890 [August, 



maculated ; tKe fins are unicolor except the dorsal which has a black spot at 

 its posterior margin. 



D 9. A 8. C 6. I. 7. 6. I. 5. V 6. P 14. 



Leon's Springs, Rio Grande del Norte. 



13. Cyprinodon gibbosus, B. and G. The back forms a very prominent arch 

 in the individuals of both sexes- The nape is often depressed and subconcave. 

 The head is proportionally small, and the eyes large. The back, upper part of 

 sides, head, and dorsal fins, are uniformly bluish black in the male ; beneath 

 golden yellow, and the caudal margined with black ; the anal, ventrals and pec- 

 torals, yellow. The fennale exhibits vertical bars of black on the sides from 

 the head to the caudal fin which is unicolor like the anal, ventrals and pectorals. 

 The dorsal is provided posteriorly with a black spot. 



D 10. A lie 4. I. 8. 7. I. 3. V 5. P 15. 

 Brackish waters of Indianola. 



14. Heterandria AFFiNis, B. and G. Body elongated, subfusiform and com- 

 pressed. Head forming about one-fifth of the entire length. Body yellowish 

 brown above, orange beneath. Fins unicolor, except the caudal which has two 

 narrow bands of black. 



D 6. A 8. C 3. I. 7. 6. I. 2. V 5. P 12. 

 Rio Medina and Rio Salado. 



15. Heterandria nobilis, B. and G. General form much stouter than in the 

 preceding species ; back arched. Head forming the fourth of the entire length. 

 Ground color reddish; margin of scales black. 



D 8. A 7. C 4. I. 7. 7. I. 3. V 6. P 10. 



From Leona and Camanche springs, valley of the Rio Grande del Norte. 



16. Heterandria patrtjelis, B. and G. Body rather elongated, compressed. 

 Head stouter than in H. affinis, though forming the fifth of the entire length. 

 Reddish brown above, yellowish beneath. 



D 5. A 8 C 3. I. 7. 6. I. 2. V 6. P 11. 



Inhabits the Hydrographic basin of the Rio Nueces ; specimens were collected 

 in the Rio Sabinal, Rio Leona and Rio Nueces, and Elm creek. 



17. HETERANDRfA occiDENTALis, B, and G. Body. slcpder } back slightly 

 arched ; head small and conical, forming the fifth of the entire length. Reddish 

 brown above ; reddish yellow beneath. Fins unicolor, of a light yellowish 

 white. The ventral line is marked by a black stripe* A black and heavier 

 line may be observed under the tail, between the posterior margin of the anal 

 rin and the base of the caudal. 



1) <j. A 7. C 4. L 7. 6. L 3. V 6. P 10. 

 Collected in the Rio Santa Crux of the Rio Gila 



Description of Ne.iv Species of Fishes,, coUe-cted ly'Capiains E, B. Marcy, and 



Geo, B. JV['Clella7i, in Arkansas, 



By Spencer F. Baird, and Charles Girard. 



1. PoMoiis BREViCEi'S, B. and G. Body subelliptical, rather short 5 head very 

 short, fore part convex and elevated; peduncle of tail of medium size. The 

 greatest depth is more than half of the length, the caudal fin excluded. The 

 origin of the dorsal fin is in advance of the opercular flap, and is composed of 

 eleven spiny rays and ten soft ones. The origin of the anal is under the first 

 >ott ray o( the dorsal, and contains nine soft and three spiny rays. The pos- 

 terior extremities of these two fins extend a little beyond the middle of the pe- 

 duncle of the tail. The caudal is slightly emar^inated posteriorly, and its 

 angles rounded; it is composed of seventeen fully developed rays and a few ru- 

 dimentary ones. The ventrals inserted behind the base of pectorals, extend by 

 their tips to the anus. 'I'he pectorals, composed of thirteen rays, do not reach 

 juite so far. 



D XI. 10. A III. 9. C 2. I. 8, 7. I. 2. V T 5. P 13. 



