NEW COTTID FISHES BOLIN 



31 



ular series, the anterior pores of which are paired ; no single median 

 pore on symphysis. 



Origin of first dorsal on a perpendicular about midway between 

 upper end of gill opening and posterior end of subopercle ("oper- 

 cular flap") ; base of fin 2.4 (2.2-2.8) in head; fin of 7 (7-8) spines; 

 first two with approximate bases, usually subequal in length and 

 longest, being 3.4 (2.9-3.7) in head; third spine shorter than second 

 or fourth, forming a marked notch in fin outline. Second dorsal 

 separated from first by a wide interspace 1.6 (1.1-2.1) in orbit; 

 base of fin 1.5 (1.3-1.6) in head; fin of 11 (11-12) rays; first ray 

 2.0 (1.6-2.9) in fourth, fifth, or sixth ray, which is longest, being 

 2.3 (2.1-2.7) in head. Origin of anal under second, third, or fourth 

 dorsal ray; its posterior end under the second, third, or fourth ray 

 from end of second dorsal; base of fin 2.3 (2.1-2.6) in head; fin of 

 8 (6-9) rays; first ray 1.5 (1.1-2.2) in fourth or fifth ray, which is 



FiGDUE 6. — Atopoeottus tribranchius, new species, holotype (U.S.N.M. no. 102105). 



longest, being 2.7 (2.4-2.9) in head. Pectoral base 2.7 (2.5-2.9) in 

 head; fin of 19 (17-20) rays; longest ray 1.3 (1.2-1.5) in head, 

 extending to somewhere between anus and anal origin. Base of 

 pelvics immediately behind lower end of pectoral base; fins rather 

 widely separated, the distance between them roughly equal to dis- 

 tance from pelvic base to lower end of pectoral base; inner ray the 

 longer; length of fin 1.9 (1.8-2.3) in head, extending 0.5 (0.4-0.6) 

 distance to anal origin. Caudal truncate with 7 (6-8) split rays, its 

 length 1.6 (1.4-1.8) in head. Anus in front of anal origin at a 

 distance about equal to diameter of pupil; located just anterior to 

 the base of a very short, bluntly conical, genital papilla, which in 

 the male is free, in the female surrounded by and partly embedded 

 in a folded fringe of skin. 



Anterior part of lateral line armed with 4 (3-6) deeply embedded 

 scales; each scale in the form of a short simple tube pierced by 

 large fenestrae; posteriorly the lateral line is continued to base of 

 caudal by 27 to 29 minute pores, very difficult to distinguish ; their 

 position and number may readily be determined if congealed mucus 



