GILBERT AND ST ARKS — FISHES OF PANAMA BAY 173 



base of upper pectoral rays. The iiiuler side of the head is coarsely spotted, usually 

 with two parallel cross-bars. Males are much darker, sometimes nearly uniformly 

 blackish, with all the fins black. 



Six spines have been erroneously attributed to this species. Seven are 

 present in all specimens examined by us, including the one obtained by the 

 Hopkins Expedition to Mazatlan (see Jordan, 181)5, p. 497, PI. LIX). The normal 

 fin-formula is dorsal VII, 12; anal 10. In ten specimens counted, one had 11 dorsal 

 rays and one had 13; in all others, the normal formula was found. The first dorsal 

 spine is constantly produced into a filament, which usually fails to reach the middle 

 of the soft dorsal, but extends beyond the first dorsal ray. 



The dentition has not been correctly described. There is in the upper jaw a 

 moderate band of villiform teeth, along the front of which is a series of strong curved 

 canines, which decrease in size regularly toward the angles of the mouth. Behind 

 the band, in the middle of the jaw, are four much slenderer canines, directed back- 

 ward, all evenly spaced. In the lower jaw, the teeth are in a villiform band, with 

 an outer and an inner series of strong canines. Laterally, these all give place to a 

 single close-set series of teeth, which are but little larger than those of the villiform 

 band. The canines of the inner series increase in size laterally and are directed 

 obliquely backward. The outer canines are stronger than the inner, and decrease in 

 size laterally. 



The scales are large and strongly ctenoid, covering the body behind the ver- 

 tical from the second to fourth ray of second dorsal. There are about 16 cross-series 

 of scales, the anterior series containing about 12 scales each. 



The head is contained 3j in the length to base of caudal; ^ to 4| in the total 

 length. 



314. Enypnias seminudus {Gi'mther). 



Plate XXIX, Fig. 53. 



Fifteen specimens were secured of this rare species, which had not been reported 

 since the discovery of the types in 1861. Examination of our material shows that 

 the species is widely separated from typical Oobius, and also from Garmannia, pos- 

 sessing the following characters: 



The dorsal spines are constantly 7 in number instead of 6, the number 

 assigned in current descriptions. There is a pair of thick barbels on the chin, each 

 of which springs laterally from the edge of the median frenum of the lower lip. 

 The body is much more completely scaled than is the case with Garmannia jiaradoxa. 

 The belly is naked, and has continuous with it a naked .strip extending up into the 

 axil of the pectoral fin. The head and nape are also naked, a narrow naked strip 

 extending backward along base of spinous dorsal. Otherwise, the scales cover the 

 body, the scaly area narrowing anteriorly behind the base of the pectoral fin. Ante- 

 riorly, the scales are very small and are arranged irregularly. They increase in size 

 posteriorly, and are there inserted in regular series. There arc about 50 or 60 scales 

 in a line along middle of sides. 



(23. December 30, 1903. 



