NO. 1532. PCECILIID FISHES OF LA PLATA BASIN— EIGENMANN. 



431 



3. PHALLOPTYCHUS JANUARIUS (Hensel). 

 Habitat. — Southeastern Brazil to Maldonado and Parag-ua}'. 

 4. CNESTERODON Garman. 



Cnesterodon Garman, The Cyprinoclont^, 1895, p. 43, pi. v, tig. 13, and pi. 

 VIII, fig. 16. {decern iiiaculatas.) 



4. CNESTERODON DECEMMACULATUS (Jenyns). 



Habitat. — Rio Grande do Sul to Maldonado and Bolivian Chaco. 

 B. PHALLOCEROS" Eigenmann, new genus. 



Each jaw with an outer series of spoon-oar-shaped teeth, somewhat 

 expanded at tip and bent backward, close set, 

 their margins in contact near their tips; much 

 smaller teeth, triangular at tips, slightly con- 

 tracted at base, forming one or more series 

 behind the larger teeth. 



Anal in the males inserted about midway in 

 length of body, the first two rays minute, the 

 third, fourth, and fifth united, of nearh' equal 

 length and separated by a slight notch from 

 the remainder of the tin, which is very low; 

 the third ray (a) much the heaviest; fourth ray 

 (/>) ending in an antrorse point, and with two 

 large, antler-like structures just below; a series 

 of retrorse hooks on its posterior face protected 

 by the fifth ray ((■)• 



Intestine about twice as long as the entire 

 fish; dorsal in female slightly posterior to 

 insertion of anal. 



Ti/pe of genus. — (ihrardinu^^ caudoniaculatu)^ 

 Hensel. 



5. PHALLOCEROS CAUDOMACULATUS 



( Hensel). 



Habitat. — Rio Grande do Sul to Paraguay. 



Paraguay specimens have the dentaries 

 firmly joined; teeth of outer row moderately 

 expanded, the inner, smaller teeth in rather 

 broad bands on the sides; in a single series or 

 much narrower band in the middle. 



In Rio Grande do Sul specimens the smaller teeth form a single 

 series mesially, and imperfectly two series laterally. (See fig. 7.) 



Fig. 7. — Distal parts of the 

 intromittent organs of 

 phalloceros caudomacu- 

 latus. a, third anal ray: 

 6, fourth anal ray; c, fifth 



ANAL RAY. 



« 0aA/l6s, intromittent organ; Kspai, horn. 



