CYPEINODONT FISHES. 999 



p. 62, pi. ii. fig. 3 ; Meek, Publ. Columbian Mus., Zool. v. 1904, 

 p. 131, fig. 38 ; Regan, Biol. Centr.-Amer., Pisces, p. 96 (1907). 



Gamhusia gracilis Meek, t. c. p. 130. 



Rio Lerma and Rio Balsas in Mexico ; ? Orizaba. 



13. Phalloptychus Eigenmann. 



Proc. U.S. Nat. Mus. xxxii. 1907, p. 430. 



Mouth and dentition of Pcecilia. Intromittent organ long 

 and slender ; third produced ray crossing second on right side 

 near base, meeting first and forming a closed tube ; second 

 twisted distally so that the serrations are directed laterally or 

 even forwards. 



Phalloptychus januarius. (PI. C. figs. 7, 8, and text- 

 fig. 171 A.) 



Girardinus jaiiuarius Hensel, Arch. f. ISTat. xxxiv. 1868," 

 p. 360, and xxxv. 1869, p. 89. 



Girardimis iheringii Bouleng. Ann. &, Mag. Nat. Hist. (6) 

 iv. 1889, p. 266. 



Girardinus zonatus Schreiner, Arch. Mus. Rio Janeiro, xii. 

 1903, p. 7. 



S.E. Brazil ; La Plata. 



This species may at once be recognized by its coloration, 

 having several narrow blackish vertical stripes on each side of 

 the body. Dorsal 9 ; origin above or a little behind that of anal. 



14. Phalloceros Eigenm. 



Proc. U.S. Nat. Mus. xxxii. 1907, p. 431. 



Mouth small, but bones of lower jaw rather firmly joined ; 

 teeth oar-shaped, slender, curved, as in Fcecilia. Intromittent 

 oi-gan long (about f length of fish to base of caudal) ; last segment 

 of first produced ray modified into an antrorse appendage which 

 bifurcates, each foi-k antler-like in form ; anterior branch of 

 second ending just beyond the first in an antrorse process. 



Phalloceros caudomaculatus. (PI. C. figs. 5, 6, and text- 

 fig. 172 C.) 



Girardinus caudimaculatus Hensel, Arch. f. Nat. xxxiv. 1868, 

 p. 362, and xxxv. 1869, p. 89. 



Glaridodon januarius Garman, Mem. Mus. Comp. Zool. xix. 

 1895, p. 42. 



S.E. Brazil ; La Plata. 



The coloration readily distinguishes this species from Phallo- 

 ptychus januarius. Plain olivaceous, usually with a vertical 

 blackish spot on side below dorsal fin. ; sometimes a lateral series 

 of dusky bars. Dorsal 7-8 ; origin above middle or posterior 

 part of anal. 



