ICHTHYOLOGY. 



75 



represented isolated in a, &, c, and d. 

 from the lateral line : and. fig\ 9. a s 



Fig. 7 is a scale from the dorsal region 



Fig. 8, a scale 



Catal. No. 



869 



870 

 871 



872 

 873 

 874 

 875 

 876 

 877 

 878 

 879 



List of specimens. 



No. of spec 



24 

 8 

 3 



10 

 8 

 4 



2 



36 



1 

 4 



Age. 



Locality 



Adt.&y'g. Rio Nueces, Texas 



Rio Leona, Texas - 



Zoquito, Texas 



Camanche Springs, Texas 

 Elm creek, Texas 



Turkey creek, Texas 

 San Felipe, Texas.. 



Devil's river, Texas 

 Brownsville, Texas. 



Mouth of Rio Grande (Rio Bravo) 

 Rio Sabinal, Texas 



When 

 collected. 



1851 

 1851 



1851 

 1851 

 1851 

 1851 

 1851 

 1851 

 1852 

 1853 

 1854 



Whence obtained 



Col. J. D. Graham 



do 



do 



do 



do 



do 



do 



do 



Nature of 



8|»'cimcn. 



Alcoholic. 



do 



d 



do 



do 



.lo 



do 



do 



Captain Van Vliet do 



Major Emory do 



do 



do 



Family SCOPELIDAE. 



One specimen of Saurus mexicanus was collected by Gustavus Wiirdemann, along the coast 

 of Texas. It is the only species, so far known, representing this family in the Gulf of Mexico. 



Family CLUPEIDAE. 



Five species of this family have been gathered at various places along the Gulf of Mexico. 

 Amongst them are two Engraulis (anchovies), one Meletta, one Chatoessus, and one Clxpeonia. 

 They are chiefly due to the exertions of Captain Van Vliet, John H. Clark, under Major Emory, 



Wurdeman 



Family MUKAENIDAE. 



These are eel-like fishes, characterized by the absence of ventral fins, and sometimes also by 

 the want of the pectorals themselves. The air-bladder has a communication with the throat 



through an air-duct, as is the case in the sub-order of Malacoterygil ab dominates. Pseudobranchia 

 do not exist in this family. The pyloric appendages are wanting. As far as anatomic obser- 

 vations have been traced upon representatives of this family, there seems to be no ovi- 

 duct : the eggs falling in the abdominal cavity, whence expelled through a postanal aperture. 



ANGUILLA TYR ANNUS, Grd. 



Plate XL. 



Spec. Char. — Eiead quite depressed ; anterior third of body sub-cylindrical, somewhat deeper than wide, compreMed upon 

 the rest of its length. The cephalic region measured from the extremity of the lower jaw to the insertion of the pectoral fins, 

 enters about seven times and a half in the total length. The lower jaw is longer than the upper ; the gape of the mouth is 

 nearly horizontal ; is angle, corresponding to a vertical line drawn inwardly of the posterior rim of the orbit. The eye is well 

 developed and sub-circular ; its diameter entering twice upon the distance between its anterior rim and the tip of the lower jaw. 



