42 BULLETIN OF THE 



tion of the pillar lip, and tho aperture is about as wide as high, and less dis- 

 tinctly rectangular. Alt. 5.5. Lat. of base, 4.5. Lat. of aperture, 2.0 mm. 



Station 47, 3:U fms. 



This little species recalls the last in many features, but the differences in 

 sculpture and umbilicus are so great that it seems inadvisable to unite them 

 without a coiuiecting series. 



Margarita filogyra n. s. 



Shell white, or brownish white, but little nacreous, except when decorti- 

 cated ; suture appressed, not conspicuous ; whorls six, the first two and a half 

 smooth and glassy, the others, on the upper surface, supjdied with four carinsp, 

 extending from the periphery half-way in toward the suture ; the space be- 

 tween the inner carina and the suture sculptured with fine even radiating 

 ridges, striated by the lines of growth, underneath which are a few inconspicu- 

 ous longitudinal threads ; on passing over the inner carina these ridges be- 

 come about three times as numerous, and so continue over the whorl, the base 

 being supplied with about eighteen smooth, fine, even, close set revolving 

 lines ; the radiating lines or fine ridges are almost obscurlid until they pass 

 into the umbilicus, where they appear as striations on its walls. The umbili- 

 cal rib is not nodulated ; the sides of the umbilicus are so straight that they 

 look concave above the rib, and the perforation is visible to the apex, though 

 not wide or funnel-shaped. The base of the shell is full and rounded, the 

 pillar lip emarginated, and the aperture almost round ; there is no reflection 

 or callus, except that in adult shells the outer lip is a little thickened, while in 

 young ones it is slightly emarginated by the ends of the carinse. Alt. 6.75. 

 Lat. of base, 8.0 ; of aperture, 4.0 ; of umbilicus, 1.5 mm. 



Off Cuba, Pourtales, 200 fms. Station 20, 220 fms. Yucatan Strait, 

 640 fms. 



This recalls the M. groenlandica in some respects. 



Margarita (Ttircicula) imperialis n. s. 



Shell with five (?) whorls, globosely conical, white, extremely thin ; umbil- 

 icus reduced to a mere chink under the thin callus of the upper part of the 

 pillar lip. Mouth rounded rectangular, pillar somewhat concave, margins all 

 thin ; base flattened convex, with seven revolving ribs, the outermost of which 

 is just within the periphery, cro.ssed by radiating lines of growth, regular and 

 very fine, but raised into low, very sharp lamellae, which pass over the pe- 

 riphery on to the upper surface of the whorl ; the last is provided with two 

 strong revolving ribs, one of which forms the periphery, while the other lies 

 a little less than half-way from the first toward the suture ; two indistinct 

 threads run in the vicinity of the suture ; on the revolving ribs above men- 

 tioned there are regularly disposed sharp rough tubercles (seventeen on the 

 last whorl), most prominent on the middle carina ; the above-mentioned 



