238 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



vertical fins ; dorsal dusky, with a dark bar ; head without red 5 caudal 

 and anal more or less yellow ; females obscurely marked ; young with 

 diffuse greenish vertical bars. 



Head 3i in length to base of caudal; depth 3^. B. 5; D. 7 or 8; A. 

 10 or 11; "lat. 1. 33; L. transv. 10; L. 3 to 3f. 



San Sebastian River, Florida, where it is abundant, in company with 

 Jordanella Jloridce, Zygonectes rubrifrons, and other Cyprinodonts, the nu- 

 merous types collected by Dr. J. A. Henshall. Some of these in the U. 



5. National Museum are numbered 23449. The largest si)ecies of the 

 genus strongly resembling the preceding, from which it may be known 

 by its dentition, its larger size, and the different coloration. 



6. Ceeatichthys lucens, sp. nov. 



Allied to Ceratichthys biguttatus (Kirt.). 



Body elongate, compressed, the back somewhat elevated from the oc- 

 ciput to the base of dorsal, thence rapidly declined to the long and 

 slender caudal peduncle. Head short, compressed, the cheeks nearly 

 vertical ; interorbital 8X)ace rather broad and flat, somewhat grooved ; 

 eye very large, circular, high up, placed nearly midway of the length of 

 the head ; its diameter about equal to the length of the snout, and 

 scarcely greater than the width of the interorbital space. Preorbital 

 bone large, oblong, conspicuous and silvery ; suborbital bones rather 

 narrow. 



Mouth ratber small, horizontal, the lower jaw included, the edge of 

 the premaxillary below the level of the eye ; the maxillary not reaching 

 to the vertical from the front of the orbit. Barbel quite small. Snout 

 boldly and abruptly decurved much as in C. amblops (Raf.), the tip of 

 the snout thickened, forming a sort of pad. 



Scales moderate, tnm, and brightly silvery. Lateral line decurved in 

 front, thcDce nearly straigU.'; about 16 scales in front of the dorsal, 42 

 in the course of the lateral 'ii^e ; 5 series above and 4 below. Rows of 

 scales along the back converging behind the dorsal where the upper 

 series run out, as in Luxilus coniutus. 



Fins rather higher and more falcate than in Ceratichthys biguttatus; 

 the dorsal fin inserted well forward, directly over or shghtly in advance 

 of base of ventrals. Pectoral fins pointed, not reaching ventrals, the 

 ventrals not reaching the vent. 



Teeth 4-4, hooked, without grinding surface. ' 



Color translucent greenish above; sides and below brilliantly silvery; 

 eye white; cheeks and opercles with a bright silvery lustre; upper fins 

 yellowish ; lower unspotted ; a slight plumbeous lateral shade, but no 

 distinct markings anywhere either in large or small specimens. 



Length of head contained 4^ times in total length to base of caudal j 

 I reatest depth 4 times. 



Dorsal rays, I, 8; anal I, 8. 



Length of largest of typical examples 5J inches. 



