. 



Four or 5 AOp over anal base C. choerocephalus 



2b. Nasal rosette round; snout short, about equal to least depth of caudal peduncle 3 



3a. Snout short, equal to or less than least depth of caudal peduncle. Depth of body slightly 



less than 4 times in standard length. Three or 4 AOp over anal base C. brevirostris 



3b. Snout length equal to or slightly greater than least depth of caudal peduncle. Depth of 



body slightly greater than four times in standard length. Three (rarely 2 or 2) AOp over 



anal base C. nigroocellatus 



Centrobranchus andreae 



(Liitken, 1892) 



Fig. 73 — Centrobranchus andreae, male, 62.4 mm. 



Description 



D. 11(10-12); A. 18-19(17-20); P. 12-13 (11-14); AO 6-7 (rarely 5-8) -t- 10-11 (rarely 7-12), 

 total 17 (15-19); vertebrae 38 (37-39). 



87 



