PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 299 



Pectorals moderate, nearly half as long as head, reaching slightly 

 past the base of the ventrals. Ventrals rather short, reaching nearly 

 two-thirds the distance to the base of the anal. 



Anal moderate, beginning considerably in front of the dorsal and end- 

 ing a little behind it. Anal rays I, 18. Dorsal rays V-I, 12. 



Spinous dorsal beginning nearly midway between insertion of ventrals 

 and anal, separated from the soft dorsal by a distance equal to about 

 two-thirds the length of the base of that fin. 



Caudal somewhat forked. 



Coloration uniform in spirits, the silvery lateral band but faintly indi- 

 cated. 



The type of this species, 10^ inches long, was obtained by Professor 

 Duges in Lake Chapala, Mexico ; it is known as Pesce bianco di Cha- 

 pala ("poisson blanc de Chapala") in Guanajuato, according to Profes- 

 sor Dug^s. 



It is one of the very largest of the AtJierinidw, resembling a pike in 

 its form, and in the large head and mouth. Its nearest relative is ap- 

 parently Chirostoma humboldtianum, also from Mexico, from which it 

 differs in the much smaller scales, as well as in other characters. In Dr. 

 Girard's arrangement of the Atherinidce, this species would be likewise 

 a HeterognatJms. 



The type of Chirostoma estor is numbered 23124 in the register of the 

 TJ. S. National Museum. 



Chirostoma humboldtianum (C «fc V.) Jor. (Atherina vomerina C. & V.). 



With the preceding is a single specimen of another Chirostoma, which 

 seems to be the humholdtiana of Cuv. & Val., with which the vomerina 

 is doubtless identical. This specimen (No. 23136) has the usual silvery 

 band. D. IV-I, 10 ; A. I, 15 or 16 ; lat. 1. 50, the scales with entire 

 edges. The long head is 4^ in length to base of caudal, and the body 

 is rather slender. This example is 3^ inches in length. 



? Chirostoma brasiliensis (Quoy & Gaimard) Jor. 



Numerous specimens (catalogue number 23135) of a small Chirostoma 

 allied to brasiliensis and bonanensis are in the collection. The body 

 is short and compressed, the mouth small and oblique. Lat. 1. 36; 

 L. trans. 9. D. IV-I, 9 ; A. I, 17. Silvery lateral streak very narrow. 

 It does not fully agree with descriptions of either of the above species, 

 and its habitat is remote from both. I do not, however, think it advisable 

 at present to give it a separate name. 



Goodea atripinnis Jordan, gen. & s\>. nov. 



Generic description. — Form of Hydrargyra or Fundulus, but with 

 the intestinal tract elongate, the dentary bones movable, and the teeth 

 slender, tricuspid, movable, attached in a single series on the outer edge 

 of the jaws, not closely set. Fins small, the dorsal and anal similar, 



