346 PROCEEDINGS OV IMTEl) SiATi-.S ^ATIONAL MUSEUM. 



i aud 9 • Salem, Mass. C. F. Putnam. (Teeth movable.) 



(7 young*). Bucksport, Me. 

 (half-grown). Portland, Me. 



C. G. Atkins. (Teeth fixed,) 

 Summer, 1872. (Teeth fixed. ) 



Take the most salient characters of the genus Eiich alar oil iis — tlie mov- 

 able teeth and scarcely perforate anterior nasal tubes — the same condi- 

 tions may be observed in Pleuronectes glaher and P. platessa. Euchala- 

 rodioi Fiitnami, in fact, is the male of Pleuronectes glaher^ and differs from 

 it only in having more of its scales ciliated. The young are like the 

 adult male in this respect. Had all the examjiles of Pleurojiectes platessa 

 exhibited movable teeth, it would have led to the belief that Uuchalarodus 

 after all might be applied to the species of Pleuronectes with movable 

 teeth, but one of them has the teeth firmly fixed, another has some in 

 the upx)er jaw movable, and a third has all the teeth reclining and freely 

 movable. The explanation of this condition is yet to be sought. 

 The materials used m this examination are as follows: 



5368. Types (2) of Euclialarodus Fidnami. Salem, Mass. Putnam. (Teeth of larger 



movable. ) 

 20910. Pleurmecics glaber, $ . Portland, Me. Tarleton H. Bean. (Teeth movable.) 

 20920. ,, 



20954. „ 



14657. ,, 

 14659. „ 

 14662. „ 



14666. „ 



14667. „ 

 14669. „ 

 14673. „ 



14677. „ • 



14678. „ 



14679. „ 



14681. „ 



14682. „ 



14683. „ 



14684. „ 



14685. „ 



14658. „ 



14661. ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, 



14003. ,, ,, ,, ,, „ ,, ,, ), ,, „ 



146o4. ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, 



146o.). ,, ,, ,, ,, ,, ,, ,, ,, ,j ,, 



14671. ,, ,, ,, ,, ,, ,, ,, ,, ,, >, 



14o/^. ,, ,, ,, ,, J, ,, ,, ,, ,, ,, 



146/4. ., ,, ,, ,, ,, ,, ,, ,, 5, ,, 



20873. ,, „ (1 J' and 2 9). „ „ Dec. 15,1877. (Teeth mov- 



able.) 



20954. .. .. (3 spent 9). Bueksport,Mo. Mar. 4,1878. (Teeth transi- 



tional.) 



It will be seen that the teeth of the adult male aud female are freely 

 movable only during the breeding season, and that those of the young 

 are fixed. 



(adult 9). 



10029. Pleuronectes 2>Jatessa. 



10061. 



21175. 



Kiel. Dr. Mobius. (Teeth fixed.) 

 Christiania, Norway. R. Collett. (Teeth movable. ) 

 France. Mus. d'Hist. Nat, Paris. (Some teeth of upper 



jaw movable.) 



*The lonsrest of those is 140"'"' in length. All have rough scales. • 



