7. HAPLOcniLus. 315 



? Zygonectes tenellus, Girard, Proc. Acad. Nat. Sc. Thilad. 1850, p. 60. 

 Zygonectes piilchellus, Girard, Proc. Acad. Nat. Sc. Philad. 1859, 

 p. 113. 



D. 9 (8). A. 11-12 (10). V. 6. L. lat. 34. L. transv. 11-12. 



The height of the body is two-ninths of the total length (without 

 caudal), the length of the head one-fourth. Head low, depressed, 

 and rather elongate, with the snout produced, the lower jaw scarcely 

 projecting beyond the upper ; mandible a little longer than the eye. 

 The width of the interorbital space (which is quite flat) is a little 

 more than one-half of the length of the head. The diameter of the 

 eye is much less than the length of the snout, one-half of the width 

 of the interorbital space, and contained thrice and two-thirds in the 

 length of the head. The origin of the dorsal fin is midway between 

 the extremity of the caudal and the orbit, and corresponds to the 

 twenty-second scale of the lateral line. Pectoral fin extending to the 

 ventral; ventral fin reaching the vent in males, and terminating before 

 it in females. Origin of the anal in advance of that of the dorsal. 

 Brownish or brownish olive, with a black band rimning from the 

 snout through the eye to the middle of the base of the caudal. Back 

 with three or four series of black dots. 



The male has the hinder part of the dorsal and anal fins somewhat 

 more elongate than the female. In the female the anterior anal rays 

 are, with their base, within the sexual opening, which, however, is 

 not prolonged into a tube. In the yomig the upper and lower mar- 

 gins of the lateral band are denticulated, instead of forming a straight 

 well-defined Une. 



Southern States of North America. 

 a-c. Male and females, 3 inches long. From Mr. Parnell's Collection. 

 d. Young. From Mr. Parnell's Collection. D. 8. A. 10. 



L. Agassiz mentions the names of about eight species allied to 

 H. jpitlcheUus {Zijgonedes), Sillim. Amer. Journ. 1854, xvii. p. 353 ; 

 but as the author has omitted to properly characterize them, none of 

 the subsequent writers were enabled to avail themselves of those 

 names. 



11. Haplochilus aureus. 



Fuudidus am'eus, Cope, Proc. Acad. Nat, Sc. Philad, 1865, p. 78. 



Evidently closely allied to H. indchellus. 



D. 10. A. 11. V. 6. L. lat. 33. L. transv. 9. 



The height of the body is two -ninths of the total length (without 

 caudal), the length of the head one-fourth ; the width of the inter- 

 orbital space is one-half of the length of the head. Eye large, equal 

 to the length of the snout, and two-sevenths of that of the head. 

 Pectorals not reacliing ventrals, nor ventrals the vent (female?). 

 Origin of the anal in advance of that of the dorsal, the latter being 

 midway between the root ot the caudal and the end of the ossa 

 nasalia. Uniform light golden brown, below pale yellow ; a brown 

 band runs fi-om the end of the snout to the root of the caudal. ( Cope.) 



Grosse Isle, Michigan. Specimens 2 inches long. 



