374 DR. A. GTJNTHER ON CENTRAL- AMERICAN FISHES. [NoV. 26, 



scales on the body not very small, cycloid. The dorsal fin commences 

 at the occiput, and terminates near the base of the caudal : the 

 spines are flexible, and much-lower than the soft rays ; the three 

 anterior ones are rather more remote from one another than the 

 following : none of the rays of this or of the other fins are branched. 

 Caudal rounded. The anal is higher posteriorly than anteriorly, 

 about as high as the spinous dorsal. Pectoral rounded, with the 

 middle rays longest, shorter than the head. Ventrals jugular, half as 

 long as the pectoral, with the spine and the outer ray enveloped in a 

 common thick membrane. Dark greyish olive ; head and fins black- 

 ish ; head, base of the pectoral, anterior part of the body, and dorsal 



dotted with white. 



lines. 



Total length 61 



Height of the body 8 



Length of the head 12 



Greatest width of the head 1 1 



Depth of the head 7y 



Length of the caudal fin 10 



— : of the pectoral fin 10|- 



Cremnobates (Blenniid^). 



(Substituted for Auchenopterus, which is preoccupied.) 

 Body moderately elongate, with the scales small or of moderate 

 size. Snout rather short, with the cleft of the mouth of moderate 

 width. A band of small teeth in the jaws ; teeth on the vomer. 

 Two separate dorsals, composed of spines only ; the anterior short, 

 formed by three spines. Ventrals jugular, composed of three rays. 

 Head with tentacles ; gill-opening wide. 



Cremnobates monophthalmus. 



D. 3 I 27. A. ^. V. 3. L. lat. 38. 



A fimbriated superciliary tentacle ; a small one at the nostril and 

 on each side of the nape, both multifid. A black ocellus, edged with 

 white, on the posterior quarter of the dorsal fin. 



Description. — This fish is very similar to Cristiceps argentatus in 

 general habit, but may be readily distinguished by the dorsal fin, 

 which is entirely composed of spines. Head and body are oblong 

 and compressed ; the length of the former is one-fourth of the total, 

 the height of the latter one-sixth. The cleft of the mouth is of 

 moderate width, with the lower jaw slightly prominent, and with the 

 maxillary extending beyond the vertical from the centre of the orbit. 

 The teeth in the outer series are stronger than those in the narrow 

 band behind ; vomerine teeth apparently in a single series ; palatine 

 teeth none. The orbital tentacle is shorter than the eye, with three 

 or four cilise ; the nasal and nuchal tentacles are still shorter. The 

 pectoral is nearly as long as the head, rounded, with the middle rays 

 longest ; ventral slender, somewhat shorter than the pectoral, with 

 the outer ray longest. The first dorsal fin commences in the verti- 



fe 



