EIGENMANN: PIMELODELLA AND TYPHLOBAGRUS 255 
6762a C. M., 1, 150 mm., Caldas. Eigenmann. 
6763a-d C. M., 13596 I. U. M., 8, largest 150 mm., Barbacoas. Henn and Wilson. 
Typhlobagrus Ribeiro. 
Typhlobagrus RiBEtRO, Kosmos, No. 1, January, 1907. 
Type, Typhlobagrus kronei Ribeiro. 
In all characters but the eyes like Pimelodella. The eyes lost. 
35. Typhlobagrus kronei Ribeiro. “ Ceguinho.” (21.34 k5: a. 
Typhlobagrus kronet Rrpetro, Kosmos, No. 1, January, 1907; ErgeENMANN, Re- 
ports Princeton Univ. Exped. Patagonia, III, 1910, p. 387; Riperro, Fauna 
Bras., Peixes, IV, 1912, p. 250, Pl. XLII, figs. 2, 2A and 2B (Cavernas das 
Areiras, Iporanga, Sao Paulo); Haspman, Ann. Carnegie Mus., VII, 1912, 
p. 323 (Cavernas das Areiras). 
7443a—« C. M., 23, 74-202 mm., Caverna das Areiras, Nov. 28, 1908. Haseman. 
Head 44.2; depth about 5.5; D. usually I.6, in one ease, I.7; A. 12-15 (usu- 
ally 14). Maxillary barbel reaching to near middle of ventrals in youngest and 
oldest, sometimes a little longer or a little shorter, postmentals a little beyond 
base of pectoral. Fontanel narrow, extending to base of occipital crest, which 
reaches to dorsal plate, width of occipital crest nearly 4 in its length. Dorsal 
spine half or a little more than half the length of the head, a little less than the 
length of the pectoral spine; 8-14 moderate-sized thorns on the pectoral spine. 
Adipose fin about 3.75 in the length, its tip extending beyond the tip of the anal; 
caudal lobes of about equal width, the upper lobe the longer by .25 or .2 of the 
length of the head. 
A distinct trace of a dark lateral band on some of the specimens; margin of 
dorsal sometimes dusky. 
The region of the eye varies. No trace of an eye or optic nerve can be noticed 
in ordinary dissections of the alcoholic material at my disposal. The skin over the 
vanished eye is invaginated in various degrees, a distinct free orbital margin being 
quite evident in some specimens, less distinctly so in others. They appear as 
though the eye had been removed without greatly altering the region of the skin 
over them. 
Ribeiro says: “‘Dentre os exemplares que tivemos em mos, um possue um 
olho desenvolvido. 
“Hste facto prova perfeitamente a reversio, por heranca, 4 um caracter de 
seus antepassados; 0 orgam mede 4 millimetros no maior diametro e 0 peixe 150 
millimetros. 
