"^"im'''] PROCEEDINGS OF THE NATIONAL MUSEUM. 351 



edge; surface otherwise closely sculptured by incremental striie, which 

 run at right angles to and cross the longitudinal plicte. Base concave, 

 radiately closely lamellose plicate ; plic;e sharply defined and becoming 

 more prominent as they approach tlie periphery, flattening, coalescing 

 and sinuously curving at tlic edge, which latter is followed by a shal- 

 low sulcation or groove parallel to and just back thereof; this groove 

 commences at the point wliere the upper edge of tlie outer lip joins 

 the basal whorl and extends towards the lower edge of the aperture, 

 where it is less distinct. Aperture obliquely subangulate, outer edge 

 black, thin, crenulated, nacreous, silvery white toward the edge, bright, 

 lustrous golden-yellow within and aiound the umbilical region, which 

 latter, though deeply excavated, is not open. Columella white, cal- 

 loused, arcuated, with a moderately conspicuous rounded rib bounding 

 the umbilical depression, and tca^ninating in a single tubercle. A shal-. 

 low furrow then follows the inner rib, terminating in a notch just below 

 the tubercle, and the umbilical region is still further characterized by 

 an exterior or outer rib, part of the way double, of a brilliant orange, 

 which color blends in, more or less, ah)ng the edges of the rib, to the 

 bright yellow around it. A shallow furrow follows along the course of 

 this outer rib also, becoming obsolete toward the a])erture. The base 

 of the shell is further sculptured, rather obscurely, by faint revolving 

 lines. 



Dimensions: Altitude, .36.0; diameter, maximum, 34.0 millimeters. 



The above species combines the sculptural features of the Japanese 

 Chlorostomas and the West American UvnniUas^ more especially U. 

 olivacea. It is a much handsomer shell than the latter, and geograph- 

 ically the most northerly species of the group thus far detected on the 

 west coast. It is numbered in the register of the department 125314. 



Family TROCHID^. 



GeuuH CHLOROSTOMA Swuinson. 



Chlorostoma gallina, var. multifilosa Stt-aras. 



PI. L, Figs. 8, 9. 



Preliminary description, "Nautilns," December, 1892. 



Siiell imperforate, large, heavy, solid, thick, turbinate, elevated, in- 

 flated, globosely conical, with five and one-half to six and one-half 

 whorls; whorls rounded; suture simple, moderately distinct, not chan- 

 neled; apex obtusely pointed, eroded, and yellowish at the tip; color 

 nearly black when wet, reddi.sh or purplish black, when dry; sculpture 

 spiral, consisting of numerous narrow, closely set, rounded ridges or 

 costae, separated by narrower incised whitish thread-like grooves; 

 aperture rounded, oblique, subangulate on the columellar side and 

 pearly within ; outer edge black-rimmed, finely crenulated and mottled 

 by the projection of the lighter colored grooviugs; columella short, 



