No. 2314. 



LIST OF RECENT BRACHIOPODA—DALL. 



293 



The specimens from the cold water off Kamchatka were much 

 coarser and more solid than the others, but otherwise similar. A 

 considerable proportion of the specimens are more or less distinctly 

 bilobed, this condition not being accidental, as supposed by Doctor 

 Thomson, while others show hardly a trace of lobation. Both valves 

 are medially more or less concave, the sulcation, if it may be called 

 so, being "opposite." It is much less evident in specimens from 



colder water. 



Genus ATRETIA Gwyn Jefifreys. 



Cryptopora Jeffreys, Nature, vol. 1, p. 136, Dec. 2, 1869; not Cryptoporus Mot- 



schulsky, 1858 (Coleoptera). 

 Atretia Jeffreys, Proc. Royal Society, No. 121, p. 421, 1870; Ann. Mag. Nat. 



Hist., Sept., 1876, p. 251; Proc. Zool. Soc. London, Apr. 16, 1878, p. 412, 



pi. 23, fig. 4, a-c. — Davidson, Mon. Rec. Brach, pt. 2, p. 173, pi. 25, figs. 



6-13, 1887. Not Atretium Cope, 1861. 

 Neatretia Fischer and Oehlert, Exp. Sci. Travailleur et TalisTnan, p. 122, 1891. 



Type. — A. gnomon Jeffreys. 



Current nomenclatorial usage would reject Cryptopora as homony- 

 mous with Cryptoporus, but whether the practice would extend so 

 far as to reject Atretia on account of Atretium is more doubtful. 

 My own feeling is in favor of retaining Atretia as valid. 



ATRETIA GNOMON Jeffreys. 



Cryptopora gnomon Jeffreys, Nature, Dec. 2, 1869, p. 136. 



Atretia gnomon Jeffreys, Proc. Roy. Soc, No. 121, p. 421, 1870. — Davidson, 



Mon. Rec. Brach., pt. 2, p. 173, pi. 25, figs. 6-13, 1887. 

 Neatretia gnomon Fischer and Oehlert, Exp. Sci. Travailleur et Talisman, 



p. 122, fig. 11 a-c, 1891. 



Type locality. — North Atlantic, northwest of Ireland. 



Cat. No. 



206479 

 173631 



173627 



173626 



173625 



173624 



130340 



46150 



44911 



46149 



83131 



274138 



274139 



■ 94367 



336894 



Off Tromso, Norway, 650 fathoms 



I North Sea 



I Northwest of Ireland (cotype) 



i North Atlantic 1,785 fathoms 



I Davis Straits, 1,000 fathoms 



i Davis Straits, 1,450 fathoms 



I North of Azores, 2,200 fathoms 



I South of Marthas Vineyard, 1,537 fathoms. . . . 



j South of Marthas Vineyard, 1,525 fathoms 



i Off Maryland, 1,594 fathoms 



Off Fowey Rocks, Florida, 205 fathoms 



Off Fowey Rocks, Florida, 100 fathoms 



Off Kev West, Florida, 120 fathoms 



Off Cuba, 780 fathoms 



Off Cuba, 150 fathoms 



The younger specimens show radial striation, which is less evident 

 or absent in the adults. 



