290 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 67. 



The small duplex angular flexure in front, with the smooth surface, 

 distinguish this from any other known recent species. An exactly 

 similar bipiication exists in llhynclhonella salpinx Dall, of the Eocene 

 of Wilmington, North Carolina, a fact of which Dr. J. Allan Thomson 

 has expressed himself skeptical.* If ventral uniplication is gener- 

 ically 'important perhaps this peculiarity may be worthy of a sec- 

 tional name. 



Genus NEORHYNCHIA Allan Thomson. 



Neorhynchia J. Allan Thomson, Geol. Mag., n. e. dec. 6, vol. 2, p. 388, Sept., 1915. 



Shell ventrally uniphcate, foramen hypothyrid. 

 Type. — N. streheli Dall. 



NEOKHYNCHU STREBELI Dall. 



Hemithyris strebeli Dall, Bull. Mus. Comp. Zool., vol. 43, p. 441, 1908. 



Type locality. — U. S. S. Albatross, station 4721, in mid-Pacific, 

 in 2,084 fathoms, ooze, bottom temperatm-e 35° 1 F. 



In this species the foramen is below the apex of the beak, when 

 complete, but the apex is usually worn off by friction through the 

 animal turning on its pedicel, which is very short. I am inclined to 

 think that this is the explanation of all the supposed epithyrid fora- 

 mina of the recent Rhynchonellids, 



Genus BASILIOLA Da!!. 



Basiliola Dall, Bull. Mus. Comp. Zool., vol. 43, p. 442, 1908. 

 5asioia Allan Thomson, Geol. Mag., n. e., dec. 6, vol. 2, p. 390, 1915. 



Type. — B. heecheri Dall, 1895, Hawaiian Islands. 



BASILIOLA BEECHERl DaU. 



Hemithyris heecheri Dall, Proc. U. S. Nat. Mus., vol. 17, p. 717, pi. 31, figs. 1, 2, 



3, 4, July, 1895. 

 Basiliola heecheri Dall, Bull. Mus. Comp. Zool., vol. 43, p. 442, 1908. 



Type locality. — Hawaiian Islands. 



« Geological Magazine, n. s., dec. 6, vol. 2, p. 388, 1915. 



