84 BULLETIN OF THE 



ture ; they extend well over the periphery of the whorl, and are evanescent 

 on the canal ; other transverse sculpture comprises only fine lines of growth 

 which are not parallel to but more oblique than the aforesaid ribs, and reticu- 

 late prettily the spiral threads ; whorls but little inflated, having a very regular 

 taper, slightly appressed at the distinct but not deep suture ; aperture more 

 than one third as long as the shell, polished within, with a deep broad notch, 

 slightly in advance of the suture, whose edges arc produced and considerably 

 reflected ; the fasciole is indistinct and little depressed; the outer lip smooth, 

 in the middle produced, internally somewhat thickened, not lirate ; canal short, 

 rather broad, somewhat recurved ; a broad, not very thick, continuous band of 

 white callus from the end of the pillar over the body passes into the reflected 

 margin of the notch ; pillar slightly curved. Lon. of shell, 25.7 ; of last whorl, 

 10.6 ; of aperture, 9.0 ; lat. of last whorl, 8.0 mm. 



Habitat. This shell came to me, labelled Station 36, 84 fms. ; that is, in the 

 Gulf of Mexico, Lat. 23° 13' and Lon. 89° 16' W.; bottom temperature, 60° F. 

 But the facies of the shell is that of deep, or at least of cooler water, and I sus- 

 pect some error has occurred. Perhaps it might have remained in the dredge 

 from the immediately preceding haul from 804 fms. 



Fragments have since turned up, in material dredged in 100 fms., at Bar- 

 bados, by the Hassler expedition. This would tend to confirm the correctness 

 of the original label. Another fragment was dredged in 101 fms., at Station 45. 



The species is very elegant in its slender taper and snowy whiteness. 



Drillia ? detecta Dall. 



Plate XII. Fig. 11. 



Pleurotoma {DrilJia) detecta Dall, Bull. M. C. Z., IX. p. 65, August, 1881. 

 Pleurotoma {Defrancia) circumvoluta Watson, Journ. Linn. Soc., XV. p. 465, Nov., 



1881. 

 Clathurella circumvoluta Watson, Kep. Chall. Gastr., p. 357, pi. xxi. fig. 1, 1885. 



Habitat. Station 43, in 339 fms., Gulf of Mexico. Off Culebra Island, 

 in 390 fms., mud. Challenger expedition. 



Mr. Watson's figure represents an immature shell, slightly more slender than 

 my type of detecta. It is quite likely that he may be right in his generic 

 reference, as my specimen does not show the Drillia varix, yet its form and 

 short last whorl seem to me more like that of a Drillia than any other group. 

 The Blake specimen was dead and lustreless. 



Drillia alesidota n. s. 



Shell large, slender, ashy brown or light brown, pointed, rudely sculptured, 

 ten-whorled, with a nucleus of about two whorls, round, small, glassy, smooth 

 and inflated ; fasciole slightly concave, nearly smooth, very steep, separated 



