374 



2. Small, nearly smooth variety. 



Mactra(Cymhophora?) Warrenana, Whiteaves. 1879. This volnme, pt. 2, p. 142, pi. 

 17, fig. 9, and pi. 19, figs. 3 and 3 a ; but perhaps not Cymho- 

 phora Warrenana of Meek and Hayden. 



Shell comparatively small, concentric ribs nearly or altogether obsolete, 

 the surface markings for the most part consisting of close-set concentric 

 striae, and from one to three distant groove-like constrictions, or periodic 

 arrests of growth. 



Specimens which the writer once thought to be possibly identical with 

 the Cymbophora Warrenana oi Meek and Hayden, but which can scarcely 

 be satisfactorily distinguished from C. Ashburneri, were collected by Mr. 

 Richardson at the Sucia Islands in 1874, and two miles and a half up the 

 Nanaimo River, V.I., in 1875. Similar specimens have since been 

 collected at the Sucia Islands by Dr. Newcombe (in 1894), and at Bren- 

 nan Creek, Y.I., by the Rev. G. W. Taylor (in 1901). 



Anatina sulcatina ? Shumard. 



Anatina sulcatina ? Shumard. 1861. Proc. Boston Nat. Hist. Soc, vol. viii, p. 204. 

 Anatina sulcatina, Whiteaves. 1879. This volume, pt. 2, p. 139, pi. 17, tigs 5 and 5 a. 

 Anatina sulcatina? Shumard. White. 1889. Bull. U. S. Geol. Surv., No. 51, p. 43, 

 pi. VI, fig. 1. 



Doctors C. A. White and T. W. Stanton are inclined to think that the 

 Sucia Island specimens that have been referred to A. sulcatina are pro- 

 bably distinct therefrom, and it is of course quite possible that this may 

 be the case, as Shumard never figured his species. An additional speci- 

 men of an Anatina that would seem to be at least very similar to A. 

 sulcatina, but that it might be convenient to distinguish provisionally by 

 the name A. affinis, was collected at the Sucia Islands by Dr. Newcombe 

 in 1894 ; and a similar one at Brennan Creek, V. I., by the Rev. G. W. 

 Taylor in 1901. 



Anatina subcylindracea. (N. Sp.) 



Plate 45, fig. 11. 



"Shell rather small, moderately convex, slightly compressed, very 

 inequilateral, straight, elongated, a little more than twice as long as high, 

 and subtruncate at both ends. Anterior side much shorter than the pos- 

 terior ; anterior end truncated almost vertically but somewhat obliquely 

 above and rounded below ; posterior end abruptly truncated and widely 

 gaping ; cardinal border long, horizontal and nearly straight, behind the 

 beaks ; ventral margin also straight for the greater part of its length and 



