6. LUCANIA. 309 



lower jaw projecting beyond the upper ; teeth tricuspid, in a single 

 series in both jaws. 



Alpine pools of the Atlas. 



1. Tellia apoda. 



Gervais, I. c. ; Valerie, in Compt. Rend. 1858, xlvi. p. 715. 



D. 15. A. 13. 



The dorsal fin commences a little before the posterior third of the 

 length of the body, 

 lliver TeU. 



5. LIMNURGUS. 



Gu-ai'dinichthys*, Bleek. Cyprin. p. 481. 



Cleft of the mouth directed upwards, rather narrow, upper jaw 

 very protractile ; bones of the mandible firmly united ; both jaws 

 with a series of small subcylindrical teeth. Scales rather small. 

 Dorsal and anal fiuQS many-rayed, but not very long ; anal below 

 the dorsal ; sexes not differentiated by modification of the anal fin. 

 Intestinal tract about as long as the fish. The gill membranes of 

 both sides are partially united, and not attached to the isthmus. 



Mexico. 



1. Limnurgus variegatus. 



Lucania, sp., Girard, Troc. Acttd. Nat. Sc. Philad. 1859, p. 118. 

 Giraadiniclithys innomiuatus Q.) *, Bleek. I. c. p. 484. 



D. 20-21. A. 22-23. V. 6. L. lat. 44. 



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

 is scarcely one-fourth of the total length (without caudal). The 

 neck is arched, the upper profile of the head being concave. Head 

 thick, with the snout obtuse, the mandible being vertically directed 

 upwards. The diameter of the eye is one-half of the width of the 

 interorbital space, which is two-tiLfths of the length of the head. 

 The origin of the dorsal fin is midway between the root of the caudal 

 and the occiput, and, in females, conspicuously in front of that of the 

 anal. Brownish olive, with irr,egular dark-brown cross bands, which 

 are sometimes confluent. 



Vicinity of the city of Mexico. 



a. Many adult female specimens, 2| inches long. Old Collection. 



6. LUCANIA t. 



Lucania, sp., Girard, Proc. Acad. Nat. Sc. Philad. 1859, p. 118. 



Cleft of the mouth small ; bones of the mandible firmly united ; 

 snout not produced, the lower jaw more or less prominent ; both 

 jaws with a single series of conical teeth. Scales rather large. Rays 



* This barbarous name has been proposed by Bleeker, who never saw the 

 species. 



t 1. Lucania afRnis, Girard, Proc. Acad. Nat. Sc. Philad. ISO'J p. 118. — 

 Matamoras. 



