410 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



Tail slender, its least depth and width slightly less than two-thirds 

 diameter of eye; maxillary ending under anterior edge of pupU, with 

 a single terminal barbel less in length than diameter of pupil; lower 

 jaw slightly shorter than upper, a series of four very mmute and 

 nearly invisible barbels along each ramus; no barbels apparent below 

 cheeks; a series of very small ones on branehiostegals; gill membranes 

 miited, joined to isthmus, but forming a very shght fold across it; 

 teeth in both jaws in narrow bands, a transverse series on vomer, and 

 a short row on each palatine; a row of four or five very distinct small 

 spines on upper surface of eyeballs; a small terminal plate on snout, 

 its lower edge serrate; two pairs of sharp spines on tip of snout; 

 a high and sharp ridge above eye ending posteriorly in a strong spine, 

 beginning with a smaller one; four series of spines on dorsal surface 

 of head, inner ones of two large spines each, separated by a deep occL 

 pital pit from uppennost series on body; outer series of lower spines 

 continuing as second body ridge but interrupted by lateral line at 

 angle of giU opening; ridge along suborbital region continued by 

 broad-based spmes, last of which forms fifth and uppermost of spines 

 on edge of preopercle; interorbital space deeply concave. 



Uppermost and lowermost pairs of body ridges uniting 5 scales 

 posterior to second dorsal and anal to form a dorsal and ventral 

 double ridge on the tail; first ridges with 27 spines as far back as 

 their union, with 8 posterior to it; second ridges with 36; third with 

 35; fourth with 30 to their union and 9 beyond; latter ridges with 

 slightly smaller spines, especially on breast, where there is a median 

 series of 5 small ones. 



First dorsal inserted opposite seventh scale of first ridge; space 

 between dorsals equal to 5 scales of first ridge; anal 2 scales in 

 advance of insertion of second dorsal; ventrals extending well 

 beyond vent, 7f in body; pectorals reaching to below tenth scale 

 of first ridge, caudal 1^ in head. 



Color pattern indistinct, apparently four or five transverse irreg- 

 ular bands on body, first below first dorsal, second across first rays 

 of second dorsal; third across last rays of same; fourth behind 

 junction of first and fourth pairs of ridges; pectorals distally dark, 

 tipped narrowly with white; caudal similar, both with incomplete 

 cross stripes of dark at base; dorsals and anal with traces of narrow 

 dark stripes. 



{Asperoculis, rough eye). 



This is apparently the first record of Agonopsis from the east coast 

 of South America, and is the second species to be described in the 

 genus. The other species is found on the western coast of South 

 America, and perhaps in Patagonia. The present species differs 

 from Jenyns's description and figure of the type of AspidopJionis 



