452 FISHES FROM GALAPAGOS AND PANAMA GILBERT. 



24. Gobiesox zebra Jordan & Gilbert. 



Two youug specimens, agreeing in all respects with the original de- 

 scription, except the tin formula, the dorsal having six and the anal five 

 rays. The dark cross-bars are evident. Duncan Island. 



25. Labrosomus delalandi Cuv, & Val, 



One large specimen, 6i inches long, from Albemarle Island. 



Dialommus gen. nov. (Blenniidw) 



Teeth conic, strong, in a narrow baud in the front of both jaws, this 

 narrowing to a single series laterally -, outer teeth enlarged in both 

 jaws. Teeth on vomer in a single series 5 palatines smooth. 



A single slender tentacle above orbits, and one on each side of nape. 



Body with moderate cycloid scales ; lateral line high iu front, de- 

 clining behind pectoral fins, not strongly developed, evident ou a few 

 scales near head, the remainder of its course traceable by occasional 

 pores on bases of scales, or by their notched margins. 



Dorsal beginning on the nape, its anterior five- sevenths composed of 

 slender flexible spines, the remainder of soft rays, unbranched. Anal 

 without spines. Caudal distinct, rounded. Veutrals well developed, 1,3. 



Eyes as in Anableps, the cornea divided by an oblique pigmented 

 band into an anterior lower and a posterior upper half. 



(Type, Dialommus fuscus sp. nov.) 



26. Dialommus fuscus sp. nov. 



Elongate, slender, scarcely tapering. Head short, transversely evenly 

 rounded, with very short, blunt, decurved snout. Width of head 

 greater than its depth, and more than two-thirds its length. Mouth 

 horizontal, at lower outline of snout, the maxillary nearly reaching ver- 

 tical from i^osterior margin of orbit, 2| in head. Teeth strong, conical, 

 the outer series enlarged in both jaws, a narrow band of villiform teeth 

 behind the outer series. Vomer with a single series. Palatines tooth- 

 less. 



Ej^es large, round, closely approximated, their diameter greater than 

 length of snout, twice the width of interorbital space, 3^ in head. 



Gill membranes very widely joined, free from isthmus. No hook on 

 inner edge of shoulder girdle. 



Head, 5 in length ; depth 6 to 7. D. XXY, 13 or 14. A. I, 28. 

 Lat. 1. 52. 



Dorsal fin beginning on the nape, over front of opercle, its spines 

 slender and flexible, much lower than soft rays. Height of anterior 

 and middle spines about equal, one-third length of head, the posterior 

 spines shortened, about half that length. Height of soft rays one-half 

 head. 



