50 BULLETIN OF THE 



giving the aperture a downward look ; aperture ol)li([ue above, arching more 

 nearly to a perpendicular below ; snioothh', evenly re(lect(;d and thickened from 

 the jiillar to the suture, with an internal channel behind the thickening ; piUar 

 callous above, thinly and unevenly reflected half-way across the umbilicus, 

 gently and very oliliciuely descending and smoothly passing into the basal part 

 of the lip. The interior of the aperture, the lip, the umbilical callus, and a 

 slight wash near the sutural junction, brilliantly nacreous ; base and body 

 whorl witliin the mouth not so ; upper surface of shell distinctly tinted with 

 fawn color, base waxen white, the nacre perceptible through tlie thinner por- 

 tions. Alt. 24.0 ; Maj. diam. 35.5 ; of umbilicus, 8.0 ; of aperture, 13.0 mm. 

 Defl. about 100°. 



Station 153, off Montserrat, 303 fms., and from various other localities at 

 about the same depth. 



This shell, except for the nacre, at once recalls a big Helix of the alholahris 

 type. 



Callogaza Watsoni n. s. 



Shell much smaller than the last and but slightly nacreous; whorls six and 

 a quarter, having the same general form r.s in the last species, but with a more 

 prominent nucleus ; nucleus small, bidbons, dark brown ; first two and a half 

 whorls glassy, brown spotted, smooth ; subsec[uently the exterior two thirds of 

 the upper surface of the whorls sculptured with four or five strong revolving 

 threads ; the space between them and the suture above, with strong, even, flex- 

 uously radiating, shining, rounded jilications (about eight to a millimeter) 

 which pass obliquely over the revolving threads and appear again on the base 

 as strong regular plications in the umbilical region, extending from the umbil- 

 ical carina one third of the way toward the periphery. The base is covered 

 with numerous revolving threads flattened until their interspaces appear like 

 grooves ; the umbilicus similarly formed to the last species, but somewhat 

 more turreted internally. Last whorl less contracted behind the lip, which is 

 not produced forward above, as in sujpcrha ; the umbilical callus not nacreous, 

 with a granular surface, white and covering less than half the umbilicus ; lip 

 and aperture otherwise much the same as in superba, but only slightly nacre- 

 ous. Base waxy white, top the same, with cloudy radiating brown blotches 

 near the suture and on the periphery ; some of the revolving threads are also 

 continuously brown. Alt. 7.75. Maj. diam. 12.5 ; of umbilicus, 2.5 ; of aper- 

 ture, 5.5 mm. Defl. about 120°. 



Sigsbee, Station 12, 177 fms., off Havana. 



This modest little species looks very like some of Lowe's Madeiran helices. 



MICROGAZA n. subg. 



Shell flattened, rotelliform, resembling a Gum without reflected lip or um- 

 bilical callus, brilliantly nacreous when fresh, and having a distinctly scalari- 

 form umbilicus. 



