220 CALIFORNIA ACADEMY OF SCIENCES. 



cc. Humeral process much longer and stronger than the coracoid pro- 

 ' cess; lateral plates not meeting on the back in front of a point mid- 

 way between the dorsal fins. DORAS XL. 

 bb. Eye situated in the middle or behind the middle of the head. 



OXYDORAS XLI. 



aa. Maxillary and sometimes the mental barbels fringed. Eye large. 

 Teeth rudimentary or absent. HEMIDORAS XLII. 



XXXIX. PHYSOPYXIS. 



Physopyxis Cope, Proc. Philad. Acad. Nat. Sci. 1882, 

 273 (lyra). 



Clavicles and coracoids greatly developed below, form- 

 ing a shield which extends forward to below the eyes; 

 coracoid process extending to beyond the base of the 

 ventrals. Gill -openings much reduced. No. adipose 

 dorsal. Teeth minute, in several series. 



160. Physopyxis lyra. 



Physopyxis lyra Cope, 1. c. (Ambyiacu River). 

 Habitat: Ambyiacu River. 



Muzzle short and broadly truncated. Eye 4-J- in the 

 head, 1 in the snout, 3 in the concave interorbital. Dor- 

 sal plate keeled, roof-shaped, its posterior processes end- 

 ing behind the last dorsal rays. Humeral process striate, 

 extending to below the dorsal spine. Postcoracoid pro- 

 cesses striate. Prenasal bones pectinate. Dorsal spine 

 straight, grooved, spiny on its lower half in front, smooth 

 behind. Pectoral spine large, curved, extending to the 

 second or third anal ray. Caudal truncate. Head dark 

 brown, a light band from one humeral base to the other; 

 another between the orbits. Posterior parts yellowish, 

 a dark spot at the base of the dorsal, a band on the mid- 

 dle of the sides and one at the base of the tail. 



D. I, 4; A. 12; V. 6; P. I, 2. (Cope). 



XL. DORAS. 



Dora* Lacepede, Hist. Nat, Poiss., v, 116, 1803 (eaH- 

 natus and 



