360 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



The type and other specimens origmally described are of a rather 

 dark warm brown but one lot of specimens obtained by the Bureau 

 of Fisheries steamer Albatross is pure white and the contrast is so 

 well marked that a varietal name seems appropriate. There is a 

 median coil to the brachia and the cardinal process is inconspicuous. 

 Davidson's figures lla-c seem to be taken from a specimen of the 

 variety and figures 12 and 13 from the typical forms of the species. 



Pereudesia, new subgenus. 



This differs from Magellania by the incomplete foramen, broad 

 hinge area, and the presence of props to the hinge teeth in the pedicel 

 valve. It differs from Eudesia by its incomplete foramen and broad 

 hinge area, and from both by the heavy coarse structure of the shell. 



Type.— Terehratula grayi Davidson. 



PEREUDESIA GRAYI Davidson. 



Terebratula grayi Davidson, Proc. Zool. Soc, 1852, p. 76, pi. 4, figs. 1-3. 

 Terebratula {Waldhehrm) grayi Schrenck, Reisen in Amurl., p. 465, 1856. — 



Reeve, Conch. Icon. Terebratula, pi. 2, figs. 5 a-c, 1860; Journ. de Conchyl., 



vol. 9, p. 123, 1861. 

 Waldheimia grayi Davidson, Mon. Rec. Brach., pt. 1, p. 54, pi. 10, figs. 1-3, 



1886. Not of Carpenter, Suppl. Rep. Brit. Assoc, p. 636, 1864. 

 W. grayi var. transversa Davidson, Mon. Rec. Brach., pt. 1, pi. 10, figs. 4, ia-b, 



1886. 

 IMagasella gouldii Dall, in Davidson, Proc. Zool. Soc, 871, p. 307, pi. 21, figs. 



lla-c. 



Type locality. — Korea Strait in 37 fathoms. 



Cat. No. 



Locality. 



Collector. 



Number 

 of speci- 

 mens. 



1651 

 111080 

 274195 

 274194 

 110884 

 274193 

 162575 

 274196 

 274197 



Hakodate Bay, Japan 

 Hakodate Bay, Japan 

 Hakodate Bay, Japan 



Japan 



Japan 



Hirado, Hizen, .Japan 

 Hirado, Hizen, Japan 



Otaru, Japan 



Matsushima, Japan. . . 



Stimpson . 



Morse 



Morse 



Morse 



F. Stearns 



Hiras6 



Hiras6 



Morse 



Morse 



4 

 3 



Many yo. 



12 



2 



3 



3 



4 yo. 



No. 110884 represents Davidson's variety transversa, which exter- 

 nally is exactly like the red transverse variety of Terelratalia caurina 

 Gould, and the two were confomided by Cooper and Carpenter in 

 their early reports on the mollusca of the northwest coast. P. grayi 

 does not occur in the latter region, though formerly reported from 

 there, owing to the above-mentioned confusion. The cardinal proc- 

 ess is very short wide and transversely rugose. The shell is ventrally 

 uniplicate like T. caurina. 



