318 CALIFORNIA ACADEMY OF SCIENCES. 



'jg. Maxillary barbels double. 

 j. Teeth broad incisor-like, in a single series on the jaws; caudal 

 forked. Pareiodox lxvi. 



,;■;. Teeth conical, in several series; caudal rounded. 



MlUROGLANIS LXVII. 



Subfamily CETOPSIN^. 

 LVII. Cetopsis. 



Cetopsis Agassiz, Gen. et Spec. Pise. Bras. 11. (sp.) 



Cetopsis Bleeker, Nederl. Tijdschr. Dierkunde, i, 111, 

 1 863 (caeciitiens) . 



Hemicetopsis id. 1. c. {candira). 



Pseudocetoj)sis id. 1. c. (gohioides). 



Type: Silurus coecutiens Lichtenstein. 



Barbels six, the mental barbels disposed as to pairs. 

 Eyes rudimentary, covered with skin. Teeth villiform 

 or compressed-conical or incisor-like, in a single series 

 or in a band. Teeth on the vomer. No nasal barbels; 

 caudal forked. 



Habitat: Amazon and its tributaries; Guayaquil. 



ANALYSIS OF THE SPECIES OE CETOPSIS. 



(t. Teeth all conical or incisor-like, those on the vomer in a single series. 



(Hemicetopsis). 



b. Teeth on the mandible and on the iutermaxillaries in a single series. 



Anterior nares H times as wide apart as the posterior; gill-openings 



entirely below the first pectoral ray; inner margin of the ventrals 



entirely free; pectorals reaching half way to the ventrals. 



cand'iru 249. 

 Jih. Teeth on the iutermaxillaries in 2 or .3 series, mandible with 2 series 

 of teeth, anterior nares nearer together than the posterior; gill-open- 

 ing as far above as below the first pectoral ray; inner ventral ray con- 

 nected with the belly by a membrane. Distance of the dorsal spine 

 from tip of snout 3 in the length; first dorsal ray as long as the head. 

 Pectorals shorter than the head not quite reaching the ventrals. Cau- 

 dal and dorsal dotted with dark, other fins plain; dorsal surface dark 

 jDlumbeus, sides of body and head silvery white with irregular sjjots; 

 lower parts silvery white. Head 4-4^; depth 5-6; D. I, 5; A. 26-27; 

 P. I, 8; V. 6. (Steindachner). plnmhcm 250. 



aa. Teeth on the iutermaxillaries villiform in a band; those on the vomer 

 and on the mandible incisor-like, in a single series. (Cetopsis.) 



coecutiens 251. 



