2. FITZROYIA. 307 



ray is below the end of the dorsal. Mandible about as long as the 

 eye. Uniform greenish-olive (in specimens preserved in spirits), 

 shining silvery towards the belly. A silvery band runs along the 

 lower edge of the prseorbital and the lower margin of the orbit, to 

 the upper end of the gill-opening. 



America. 

 a-e. Females, from 2 to 5 inches long. From the Collection of 

 Haslar Hospital. 



10. Cyprinodon parvus. 



Baird Sf Girard, Ninth Smithson. Report, 1855, p. 345. 

 D. 10. A. 10. V. 6. L. transv. 8. 

 Form elongated ; head less than one-fourth of the total length 

 (with the caudal) ; eye one-third of the length of the head. Colo- 

 ration plain. {Baird.) 



Very small. Long Island. 



11. Cyprinodon bovinus. 



Baird 8f Girard, Proc. Acad. Nat. Sc. Philad. 1853, p. 389, and in 

 U. S. 8f Mex. Bound. Ichthyol. p. 67, pi. 37. figs. 12-18. 



D. 9. A. 8. 



The height of the body is contained from twice and one-sixth to 

 twice and one-half in the total length (without caudal), the length 

 of the head thrice. The diameter of the eye is one-fourth of the 

 length of the head. Sexual differences as in C. variegatus. The 

 origin of the dorsal fin is midway between the extremity of the 

 snout and the root of the caudal, rather behind, than in advance of, 

 the vertical from the root of the ventral. Colours as in C. varie- 

 gatus. (B. 6f O.) 



Texas. 



2. FITZROYIA. 



Lebias, sp., Jenyns. 



In the present state of our knowledge, this genus would appear 

 to differ from Cyprinodon in having the tricuspid teeth arranged in 

 several series. 



I name it in memory of the late Admiral Fitzroy, the commander 

 of the expedition during which this fish was discovered. 



Montevideo. 



1. Fitzroyla multidentata. 



Lebias multidentata, Jenyns, Voy. Beagle, Fish. p. 117, pi. 22. fig. 3. 



D. 9. A. 9. V. 6. L. lat. 32. L. transv. 8. 



The height of the body is more than the length of the head, 

 which is one-fifth of the entire length; jaws nearly equal, the 

 upper one very protractile. There is, behind the front row of tri- 

 cuspid teeth, a band of smaller teeth above and below, all of which 



x2 



