iqio.] 



J. T. Jenkins : Indian Plei-tronectidae. 



this is a sexual difference; at any rate it does not serve as a specific distinction from 

 P. arsius. It will be noticed that the specimens of P. javanicus are on the average 

 smaller than those of P. arsius. 



No. Locahty. 



F ^^P Off Elephant Point, Arakan Coast, "Golden 

 Crown" .. 

 Puri beach, Dr. N. Annandale 

 Four specimens — P^, P,, P., P.. Puri beach, 

 Dr. N. Annandale . . 



34 4 1 



Length. 



I2'g cms. 

 i6-6 cms. 



p S44i 



II-4, 13-3, 137, 

 and 16-4 cms. 



Pseudorhombus russellii, Gray. 



Day evidently regards this species as identical with P. arsius, but from an 

 examination of this collection I am convinced that the species are distinct. 



12242. Off Orissa Coast, Marine vSurvey. 



Anterior teeth enlarged 



Teeth minute 



The Indian species of Pseudorhombus may be distinguished by the following 

 characteristics : — 



Dorsal fin rays over 70 



Dorsal fin rays 70 or less 

 (^Longest dorsal rays at com- 

 J mencement of posterior 

 I half of fin , . . . P. russellii, Gray. 



L Anterior dorsal rays elevated P. triocellatus , Bl. Sch. 



P. arsius, Bleeker. 

 P. javanicus, P>leeker. 



The following table gives the height, length, ratio of height to length of body 

 (inclusive of caudal) and the number of dorsal and ventral fin rays in the various 

 specimens of Pseudorhombus examined : — 



