2764 Bulletin //, United States National Museum. 



examiuedO.il to 0.44 m. long. Porto Alegre; Babia; Nazareth, near Bahia; 

 Rio Janeiro; Para; Porto Seguro; Sao Matheos; Canuavierias. (Eigcn- 

 manu & Eigenmaun, Neinatoguathi, 63.) 



176. SELENASPIS PAllKERI (Traill), text, p. 125. 



72. NETUMA, Bleeker. 



Dorsal shield small, lunate ; teeth on jialate villiform, the patch on each 

 side with a backward-extending process or angle. 



Subgenus NOTARIUS, GUI. 



Occipital process constricted at base. 



177. NETUMA GBAIVDICASSIS (Cuvier & Valenciennes). 



Head 3? to 3|; depth 5| to 6. D. I, 7; A. 18; eye 3 to 3i in snout, 8^ to 

 10 in head, 4 to \:\ in interocular. Body cylindrical in front, tapering to 

 a slender caudal peduncle. Head greatly depressed, profile almost 

 straight, descending, the width of the head 1^ to 1^ in its length, its 

 depth 1* to 2 in its length. Occipital process with a deep constriction 

 where it joins the occiput, shaped like a clover leaflet, much as Fclichthys 

 paxaminsh, sometimes broader than long, sometimes much longer than 

 broad, sometimes keeled. Center of the fontanel over the middle of eye, 

 the fontanel not continued backward as a groove; occipital process, top 

 of head, and humeral process granular; interorbital region with 4 ridges, 

 the inner ones bounding the fontanel, the outer ones running obliquely 

 backward from near the posterior nasal opening. Maxillary barbels 

 reaching to the base of the pectoral, mentals to gill opening, postmentals 

 a little longer. Upper jaw projecting a diameter of the eye or more, the 

 lip very wide, especially in front, making the nose pointed; teeth of both 

 jaws rather large, those on the palate somewhat smaller; the depth of the 

 intermaxillary band 7 to 'J in its width ; the mandibulary band very shal- 

 low; vomerine teeth none in 3 of the examples, a small patch on one side 

 in another specimen, and a small patch on each side in another; palatine 

 patches triangular, produced Ijackward. Gill membranes meeting in an 

 angle, forming a fold across the isthmus; gill rakers 6 -\- 10. Distance of 

 dorsal spine from snout 2^ to 2^ in the length, the spine broken in the 

 specimen studied. Distance of adipose fin from the dorsal 3f to 4 in 

 the length; adipose fin at least as long as the dorsal fin, adnate. Caudal 

 tin forked, the upper lobe longer, about 5 in the length, the tips broken ; 

 anal fin apparently longer than high, but the rays are somewhat worn oft'; 

 ventrals small ; pectoral pore large, slit-like. Color light brown above, 

 somewhat snmtty below from the occurrence of minute scattered dots. 

 We have examined 4 specimens from 0.23 m. to 0.33 m. long, collected by 

 Agassiz & Bourget, Thayer Expedition, at Maranhao, and a fifth, 0.21 m. 

 long, collected by Professor Agassiz at Bahia. (Eigcnmann »fe Eigenmaun, 

 Nematognathi, 65.) 



