376 CALLIOSTOMA. 



ril)s, of which three or four are much smaller and alternate with the 

 larger ones ; the strongest rib is just below the suture ; interstices 

 concave, brownish, glossy, obliquely striated by the lines of growth, 

 and sometimes with subordinate, revolving, raised lines. The four 

 principal ribs are continued on the upper whorls, but the intermediate 

 ones gradually disappear on the middle whorls. The nodules on the 

 ribs are prominent, rounded and smooth, whitish, and extend to near 

 the apex. Nuclear whorl smooth ; next with three carinse. Base 

 with about twelve spiral, nodulous ribs with some intermediate, 

 smaller ones ; umbilical region slightly excavated spirally. Col- 

 umella strongly concave, terminating in an indistinct tooth. Animal 

 yellowish with long tentacles, and with four long cirri on each side ; 

 eyes well developed. Dentition somewhat different from the typical 

 species of the genus ; there is no large lateral tooth, between the 

 inner and outer series ; outermost ones broad, flat, curved. Oper- 

 culum, thin, circular, with many narrow 7 whorls. (Verrill and 

 Smith.) Alt. 22, diarn. 30; diam. of aperture 15 mill. 



Of Southeast coast of New England, 65 to 252 fms. ; Florida, 100- 

 200 fms. 



Calliostoma bairdii VERRILL AND SMITH, Am. Jour. Sci., xx (3d 

 ser.), p. 396, 1880. BALL, Bull. M. C. Z. ix, p. 45 ; Blake Gasterop., 

 p. 364. C. psyche DALL, Bull. M. C. Z. v, p. 61 (not described). 

 C. bairdii, VERRILL, Trans. Conn. Acad. v, p. 530, t. 57, f. 26 ; 

 Rep. Albatross explorations in 1883 (Annual Rep. Commits. Fish it- 

 Fisheries, 1883), pi. 27, f. 96, 97. 



The name psyche Dall, may be used for the southern variety, 

 which is paler and more delicately colored, less elevated, lateral out- 

 lines slightly concave. 



C. CIRCUMCINCTUM Dall. PI. 49, figs. 33, 34. 



Shell solid, strong, white, elevated, conical, seven-whorled, 

 nucleus polished, small delicately reticulate; other whorls with two 

 sharp, much produced, thin keels a little recurved at their edges, 

 and crossed only by most delicate lines of growth ; base flattened, 

 ornamented with nine angular ribs, the outermost produced some- 

 what ; umbilicus none, aperture subrectangular, notched by the 

 keels ; pillar simple, somewhat projecting, at its anterior end not 

 callous ; suture appressed, distinct, not channelled. 



Alt. 8, diam. 6 mill. (Dall.) 



Yucatan Strait, 640 fins. 



