346 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



(?and9- Salem, Mass. C.F. Putnam. (Teeth movable.) 



(7 young*). Bucksport, Me. 

 (half-grown). Portland, Me. 



C. G. Atkins. (Teeth tixed.) 

 Summer, 1872. (Teeth fixed. ) 



Talve the most salieut cliaracters of tlie genus EucJialarodus — the mov- 

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

 tions may be observed in Pleuronectes glaber and P. platessa. Eucliala- 

 rodus Piifnami, in fact, is the male of Pleuronectes glaber, 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 exam]iles of Pleuronectes platessa 

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

 after all might be ai^plied to the species of Pleuronectes with movable 

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

 the upper 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 in this examination are as follows: 



.5368. Types (2) of EuchalarodtiH Putnami. Salem, Mass. Putnam. (Teeth of larger 



movable. ) 

 20910. Plcnronccies (jlaher, $ . Portland, Me. Tarleton H. Bean. (Teeth movable.) 

 20920. „ 



20954. „ 



14857. „ 



14G59. „ 



14GG2. „ 



14666. „ 



14667. „ 

 14669. „ 



14673. „ 



14677. „ 



14678. „ 



14679. „ 

 14381. „ 

 14682. „ 

 14G83. „ 

 14G84. „ 

 14G85. „ 

 14658. „ 

 14G61. „ 

 14G63. „ 



14664. „ 



14665. „ 

 14671. „ 

 14672. 



14674. „ 

 20873. 



(adult 9). 



20954. 



(1 $ and 2 9). 

 (3 spent 9 ). 



„ „ Dec. 



Bucksport, Me. Mar. 



15, 1877. 

 4, 1878. 



(Teeth mov- 

 able. ) 

 (Teeth transi- 

 tional. ) 



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

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

 are tixed. 



Vi02d. Pleuronectes platessa. Kiel. Dr. Mobins. (Teeth fixed.) 

 100^1- » „ Christiania, Norway. E. Collett. (Teeth movable.) 

 ^^^'*^- „ „ France. Mus. d'Hist. Nat. Paris. . (Some teeth of upper 

 jaw movable.) 



' The longest of these is 140™"' in length. All have rough scales. 



