34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I39 



MEASUREMENTS IN MILLIMETERS 



Type.— Holotype, U.S.N.M. 549382. 



Horizon and locality. — Miocene, Station 69, on coast, 4^ miles west 

 of Gettysburg, Washington. 



Discussion. — This is a large and distinctive species unlike any 

 figured by Hertlein and Grant (1944) in their monograph on the 

 Tertiary and Recent brachiopods of the west coast of the United 

 States. Tentative assignment to Eohemithyris is made because the 

 exterior is smooth, dental plates are present, but a median septum or 

 ridge is absent. The species differs from E. alexi in its greater size 

 and more pronounced fold and sulcus. 



Genus NEOHEMITHYRIS Yabe and Hatai 1934 



Plate 13, B 



Neohemithyris Yabe and Hatai, Proc. Imp. Acad. Japan, vol. 10, No. 9, p. 587, 

 1934; Hatai, Sci. Rep. Tohoku Imp. Univ., ser. 2 (Geology), vol. 20, p. 210, 

 1940. 



Yabe and Hatai (1934, p. 587) described their new genus Neo- 

 hemithyris with type species (by original designation) Rhynchonella 

 lucida Gould as resembling Hemithyris "in shape, folding, beak 

 characters and microstructure" but differing "only in possessing an 

 entire foramen and conjunct deltidial plates in the ventral valve." In 

 the brachial valve a cardinal process is absent and no median ridge 

 is present. Although these characters do distinguish Neohemithyris 

 from Hemithyris they do not differentiate the Japanese shell from 

 Basiliola with which it seems to be identical. Consequently I have 

 placed Neohemithyris in the synonymy of Basiliola. [For further dis- 

 cussion see under Basiliola; see also pi. 13, B, figs. 6-23, for illus- 

 trations of Rhynchonella lucida Gould type species of N eohemithyris 

 ( = Basiliola).] 



Genus NEORHYNCHIA Thomson, 1915 



Plate 2, B 



Neorhynchia Thomson, Geol. Mag., n. s., dec. 6, vol. 2, p. 388, 1915; Dall, Proc. 

 U. S. Nat. Mus., vol. 57, p. 290, 1920; Thomson, New Zealand Board Sci. 

 Art, Manual 7, p. 149, 1927; Hertlein and Grant, Publ. Univ. California, 

 Math, and Phys. Sci., vol. 3, p. 57, 1944. 



Pentagonal in outline, with the greatest width at midvalve ; valves 

 unequal in depth, the pedicle valve having the greater depth ; anterior 



