400 PLEITROIsTICTID^. 



Si/no2ysis of the Genera. 



I. The Jaws and the dentition are nearly equally developed on both sides. 



A. The dorsal fin commences on the neck ... 1. Psettodes, p. 401. 



B. The dorsal fin commences above the eye. 



Eyes on the right side ; teeth of the upper 

 jaw in two series 2. Hippoglossus, p. 402. 



Eyes on the right side ; teeth small, in a 



single series 3. Hippoglossoides, p. 405. 



Eyes on the left side ; teeth villiform 4. Tephritis, p. 406. 



C. The dorsal fin commences before the eye, on the snout. 



Eyes on the left side ; teeth of the jaws 



forming a band ; vomerine teeth 5. Rhombus, p. 407. 



Eyes on the left side, close together ; teeth 



of the jaws forming a band ; vomerine 



teeth none 6. Piirvnorhombus, p. 414. 



Eyes on the left side; teeth small, in a 



single series; vomerine teeth none. Scales 



deciduous 7 Arnoglos.sus, p. 415. 



Eyes on the left side ; teeth of the upper 



jaw in two series, with the addition of 



canine-like teeth ; vomerine teeth 8. Citharus, p. 418. 



Eyes on the right side. Scales of moderate 

 size ; lateral line straight 9. Brachypleuka, p. 419. 



Eyes on the right side. Scales small. Fins 



prolonged 10. Samaris, p. 419. 



Eyes on the right side. Scales small ; late- 

 ral line without curve. Fins not pro- 

 longed 11. PSETTICHTH YS, p. 420. 



Eyes on the left side ; teeth in a single 



series, of imequal size ; vomerine teeth 



none ; lateral line straight 12. Cithariciithys, p. 420. 



Eyes on the left side ; teeth of the upper 



jaw in a double series, with canines ; 



vomerine teeth none ; lateral line nearly 



straight 13. Hemirhombus, p. 422. 



Eyes on the left side ; interorbital space 

 not concave ; teeth m a single series, un- 

 equal in size ; vomerine teeth none ; 

 lateral line with a strong curve 14. Pseudoriiombus, p. 423. 



Eyes on the right side ; lateral line with a 



strong curve 15. Paralicutiiys, p. 431 . 



Eyes on the left side, more or less distant 

 from each other ; interorbital space con- 

 cave ; teeth in a single or double series ; 

 lateral line vfith a strong curve 16. Rhomboidichthys, p. 431 . 



II. Cleft of the t?wuth narrow, with the dentition much more developed on the 



blind side than on the coloured. 



A. The upper eye is not in advance of the lower ; both pectorals present. 



The dorsal commences above the eye ; teeth 

 of moderate size 17. Pleuro.n'ECTES, p. 438. 



