I9IO.] 



J. T. Jenkins : Indian Pleuronectidae. 



25 



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. 



Length. 



i2-g 



cms. 





i6-6 



cms. 





II-4 



13-3, 



137, 



and 16-4 



cms. 



No. L-ocality. 



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



Crown" . . 

 p 34.41 puri beach, Dr. N. Annandale 

 p 3142 pQ^j. specimens— P^, P^, P^, P^. Puri beach, 



Dr. N. Annandale 



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 Survey. 



The Indian species of Pseudorhombus may be distinguished by the following 



characteristics : — 



Anterior teeth enlarged 



Teeth minute 



^ Dorsal fin rays over 70 

 I Dorsal fin rays 70 or less . . 

 (^Longest dorsal rays at com- 

 ] mencement of posterior 



P. arsius, Bleeker. 

 P. javanicus, Bleeker. 



half of fin 



P. russellii, Gray. 



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



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 : — 



No. 



Length, mm. 



Height. 



Ratio H. to Iv. 



Dorsal fin rays. 



Ventral fin 

 rays. 



Species. 



2142 



185 



83 



2-2 



74 



6 



P. arsius. 



3438 



208 



90 



2-3 



71 



6 



„ 



343916 



271 



120 



2-2 



74 



6 





>J 15« 



246 



104 



24 



75 



6 



„ 



„ 15b 



258 



108 



2-4 



75 



6 



„ 



»J 16e 



261 



115 



2-3 



73 



6 



,, 



,, ISd 



233 



95 



2-5 



74 



6 



» 



>> 16« 



194 



81 



2-4 



76 



6 





