2 Mr. J. R. No.iman — A Revision 



B. A toothed bone between the distal end of the prasmaxillary and 

 the middle of the maxillary. 



Pelvic fins present r 6. Neosteus. 



Pelvic tins absent 7. Pliosteostoma. 



II. Maxillary adherent to praemaxillary ; canine teeth. 



8. Ckirocentrodon. 



1. Ilisha, Gray, 1846. 



(Grav) Richards, Ichth. China, p. 306. 

 Platycjastcr, Swainson, Nat. Hist. ii. p. 294 (1839). 

 Pellona, Cuv. & Val. Hist. Nat. Poiss. xx. p. 300 (1847). 

 ? Zunasia, Jordan & Metz, Mem. Carnegie Mus. vi. 1913, p. 7. 



Form elongate, compressed ; abdomen sharp-edged, with 

 scutes forming a continuous series on thorax and abdomen. 

 Mouth moderate, terminal, with the lower jaw projecting ; 

 maxillary with a narrow proximal and an expanded distal 

 part ; in front of the narrow part a ligament runs from 

 the end of the prsem axillary to the broad part of the 

 maxillary ; two well-developed supramaxillaries. Minute 

 teeth in jaws ; no canines ; rasp-like bands of teeth on 

 palatines and pterygoids ; an elongate patch of teeth on the 

 tongue. Scales of moderate size ; with irregularly paired 

 transverse grooves, the inner ends of which are separated 

 by an interspace. Dorsal of 14-21 rays ; anal with 33-52 

 rays, length of base 2^ to 3| in length of body, origin 

 below or just behind dorsal; upper pectoral ray strong; 

 pelvics small. Gill-rakers stout, spinulose, not very 

 numerous (16-25). 



Tropical Indo-Pacific. 



Ilisha (Pellona) bleekeriana, Poey (' Repertorio,' ii. 1867, 

 p. 242), is placed in the genus Ilisha by Jordan and Evermann 

 (Bull. U.S. Nat. Mus. xlvii. 1896, p. 436), but, unless the 

 description is quite incorrect (teeth somewhat long and 

 curved, with one canine above and two below on each side), 

 it is not an Ilisha at all, and is probably more nearly related 

 to Chirocentrodon, GUnther. 



Synopsis of the Species, 



I. Less than 46 scales in a longitudinal series; lG-20 scutes before 

 insertion of pelvics. 



A. Depth of body 2j to 3} in the length. 



Anal of 45-49 rays ; origin just beliind dorsal .... 1. hrachysoma. 

 Anal of 42 rays; origin below posterior third of dorsal. 2. afncana. 

 Anal of 38-41 rays; origin below last dorsal ray . . 3. indica. 



B. Depth of body 3f to 4 in the length. 

 Origin of dorsal much nearer end of snout than base 



of caudal; origin of anal lust behind dorsal . . 4. motius. 



