188 PROCEEDINGS OF THE NATIONAL MUSEUM vol.94 



rest flexible, extending past caudal fin; width of mouth 

 about 1]'^ in length of head. (Fig. 3, /.) 



Platystomatichthys Bleeker 

 166. Adipose fin base shorter than anal fin base; eye nearer to end 

 of snout than end of operculum; premaxillary band of teeth 

 very wide, not arrow-shaped; 2 patches of vomer and pala- 

 tine teeth; width across angle of mouth % length of head; 

 maxillary barbel reaching to anal fin ; color darker above, paler 

 below, with black spots on head, back, dorsal and pectoral 

 fins; an interrupted blackish longitudinal band from axil of 



pectoral to base of anal fin Sorubimichthys Bleeker 



146. Upper jaw not greatly prolonged and flattish but normal, lower jaw 

 only a little shorter than upper jaw; eyes superior. 

 17a. Dorsal rays I, 9 or I, 10; small patches of palatine teeth remote 

 from vomer and transversely arranged; maxillary barbels long, 

 reaching past caudal fin; adipose longer than anal fin base; 

 caudal deeply forked; eyes superior. 



Sciades Miiller and Troschel 

 176. Dorsal rays I, 7 or I, 8; patches of vomerine and palatine teeth 

 separated, each patch smaller than eye, the two vomerine 

 patches of teeth meeting in midline in large adult; width of 

 head 1.2 in its length; maxillary barbels heavy, reaching to 

 caudal fin; width of mouth V/s in width of head and IJlo in 

 length of head; interorbital space concave; inner mental barbel 

 remote from lip; occipital process longer than wide and meet- 

 ing predorsal plate; adipose fin much longer than anal; gill 



rakers 4 or 5+11. (Fig. 3, d.) Perrunichthys, new genus 



17c. Dorsal rays I, 6 or I, 7; vomerine and palatine patches of teeth if 



widely separated larger than eye; 



18a. Occipital process very broad, as is predorsal plate, and not 



meeting the latter; toothed areas of vomer and palatine 



contiguous, in large pentagonal patches; head as broad as 



long; dorsal I, 7; maxillary barbel not reaching past dorsal 



fin; adipose fin with rays distally; width of head at angle of 



mouth 2 in head; gill rakers 4+ 15-Phractocephalus Agassiz 



186. Occipital process longer than broad and meeting or almost 



meeting predorsal plate. 



19a. Teeth on premaxillary longer, depressible, and slenderer than 



short villiform teeth on vomer and palatines arranged in a 



band; width of head about I}! to 1^ in its length; dorsal 



rays I, 6; maxillary barbel reaches to adipose or as far as 



caudal fin; width of mouth 1}^ in head and 1J4 in width of 



head; occipital process not quite meeting predorsal plate; 



caudal deeply forked; adipose fin longer than anal base. 



(Fig. 3, e) Brachyplatystoma Bleeker 



196. Villiform teeth in roof of mouth and on dentaries, all uniform. 



20a. Teeth on vomer in form of a band behind premaxillary 



band of teeth (see fig. 3, c); width of head 1.2 in its 



length; maxillary barbel not reaching past dorsal fin; 



width of mouth at angle of jaws 1.4 in width of head. 



Paulicea Ihering 



