182 BULLETIN OF THE 



Nassarina Bushii Dall. 



Plate XV. Fig. 12. 



Shell white, strongly sculptured, six-whorled; nucleus shining, large, swol- 

 len, of one and a half whorls, at first smooth, later assuming fine spiral striation ; 

 the remaining whorls with (on the last whorl 8-10) strong sube<|ual equidis- 

 tant spiral threads nodulous on the summit of 9 or 10 strong rounded trans- 

 verse ribs which cross the whorls; on the earlier whorls only three or four of 

 the spirals appear, and the one nearest the suture is fainter than the others; 

 the rib behind the aperture of the mature shell is somewhat swollen; the base 

 of the last whorl is constricted at the beginning of the canal, which is short and 

 sharply recurved; aperture contracted, surrounded with a thin elevated not 

 reflected continuous margin, interrupted in the adult only by the canal; outer 

 lip smooth, inner lip with three or four strong nodulous teeth; whorls rounded; 

 suture distinct but not channelled. Max. Ion. of shell, 9.0; of last whorl, 5.5; 

 of aperture, 4.0; max. lat. of shell, 3.6 mm. 



Habitat. Barbados, 100 fms.; Sand Key, Florida, 15-128 fms.; Station 5, 

 Gulf of Mexico, near Cuba, in 152-229 fms., ooze, bottom temperature 49°.5 F. 



This species is extremely like N. glyjita Bush, on a larger scale, and without 

 the pretty brown and white spiral coloration of that species. 



Nassarina columbellata Dall. 



Shell pure white, attenuated anteriorly, rather acutely conical behind, with 

 eight whorls. Nucleus two-whorled, polished, smooth, milk-white, rather large; 

 spire flatly conical with a conspicuous suture, upper whorls with about five 

 strong close-set equal threads, most conspicuous in the interspaces between the 

 numerous (on the last whorl 18) flattened transverse ribs, which cross the 

 whorls but stop short before the sutures, giving a grooved aspect to the latter, 

 which is increased by the existence of a peripheral line or space wider than 

 any of the others between the two spirals nearest the periphery; last whorl 

 attenuated toward the long canal, but not constricted as in the last species; 

 aperture long, narrow, contracted, with an elevated continuous margin, inter- 

 rupted only by the canal, which is recurved near its termination; outer lip 

 with four or five internal teeth; inner lip with five or six finer smaller ones; 

 whorls not rounded above. Max. Ion. of shell, 12.2; of last whori, 8.0; of 

 aperture, 6.0; max. lat. of shell, 4.5 mm. 



Habitat. U. S. Fish Commission Station 2367, off Cape Catoche, Yucatan, 

 in 124 fms., sand. 



The upper whorls of this shell are flattened and sculptured much like those 

 of Columbella similis or translirata. 



