SOUTH AMERICAN NEMATOGNATHI. 237 



175- Doras marmoratus. 



Doras inamorata* (Beinhardt MS.) Liitken, Dan. Selsk. Skr. 30 r 



1874 (Bio das Velhas), id. 1. c. 1875, pi. i, fig. i; Steindachuer, SB. 



Ak. Wien, Ixxi, 147, pi. iv, 1875 (Brazil); Eigenm. & Eigenm. 



Proc. Cal. Acad. 2cl Ser. i, 163, 1888 (Bio San Francisco; Bio 



das Velhas). 

 Habitat: Bio San Francisco and its tributaries. 



Robust, as deep as wide below the dorsal spine, some- 

 what compressed behind. Head short and broad, its 

 width about equal to its length; its depth If in its 

 length. Dorsal plate greatly enlarged, scarcely narrower 

 than the widest part of the skull, having a backward 

 process which has a downward projection in front. 

 Surface of the bones with vermiculating ridges, which 

 are granular anteriorly and laterally; sutures distinct. 

 Dermal ossification of the scapula not reaching the 

 humeral process. Sides of the head and snout entirely 

 covered with smooth skin. Fontanel scarcely evident 

 externally. 



Eye 2J in the snout, 7| in the head, 2f in the inter- 

 orbital. Nasal and suborbital bones concealed beneath 

 the skin. 



Maxillary barbels reaching the second fourth of the 

 pectoral spine; mental barbels to somewhat behind the 

 lower angle of the gill-openings, postmentals scarcely 

 beyond base of pectorals. 



Snout at the rictus measuring 2J 2J in length of the 

 head. Upper jaw projecting. 



Teeth well developed, setiform; intermaxillary band 

 6-8 times as wide as deep. 



Gill-membranes separate to below the posterior mar- 

 gin of the eye. Breast entirely covered with skin. 



First three lateral plates touching the emarginate edge 

 of the process of the dorsal plate, not extending to the hu- 

 meral process; region between the scapula and first lat- 

 eral plate naked; the third lateral plate highest, about 

 2 in the head, the fourth only two-thirds as high as the 



