GILBEET AND STARKS — FISHES OF PANAMA BAY 

 Measurevients in Hundredths of Length without Caudal. 



187 



Length to base of caudal in mm 



Length of head 



Greatest width of head 



Lengfth of snout 



Diameter of eyeball 



Interorbital width 



Length of maxillary 



Greatest depth of body 



Depth of caudal peduncle 



Snout to first dorsal spine 



Base of second dorsal (to base of last ray) 



Snout to front of anal 



Base of anal (to base of last ray) 



Length of caudal 



Length of pectoral (from middle of axil)... 

 Length of ventral (outer ray) 



332. Thalassophryne dowi Jordan & Gilbert. 



This species seems to be rarely taken. A single specimen was obtained by 

 us, 150 mm. long. The only others known are the three types from Pnnta Arenas, 

 Costa Rica, and two specimens dredged by the Albatross in the Bay of Panama. 



The lower half of the body is whitish, unmarked; the dorsal portion is blackish, relieved by 

 the white lateral line and by a few irregular blotches of white, which are most numerous toward the 

 middle of the sides. The head is blackish above and on sides, very finely marbled with gray. The 

 lower lip and the front of the' lower jaw are similarly marked; the gular membrane is slightly dusky; 

 the under side of the head otherwise white. The eyes are seen with difficulty, being colored like the 

 surrounding area. The anal is white, e.xcept some of the posterior rays, which are margined with 

 black. The basal half of the dorsal is white or grayish, sharply contrasting with the black marginal 

 half. The terminal half of caudal is jet-black, the basal half white, blotched more or less with brown. 

 The ventrals are white; the pectorals white, marbled with brown on their basal portion. Teeth in 

 premaxillaries small, in two series, the front tooth of the outer series on each side a strong conical 

 canine. Sides of mandible with a single series of strong canines, which increase in size backward to 

 the eighth or ninth, then suddenly diminish. On the front of the mandible, are two series of similar 

 teeth. The vomer contains twelve canines, increasing in size laterally. The palatine teeth are in a 

 single series, about twelve in number on each side, large and small teeth regularly alternating in the 

 series. 



The head is contained 3J to 4 times in the length. It is cuboid in shape, with vertical cheeks, 

 and very oblique mouth; in appearance resembling Astroscopus. Greatest depth of head three-fourths 

 its greatest width. 



