112 CLASS XIV. 



Sp. Osteoglosswn Vandellii Cuv. et VALENC. Poiss. xix. PI. 571 ; in the river 

 Amazon. The dorsal fin is long; the gill-membrane has 10 rajs; there 

 are two pyloric appendages, as in Mormyrus. Osteoglossum formosum MU- 

 ELLER and SCHLEGEL, Verhand. over de nat. Geschiedenis der Nederl. overze- 

 esche Bezittingen, 1839 1844, Pisces, 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 bicirrkosum SPIX, Select. Spec, et Gener. 

 Pise. Tab. 25, corresponds exactly with Osteoglossum Vandellii, except that 

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

 this may be an occasional malformation.) 



Sudis Cuv. (not RAFIN.), Arapaima 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. Sudis gigas Cuv., Vastres Cuvieri VALENC., Cuv. R. Ani., 1817, PI. x. 

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

 CIENNES in Cuv. et VAL. Pows. Xix. pp. 433464. These fishes attain 

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



Heterotis EHRENB. (spec, of Sudis Cuv., RUEPP.). Body covered 

 with 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. Heterotis Ehreribergli VALENC., Sudis niloticus KUEPPELL 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, 

 Heterotis Adansoni VALENC. 



This genus also has, like Osteoglossum, 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. 



