356 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



mens and less inflated, the anterior truncation relatively wider. 

 Comparative dimensions, in millimeters, are as follows: 



M. cranium: Height, 23; width, 18; diameter, 18. 

 M. novangliae: Height, 15; width, 13; diameter, 8. 



TyjJe locality. — U. S. Fish Commission station 2682 off Marthas 

 Vineyard, in 137 fathoms, green mud, bottom temperature 47.5° F. 



In other respects the variety agrees fairly well with the European 

 form. 



Another variety, ohlonga, is noted by Jeffreys in his collection, in 

 which the shell is elongated and narrow, tliough still symmetrical; 

 but this hardly exceeds the mutation to be observed in any large 

 collection of a species of brachiopod. The type of this variety is No. 

 274186, from Finmark, but there are a number of other specimens 

 among those catalogued under the general designation of M. cranium. 



MACANDREVIA TENERA Jeffreys. 



Terebratula tenera Jeffreys, Ann. Mag. Nat. Hist., ser. 4, vol. 18, p. 250, 1876, 



Proc. Zool. Soc. 1878, p. 405, pi. 22, fig. 7. 

 Waldheimia {Macandrevia) tenera Davidson, Mon. Rec. Brach., pt. 2, p. 66, pi. 



12, figs. 6-10, 1887. 



Type Zoca?%.— Latitude 56° 11' N.; longitude 37° 41' W., south 

 of Greenland in the north Atlantic, in 1,450 fathoms, Valorous 

 Expedition. 



MACANDREVIA CRANIELLA Dall. 



Macandrevia craniella Dall, Proc. U. S. Nat. Mus., vol. 17, p. 722, pi. 30, fig. 1, 

 1895; Bull. Mus. Comp. Zool., vol. 43, No. 6, p. 445, 1908. 



Type locality. — U. S. Bureau of Fisheries station 3362, off Cocos 

 Island, Gulf of Panama, in 1,175 fathoms, mud, bottom temperature 

 36.8° F. One specimen. 



It somewhat resembles Waldheimia wyvilli Davidson, but is larger, 

 more solid, and wants the medial septum in the brachial valve. 



MACANDREVIA AMERICANA Dall. 



Eudesia fontaineana Dall, Proc. U. S. Nat. Mus., vol. 12, p. 231, 1889; not of 



Orbigny, 1846. 

 Macandrevia americana Dall, Proc. U. S. Nat. Mus., vol. 17, p. 721, pi. 32, figs. 



1, 4, 7, 1895; Bull. Mus. Comp. Zool., vol. 43, No. 6, p. 444, 1908. 



Type locality. — U. S. Bureau of Fisheries station 2783, off the coast 

 of southern Chile, in 122 fathoms, mud, bottom temperature 48° F. 



