426 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



aa. Teeth tricuspid. 



( c. Teeth in a single series Ci/prmodon and JordaneUa.) 



cc. Each jaw with several series of tricuspid teeth, thoae of the outer row being 

 much the largest; intromittent organ simple, the second of the elongated 

 anal rays ending in a spine; no claspers; all the rays included in a loose 

 membrane, graduated. Alimentary canal about equal to the entire length. 



D. 8 or 9; A. 9 or 10; hit. 1. 29 Fitzroya, 2. 



aaa. Each jaw with two or more series of sjjear, oar, or spoon-shaped teeth, those of 

 the outer series much the largest. D. 7-10; A. 9-12; lat. 1. 28-31. Intromit- 

 tent organ of those in this territory very long; formed by the third, fourth, 

 and fifth rays, the posterior rays much shorter. 

 d. Intromittent organ without "claspers." 



Fig. 1. — ACANTHOPHACELUS RETICULATUS, SHOWING COLOR VARIATION IN THE MALE. 



(e. Intromittent organ short, with numerous recurved hook.M on both mar- 

 gins; a prepuce (see figs. 1 and 2) Acanthitphacelm. ) " 



ee. Intromittent organ with the prolonged anal rays rolled uj) to form a tube; 

 alimentary canal about twice the length of the fish. . . J'liallopiijchus, 3. 



eee. Intromittent organ " blade like," without hooks Ciieaterodou, 4. 



dd. Anal not rolled up; tip of intromittent organ with clasj^ers and without 

 prepuce. 

 (/. Claspers consisting of three finger-like processes at tip of first prolonged 

 ray of the anal (see figs. 3, 4, and 5). 



Glaridichthi/s, Toxus, and Girardinus. ) 



"Type, Pcecilia reticulatus Feters. ccKav^a, spine; (pccKeXoi, bundle. 



