346 CALIFORNIA ACADEMY OF SCIENCES. 



LXVI. Pareiodon. 



Pareiodon Kner, SB. Ak. Wien, xvii, 160, 1855 (mi- 

 crops) . 



Pariodon Gunther, Cat. Fish. Brit. Mus. v, 275, 1864 

 (substituted). 



Gentrophoriis Kner, Denk. Ak. Wien, xvii, 161, 1855 

 (substituted for Pareiodon). 



Astemomyderus Guichenot, Rev. et Mag. Nat. Hist, 

 xii, 525, 1860 (pusillus). 



Type: Pareiodon wicrops Kner. 



Gill-membrane united with the isthmus; a single series 

 of incisor-like teeth on each jaw; two pairs of maxillary 

 barbels; opercle and preopercle with short spines; caudal 

 forked. 



286. Pareiodon microps. 



Pareiodon microps Kner, SB. Ak. Wieu, xvii, 160, 1855 (Borba?); 

 Eigeum. & Eigeum. 1. c. 



Pariodon microps Gtluther, Cat. Fish. Brit. Mns. v, 275, 1864 (cop- 

 ied); Cope, Proc. Acad. Nat. Sci. Phila. 1872, 290 (Ambyiacu). 



Trichomijcterus pusillus Castelnavi, 1. c. 50, pi. 24, fig. 4, 1855 (Ara- 

 gnay; Amazon). 



Astemomyctcrus pnsillus Guichenot, 1. c. (Araguay; Amazon). 



Habitat: Amazons and tributaries. 



Body terete; lips thickly papillose, interopercle witli 5 

 spines; grayish above, lighter below. 

 Head 8; D. 9; A. 7. (Kner.) 



LXVII. MlUROGLANIS. 



Miuroglanis Eigenm. & Eigeum. Proc. Cal. Acad. 2d 

 Ser. ii, 55, 1889 {platycephalus). 



Type: Miuroglanis platycephaliis E. & E. 



This genus is based on a very small specimen. The 

 characters are, however, so well marked that we do not 

 hesitate to describe it as new. 



Gill-membrane broadly united with the isthmus, with- 

 out a free margin. Maxillary barbels two. Mouth in- 



