V °l I 889. 11 '] PROCEEDINGS OF THE NATIONAL MUSEUM. 301 



notch wide, rounded ; fasciole slightly raised, not strongly differentiated ; 

 body with a thin transparent glaze; pillar strong, obliquely truncate, 

 flaring, almost pervious, anteriorly more or less tinged with pale 

 orange ; canal long, thin, shallow, slightly recurved ; outer lip prom- 

 inent below the periphery, thin, sharp ; maximum longitude of shell, 80; 

 maximum latitude, 35 mm . 



Operculum at first shaped like that of Volutopsis, tbe nucleus apical 

 but the succeeding growth showing a tendency to a slight spirality; 

 with subsequent growth this becomes inclosed by additions made all 

 around the margin, and the adult operculum appears buccinoid, having 

 a buccinoid outline, in the lower right hand part of which the nuclear 

 part is inclosed. This singular form of operculum is not a deformity, 

 but is common to several of the species of Leucosyrinx in which I have 

 been able to examine this appendage. It is a feature which by grad- 

 ual stages, represented by different species, approaches the normal 

 Pleurotomoid operculum. 



Hab. — U". S. Fish Commission Station 2788, in 1,050 fathoms, green 

 mud, off the northwest coast of Patagonia, south latitude 45° 35', west 

 longitude 75° 55', 3 degrees south of Chiloe Island ; bottom temperature 

 36° 9 F. 



This fine species recalls, in its general form and appearance, the in- 

 operculate Mangilia (Aforia) circinata Dall, from Bering Strait and the 

 Arctic Ocean. The soft parts were destroyed by desiccation before 

 reaching me. 



Leucosyrinx (Goodei var.?) persimilis sp. nov. 

 Plate vi, Fig. 3. 



Shell resembling the preceding species except in the following par- 

 ticulars: It is more slender and of pure white, the peripheral cariua is 

 more anterior, the anal notch consequently wider, and the fasciole is 

 not elevated; the peripheral carina is narrower and more distinct, but 

 the sulcus behind it is much fainter; the pillar is thinner and so coiled 

 as to be axially pervious to the very apex; the canal is not quite so shal- 

 low, and there is no color on the pillar or in the throat ; the spiral sculp- 

 ture is finer and more distinct. Maximum longitude of shell, 80; max- 

 imum latitude, 30 nH ". 



Operculum slightly more elongate, but in structure like that of the 

 preceding species. 



Hab.— U. S. Fish Commission Station 2791, latitude 38° 8' S., longi- 

 tude 75° 53' W., off the southwest coast of Chili, in 677 fathoms, mud ; 

 bottom temperature 37°.9 F. ; and Station 2793, iu 741 fathoms, off the 

 coast of Ecuador, in north latitude 1° 03', west longitude 80° 15'; bot- 

 tom temperature 38°. 4 F. 

 -This species is remarkably like the L. Goodei, but in a fair series the 

 differences seem constant enough to deserve a name. The soft parts 

 are whitish ; the tentacles stout and blunt ; there are no eyes or pedi- 



