620 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 41. 



EUDORELLA EMARGINATA (Kr0yer). 



Leucon emargmatus Kr0yer, Naturh Tidsskr., ser. 2, vol. 2, 1846, p. 181, pi. 1, fig. 



7, pi. 2, figs. 3a-h. 

 Eudorella emarginata S. I. Smith, Trans. Conn. Acad., vol. 5, 1879, p. 115. — 



G. O. Sars, Crust. Norway, vol. 3, 1900, p. 36, pis. 27, 28. 



This well-marked species does not seem to have been recorded 

 hitherto south of Halifax on the American coast. 



Localities. — Egg Harbor, Labrador; 7 fathoms; Owen Bryant, 

 August 10, 1908; U.S.N.M. 44106; 1 female. 



Twenty miles ESE. of Cape Sable, N. S. ; 70 fathoms; Owen Bryant, 

 October 7, 1908; U.S.N.M. 44105; 1 female. 



Albatross station 2497; lat. 45° 04' 00" N.; long. 59° 36' 45" W.; 57 

 fathoms; bottom temperature 33° F.; U.S.N.M. 38207; 12, female 

 and young. 



U. S. F. C. station 311; off Cape Cod; 16 fathoms; bottom tem- 

 perature 49° F.; U.S.N.M. 34873; 1 male. 



U. S. F. C. station 992; off Marthas Vineyard; 36 fathoms; bottom 

 temperature 48° F. ; U.S.N.M. 44104 ; 1 male. 



EUDORELLA TRUNCATULA (Spence Bate). 



Eudora truncatula Sp. Bate, Ann. Mag. Nat. Hist., ser. 2, vol. 17, 1856, p. 457, 



pi. 14, fig. 3. 

 Eudorella truncatula G. O. Sars, Arch. Math. Naturvid., vol. 4, 1879, p. 34, pis. 



30-32; Crust. Norway, vol. 3, 1900, p. 37, pi. 29. 

 Eudorella pusilla G. 0. Sars, Oefvers. Kgl. Vet. Akad. Forh., 1871, p. 79; 



Kgl. Svenska Vet. Akad. Handl., vol. 9, No. 13, 1871, p. 46, pis. 16, 17.— S. I. 



Smith, Rep. U. S. Comm. Fisheries, pt. 1, 1874, p. 554; Trans. Conn. Acad., 



vol. 5, 1879, p. 116. 



The American form which has been distinguished by G. O. Sars 

 and S. I. Smith, under the name of E. pusilla, from the European 

 E. truncatula, does not seem to me to deserve specific rank. At all 

 events, a somewhat close examination of the series from American 

 localities in the present collection has only revealed one trifling 

 character which might possibly prove to be distinctive, namely, the 

 shortness of the exopod of the uropods. In the American specimens 

 (females) this seems to be always a little shorter than the first seg- 

 ment of the endopod, while in the few European specimens at hand 

 for comparison, as in Sars' figures of E. truncatula, it is a little longer 

 than that segment. Further research is required to ascertain 

 whether this difference is constant and whether it is accompanied by 

 any others, but for the present it does not seem adequate for the 

 separation of the species. Another character presented by some of 

 the specimens in this collection is the possession of a small anteriorly 

 curved tooth on the dorsal surface of the carapace close to the hinder 

 margin of the respiratory opening. This tooth is easily overlooked, 

 and it is possible that it may be found in some European specimens. 

 In any case, it can not be regarded as a specific character, since, in a 



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