102 Field Columbian Museum — Zoology, Vol V. 



tractile, its exposed part very small, with a short, fleshy, blunt-like 

 protuberance on each side; gill membranes not connected, free from 

 the isthmus; head entirely covered with scales; 30 scales in a series 

 from snout to origin of dorsal fin ; dorsal fin posterior, its origin 



FlG. 27. CYNODONICHTHYS TENUIS Meek. 



over posterior third of anal; origin of dorsal fin slightly nearer tip 

 of caudal than origin of pectoral fin ; base of dorsal 3 in head ; base of 

 anal 2 ; pectoral 1 Y A ', ventrals very short, t, 1 A m head, their tips nearly 

 reaching anal fin; caudal fin rounded, its first outer rays short, and 

 gradually increasing in length, forming the margins of the fins. 



Color dark brownish, pectoral fins dark; dorsal fin with about 3 

 narrow cross-bars made up of small faint dark spots; lower margin 

 of caudal fin light. 



One specimen only of this species was taken. 



While collecting at El Hule this specimen was taken in one of the 

 early hauls of the seine. I saw it was quite different from any other 

 fish I had collected in Mexico and made an extra effort to secure more 

 of them, but was unable to do so. I also spent one day afterwards 

 collecting at Perez and one at Obispo, but was unable to secure more 

 specimens of this fish. A short siege of fever, and the hard rains 

 made it impossible for me to do further collecting then in that region. 



44. Fundulus Lacepede. 

 Killifishes. 



Fundulus Lacepede, Hist. Nat. Poiss., v, 37, 1803. (Type. Fundulus 

 mudfish Lacepede.) 



Foutiuus Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, 

 ^33- (Type, Fundulus seminolis Girard.) 



Body rather elongate, compressed behind; mouth moderate, the 

 lower jaw projecting; jaws each with two or more series of pointed 

 teeth, usually forming a narrow band; bones of the mandible firmly 

 united ; scales moderate ; gill opening not restricted above ; preopercle 

 preorbital and mandible with mucous pores; dorsal and anal fins 

 similar, small; origin of the dorsal fin either in front of, above, or 



