CALLIOSTOMA. 353 



impressed. Surface covered with narrow, closely beaded spiral lira^ 

 alternately larger and smaller, the interstices showing rather strong 

 lines of increment. There are 6 principal spirals on the last, the 

 penultimate and next earlier whorls. The penult, and last whorls 

 each have an intermediate smaller spiral in each interstice. There is 

 a slightly larger spiral just above the periphery ; and the peripheral 

 carina is formed of a pair of contiguous riblets ; the base is nearly 

 flat, with 12 subequal concentric spirals, slightly beaded by the light 

 lines of increment. Aperture rhombic, bluish, nacreous and lightly 

 sulcate within ; lip sharp; columella cylindrical, a little curved, its 

 face pearly, ending below in a slight point. 

 Alt. 15, diam. 13* mill. 



Off East Coast S. America, 0-20 fms. 



a rioensis Ball, Proc. U. S. Nat. Mus. 1889, t. xii, f 5 (1890). 

 Closely allied to the shell herein described as C.jiieundum Gould. 



C. TiNCTUM Watson. PI. 16, figs. 11, 11a. 



Shell small, conical, high spired, flatly rounded on the base, 

 sculptured, creamy white, with faint chestnut specks. Sculpture : 

 longitudinals — there are wrinkled lines of growth above, and on the 

 base fine hair-like striae. Spirals — there are strong threads parted 

 by slight furrows, 10 above the periphery on the last whorl, 6 on the 

 penultimate whorl, between the second and third threads above the 

 periphery a slightly broader and more distinct furrow occurs ; all 

 the threads are closely packed, with rather coarse round tubercles; 

 the edge of the base is pretty shariily angulated; the angulation be- 

 comes blunt and rounded toward the mouth ; on the base there are 

 10 flattish, somewhat, unequal untubercled threads parted by very 

 shallow and narrow furrows, which become, somewhat stronger to- 

 ward the pillar. Color creamy, sparsely speckled with small pale 

 chestnut-colored dots. Spire rather high, conical. Apex a little 

 coarse, but small, consists of 1=} embryonic whorls, of which the tip 

 is red and elevated, somewhat coarsely but regularly honeycombed. 

 Whorls 6], conical, with flattened slopes of slow regular increase; 

 the last, which is not large, is angulated at the periphery, descends 

 at the moutn, and has a flatly conical, slightly convex base. Suture 

 small, but coarse, and a little impressed. Mouth very oblique, but 

 with a perpendicular pillar; it is nearly square in form; there is 

 very little nacre within. Outer lip thin ; at its insertion it is a good 

 deal drawn in on the base of the shell ; it is patulous on the side, 

 23 



