MAY 28 1917 



MEMOIRS 



OF THE 



OAENEGIE MUSEUM 



Vol. VII. No. 4. 



PIMELODELLA AND TYPHLOBAGRUS.^ 



By Carl H. Eigenmann. 



(Plates XXIX-XXXV.) 



Pimelodella and Typhlobagrus are two closely related genera of Siluridse of 

 the fresh waters of South America. Pimelodella is a widely distributed genus 

 with many species. Typhlobagrus is an offshoot from Pimelodella. Eyes have 

 disappeared in this genus and it is confined, so far as known, to the caves near 

 Iporanga in southeastern Brazil. 



Pimelodella Eigenmann & Eigenmann. 



Pseudorhamdia Steindachner (non Bleeker), Sb. Akad. Wiss. Wien, LXXIV, 



1876, Susswasserf. Slidostl. Bras., Ill, p. 46 (lateristriga) . 

 Pimelodella Eigenmann & Eigenmann, Proc. Cal. Acad. Sci., (2), I, 1888, p. 131; 



Occasional Papers Cal. Acad. Sci., I, 1890, pp. 99 and 147. 



Type, Pimelodus cristatus MiiUer & Troschel. 



Nares remote; teeth viUiform, in bands; gill-membranes free from the isthmus; 

 dorsal short, with a feeble, pungent spine; anal short, with 11-15 rays; pectoral 

 with a strong i^ungent spine variously armed with thorn-like teeth on its posterior 

 (inner) edge; a long, adnate, adipose fin; caudal fin deeply forked, one or the other 

 lobe frequently wider, or longer; well-developed maxillary barbels reaching to 

 end of pectoral, or beyond the caudal; two pairs of mental barbels, sometimes in a 

 nearly straight line; a frontal and a parietal fontanel, the latter reaching to the 



^ Contribution from the Zoological Laboratory of Indiana University, No. 154. 



229 



