318 CALIFORNIA ACADEMY OF SCIENCES. 



</</. Maxillary barbels double. 



j. Teeth broad incisor-like, in a single series 011 the jaws; caudal 

 forked. PAREIODON LXVI. 



jj. 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, 

 1863 (cuucutiens) . 



Hemicetopsis id. 1. c. (candira). 



Pseudocetopsis id. 1. c. (gobioides). 



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 OF CETOPSIS. 



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



(HEMICETOPSIS). 



/>. Teeth on the mandible and on the interniaxillaries in a single series. 

 Anterior uares 1| 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. 



candtru 249. 



bb. Teeth on the interniaxillaries 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 uon- 

 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 

 plumbeus, sides of body and head silvery white with irregular spots; 

 lower parts silvery white. Head 4-4J; depth 5-6; D. I, 5; A. 2(5-27; 

 P. I, 8; V. 6. (Steiiidachner). plumbeus 250. 



(to. Teeth on the interniaxillaries villiform in a band; those on the vomer 

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



c&ciitiens 251. 



