PLEUROKECTID^E. 



441 



3. Genus PSEUDORHOMBUS, Bleeker. 

 Syn. Chcenopsetta, Gill. 



Cleft of mouth deep, the maxilla usually nearly half as long as 

 the head. Gill-membranes united beneath the throat but not 

 attached to the isthmus. Gill-rakers lanceolate. Eyes on the left 

 side ; interorbital space not concave. Jaws and dentition nearly 

 equally developed on both sides ; teeth in both jaws of unequal 

 size and in a single row ; vomer, palate, and tongue edentulous. 

 Pin-rays simple ; the dorsal fin commences on the snout. Scales 

 of moderate size or rather small, and extended on to the dorsal 

 and anal. Lateral line having a strong curve anteriorly. 



Geographical Distribution. Atlantic, Pacific, and Indian Oceans, 

 chiefly tropical. 



ris of Indian Species. 



Five to ten pointed teeth in either jaw 1. P. arsius, p. 441. 



Twenty to thirty teeth in either jaw 2. P. javanicus, p. 442. 



Teeth minute 3. P.'triocellatus, p. 442. 



1317. (1.) Pseudorhombus arsius. (Fig. 157.) 



Pleuronectes arsius, Ham. Such. Fish. Ganges, pp. 128, 373. 

 Pseudorhomhus arsius, Giinther, Catal. p. 426; Day, Fish. India, 

 p. 423, pi. xci, fig. 5 (see synon.). 



B. vii. D. 71-79. P. 11 or 12. V. 6. A. 54-61. C.17. L.I. 75-85. 



Length of head 4| to 4^, height of body 2 to 2| in the total 



length. Eyes diameter 5 in length of head, 1 diam. from end of 



Fig. 157. Pseudorhombus arsiiis. 



snout, and closely approximating, being divided by a mere ridge. 

 Teeth from five to eight in the lower jaw on the left side, and six 



