GILBERT AND ST ARKS — FISHES OF PANAMA BAY lio 



base of ventrals 3 its distance from front of anal. Anal fin very lonjj, its I>;lsc 1 ■[ in heail, its longest 

 ray \ head. Distance between dorsals 3J in length. Adijxjse tin lung, iiighest about o[)i)Osite the 

 middle, « itli a short almost vertical free posterior margin. Its vertical height is 3J in its length, which 

 is more than twice the distance from adipose fin to rudimentary caudal rays, greater than the base of the 

 first dorsal, anil eijual to half the length of the head. Caudal fin with broad lobes, the lower 

 rounded; the upjier mutilated in the type, but evidently acute and longer than the lower. 



Color |iuri)lish above, more bluish anteriorly; the Icjwer parts silvery, coarsely punctait- with 

 brown. Fins all blackish, e.xcept the lower surface of the jxiired fins. 



35. Galeichthys guatemalensis (Giinther). 



Tliis .species was not seen by the authors. Recorded by Giinther (1868, 

 p. 393) from Panama; by Boulenger (1899, p. 2) from Rio Lara, Darien. 



36. Galeichthys dasycephalus {Giinther). 



This species was occasionally seen; eleven specimens were preserved, all of 

 which are females. 



It answers well the description of Giinther (1804 a, p. 157), and of Jordan 

 and Gilbert* (1882 b, page ol), except that the head is constantly longer, l to 4|, 

 in length, and the dorsal spine is contained 11 instead of 11 times in head. The anal 

 contains 21 rays, including the rudiments. The top of the head is constantly much 

 rougher than in G. longicephn/its, although exhibiting much variation in this respect. 

 The fontanel groove reaches base of occipital process in all of the specimens taken. 



37. Galeichthys longicephalus (Eigcnmann d- Eigenmann). 



Taken occasionally; eight specimens were preserved, all of which are males. 



There is little variation in the sculpturing of the head, which is either en- 

 tirely smooth, invested with thick skin, or minutely roughened by a few scattered 

 points. None of our specimens have the plates roughly granulated, as in G. dasy- 

 cephalus. 



The head is very constant in length, 3j, 3s, 3|, 3|, 3i, 3|, 31 and 34 times 

 respectively in distance from tip of snout to base of caudal. The maxillary barbel 

 reaches to base of pectoral spine, or to the end of its ba.sal fourth. The outer mental 

 barbels are variable, sometimes not reaching gill-opening, more often slightly beyond 

 it. The eyes vary in length, and equal their distance from hinder end or middle of 

 posterior nostril, and about half their distance from tip of snout. The width of 

 mouth about equals the length of snout, 2,i to 31 in head. In the description of the 

 type, the width of mouth should doubtless stand 3i, not 2i, in head. The distance 

 from the tip of snout to front of dorsal is contained 2| to 2i in the length; the inter- 

 space between dorsals 3| to 4. 



The color of the upper part is brown, sometimes continued down <iv.r thr 



' Dr. .Jordan has kindly re-examined the specimens here referred to, collected bj- (.ilbort at I'auama ou a 

 previous expedition, and states that the head measures 4J (uot i\) in length to base of caudal. 



