NO. lO FISHES FROM PERU — HILDEBRAND AND BARTON 3 



of the teeth, which are in a single series in each jaw, liave broad bases, 

 are flattened, and have definite serrations at least on the posterior 

 margins. However, the Talara eel has two small teeth on the median 

 line far back on the roof of the mouth, which are missing in the 

 other specimens. In color the Talara specimen is darker brown than 

 the other specimens, and it has fewer pale spots than the holotype. 

 but more than the paratype, becoming larger on the distal part of 

 the tail than in the other specimens. The differences indicated are 

 regarded as variations within the species. 

 Range. — Northern Peru, from off Mount Organos and from Talara. 



PRIODONOPHIS SERRATIDENS, new species 

 Figure i 



Body with smooth skin, somewhat compressed, its thickness at vent 

 about four-fifths of its depth at same place; tail more strongly com- 

 pressed, tapering to a rather narrow point; length anterior to vent 

 slightly greater than length posterior to vent, i .9 in total length ; head 

 more strongly compressed than body, its width just in front of gill 

 opening equal to about half its depth at the same place, its length 

 anterior to gill opening 8.3 in total length and 4.25 in length anterior 

 to vent; greatest depth (at gill opening) 6.8 in length anterior to 

 vent, 1 .6 in head ; snout moderately robust, rather broader than deep 

 in cross section, 5.1 in head; eye small, 12.2 in head, 2.4 in snout; 

 mouth large horizontal, the gape extending about half its length be- 

 yond middle of eye, 2.25 in head ; lips with small papillae ; upper lip 

 and lower jaw with prominent pores ; teeth in jaws in a single series, 

 definitely compressed, with rather broad bases, and with both margins 

 strongly serrated, none on vomer, though present in a single series far 

 back on shaft (see insert, fig. i) and none on palatines; anterior 

 nostril with a tube about two-thirds length of eye, situated well above 

 margin of lip, posterior nostril a round pit, situated at dorsal edge of 

 snout, a little in advance of vertical from anterior margin of eye ; gill 

 opening an oblique slit, about 1.5 times length of eye; vertical fins 

 very low, especially anteriorly, not incased in thick skin, fully con- 

 fluent around the tail, the origin of dorsal a little in advance of gill 

 opening, its origin to tip of snout 4.2 in length anterior to vent; 

 caudal fin rather broadly rounded. 



General ground color brown ; sides of head with dark brown longi- 

 tudinal stripes, extending on anterior part of body, becoming cross 

 lines and reticulations below and somewhat behind gill opening ; upper 

 surface of head and body everywhere, except on ventral surface of 

 head and trunk, with pale spots, mostly larger than eye, extending 

 more or less on the dorsal and anal fins; dorsal fin with an intra- 



