112 CLASS XIV. 



Sp. Osteofjlosmm VandelUl Cuv. et Valenc. Polsa. xix. PI. 57' ; in the river 

 Amazon. The dorsal fin is long; the gill-membrane has lo ra>s ; there 

 are two pyloric appendages, as in Mvrmyrm. — Onteoz/lossum formosiim Mu- 

 KLLER and ScHLEGEL, Verkand. over de nat. Geschiedenis der Nederl. overze- 

 esche Bezittingen, 1839 — 1844» Pi^c^> Tab. I, has a short dorsal fin, and 15 

 rays in the gill-membrane. This species occurs in lakes and rivers in the 

 south of Borneo. {Ischnosoma hicirrko»um Spix, Select. Spec, et Gener. 

 Pise. Tab. 25, corresponds exactly with Osteor/lossum VandeUii, except that 

 the anal fin is confluent with the caudal fin. Valenciennes thinks that 

 this may be an occasional malformation.) 



Sudis Cuv. (not Rafin.), Arapatma Muell.. Vastres Valenc. 

 Body elongate, covered with large hard scales. Head covered with 

 thick scaleless skin. Teeth conical in jaws, the upper in a single 

 row. Teeth crowded and acute in vomer, sphenoid, palatine and 

 pterygoid bones, and in tongue. Branchiostegous membrane with 

 16 rays. Dorsal fin and anal remote, short, covered, as is caudal 

 fin, with scales. 



Sp. Sudls giga.^ Cv\., Vastres CuvtenYAi,'E'SC. , Cuv. P. Ani., 1817, PI, X. 

 fig. 4 (ed. 2, 1829, PI. XII. fig. 4), and some other species ; see Valen- 

 ciennes in Cuv. et Val. Poiss. xix, pp. 433 — 464. These fishes attain 

 a length of 6 or even 8 feet, and live in the river Amazon. 



Ilete/roti'i Ehrenb. (spec, of /S'w^/i'.s Cuv., RuEPP.). Body covered 

 witli large hard scales. Maxillary teeth recurved, slender, approxi- 

 mate, in a single row; teeth in pterygoid bones setaceous; vomer, 

 sphenoid and palate-bones edentulous. Branchiostegous membrane 

 with 8 rays. Dorsal and anal fins remote, elongate, depressed; 

 caudal fin small, rotundate ; scales in these fins none. 



Sp. Ileterotis Ehrenhergii Valenc, Sudis niloticus Rueppell Beschr. u. Abb. 

 mehrerer neuer Fische, 1829, Tab. 3, fig. 2, Cuv. et Val. Poiss. xix. PI. 

 584 (at the third branchial arch Ehrenberg found an enigmatical conical 

 appendage with a spiral canal). — A similar species occurs in the Senegal, 

 Jleterotis Adansoni Valenc. 



This genus also has, like Osfeoglossinn, two pyloric appendages, which 

 here are large. 



Notopterus Lacep. Body towards the tail recurved, compressed, 

 covered with small scales; abdomen bicarinate, serrate. Teeth 

 acute, crowded, in several rows in margin of jaws ; lesser teeth 

 crowded in palate, vomer and sphenoid bones. Branchiostegous 

 membrane with 6—8 rays. Cheeks and opercles scaly. Ventral 

 fins very small. Dorsal fin small, high, almost in middle of back. 



