ICHTHYOLOGY MALACOPTEHYG1I. 107 



MALACOPTERYGIL 



SILURID^E. Silurns triosteyus, Heckel, "Fische Syrieus." Head elongated, 

 first ray of pectoral fin strong, serrated. D. 1, 2 ; A. 3. 86. In the Tigris, 

 near Mossoul. 



Heckel describes (1. c.) the Silurus Cous, Linu. (Pimelodus Cons, Val.), as 

 Anus Cous, on account of its having on the palate two sets of uniform teeth. 



Pimelodus pullus, De Kay. Pectoral flu pointed, caudal, emarginate; 11 

 inch. D. 1. 5 ; V. 8 ; A. 17. Northern Lakes, in. New York. P. atrarius 

 (id.) black, adipose fin narrow and high ; caudal fin emargiuate, rounded ; 

 5 inch. D. 1. 6 ; V. 8 ; A. 20. In the tributaries of the Hudson. P. cxsu- 

 dans, Jenyns. Six barbal cirrhi, the maxillary cirrhi not reaching as far as the 

 anal fin ; adipose fin not quite twice as long as the dorsal and anal fins. 

 D. 1. 7; A. 13-14. Brazil. 



Cullicthys paleatus, Jenyns, allied to C. punctatiis, Val., but it possesses, 

 besides the four usual cirrhi, two labial cirrhi also, and the maxillary cirrhi 

 reach only to about the middle of the eye. It is probably not a distinct spe- 

 cies. South America. 



CYPRINIDJE. In HeckeVs above-mentioned work on the 

 Syrian Fishes, the greater part is devoted to the Cyprini, 

 and the author places great importance, and correctly, on 

 the form of the pharyngeal teeth. The first plate repre- 

 sents their various forms, and it is in fact easy with this 

 assistance, to determine the Cyprini ; this is particularly 

 the case with those which the Berlin Museum has received 

 from Syria, through Professor Koch. The pharyngeal 

 teeth are brought under four divisions: 1. Hollow teeth 

 (dentes excavati), with a channelled depression on the 

 dorsal aspect ; they pass into spatulate and shovel-shaped 

 teeth. 2. Masticatory teeth (dentes inasticatorii), with a 

 grinding surface looking outwards, not uncinate ; they pass 

 into tessular, molar, cupped, chisel-shaped, pectinate, and 

 incisive teeth. 3. Uncinate teeth with grinding surface 

 (dentes uucinato-submolares), with a narrow, somewhat con- 

 cave grinding surface, forming a hook on the inner side ; 

 they pass into clavate, compressing, and prehensile teeth. 

 4. Uncinate teeth, without grinding surface (dentes un- 



