THE CYPRINODONTS. 57 



This description applies fairly well to the teeth of our specimens of 

 P. unimaciilata. The greatest deviation appears in the outer series on the 

 jaws, which teeth are not conical in adults (Plate V. Fig. 7), though in very 

 young ones there is sufficient approach to that shape to justify the statements 

 made. 



Peters, 1864, suggested the identity of vivipara and surinaraensis. Gthr., 

 1866, united them. Steindacher, 1881, after examining specimens of uni- 

 raaculata from Rio Janeiro, Parahyba, Surinam, and Cayenne, remarks : 

 " Vielleicht ist P. sunnameitsis Val. von P. unmaculata Val. der Art nach 

 nicht verschieden." Numerous representatives, from Eio Janeiro, Porto 

 Seguro, Bahia, Pernambuco, Parahyba, a number of points on the Amazon, and 

 from British Guiana, make it reasonably certain that Valenciennes species 

 are identical. The figure given by Bloch and Schneider is quite mislead- 

 ing. Peters in his study of the type found the fork in the tail to be due to 

 accidental mutilation, and the bands he traced to loss of scales. As shown in 

 the description many individuals are yellowish, hardly so bright as the figure, 

 and transverse bands, not distributed quite as in the figure, are of the com- 

 monest marks in the specimens of unimacuMa Val. The figures in the for- 

 mula originally given for vivipara, are, excepting the number of ventral rays, 

 generally conceded to represent variations of one or two each from the actual 



averages. 



Pcecilia dominicensis. 



Plate IV. Fig. 12, teeth. 



Pcecilia dominicensis Val., 18i6, C. V. Poiss., XVIII, 131, pi. 526, fig. 1 ; Blk., 1860, Cypr., 486; Gth., 

 1866, Cat., VI, 346 ; Jor., 1887, P. U. S. Mus., IX, 564. 



Pcecilia melamgaster Gtli., 1866, Cat., VI, 345 ; Jor., 1SS7, P. U. S. Mus., IX, 564. 

 PcBcilia {Acropcecilia) trideiis Hilg., 1889, Sb. Ges. Nat. Pr., 52. 



B. 5-6 ; D. 9-8 ; A. 10-9 ; V. 6 ; P. 15 ; LI. 26-28 ; Ltr. 8 ; Vert. 

 14 + 15. 



Body rather short and stout, compressed, caudal pedicel deep ; depressed 

 on nape and head. Head broad, flattened on the crown, two sevenths of the 

 length to the base of the caudal, less than depth of body. Snout short, about 

 half the length of the orbit, subtruncate ; chin short, steep. Mouth as wide 

 as the eye, opening upward ; lower jaws weak, loosely joined, longer than 

 upper ; upper shorter, protractile. Teeth in outer series slender, narrow at 

 the bases, broadened toward the apices, hooked ; inner teeth small, in a vili- 

 form band, tricuspid ; pharyngeal slender, hooked, with a shoulder, arranged 



