316 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



has a little over 5 whorls and measures: Length, 13.7 mm.; greater 

 diameter, 7.7 mm.; lesser diameter, 5.6 mm. 



This species is easily distinguished from the rest by its broadly 

 expanded peristome and by having the parietal wall of the peristome 

 adnate to the preceding turn instead of being solute. 



ANNULAKIA (DIPLOPOMA) RAMSDENI, new species 



Plate 35, Figure 7 



Shell very large, elongate-conic, chestnut-brown, with the summit 

 of the turns soiled white. The umbilical wall and the peristome are 

 white with a faint yellowish tinge, which is also the color of the in- 

 terior of the aperture. Nuclear whorls decollated except for the last 

 portion of the last turn, which is well rounded and minutely granulose. 

 Postnuclear turns moderately well rounded, marked by rather strong, 

 slightly wavy, almost vertical or slightly retractively curved, sub- 

 lamellar axial ribs, which become fused at the summit to form strong, 

 broad denticles which project greatly above the sutural line; 2 to 8 

 of the ribs may be united into a single denticle. Of the axial ribs, 

 37 occur on the first of the remaining turns, 41 on the second, 60 on 

 the third, 112 on the fourth, 166 on the fifth, and 235 on the last. In 

 addition to the axial ribs, the whorls are marked by quite strongly 

 developed spiral cords, which render the junction with the axial ribs 

 slightly scalloped. The spiral sculpture is absent on the first turn; 

 on the second and third 7 cords are present, on the fourth, 9; while 

 the fifth and last have 12. Suture strongly constricted. Periphery 

 well rounded. Base short, well rounded, openly umbilicated, marked 

 by the continuation of the axial ribs and 9 spiral cords, equaling those 

 of the spire in strength. On the umbilical wall 10 spiral cords are 

 present, which grow consecutively stronger from the inner toward 

 the outside, and which render the axial ribs nodulose. The last 

 whorl is solute for about one-fifth of a turn, with a decided carina at 

 the posterior angle, above which the axial ribs extend as strong cusps. 

 Aperture almost circular; peristome double, the inner slightly exserted 

 and slightly reflected; the outer thickened, rather broadly expanded, 

 fluted all around except at the posterior angle, where it forms a con- 

 spicuous auricle, and marked by concentric laminae. Operculum 

 typically diplopomid. 



The type, U.S.N.M. No. 535637, was collected by Dr. Ramsden at 

 La Pujanza, Monte Toro, northwest of Guantdnamo, Oriente Prov- 

 ince. It has 6.2 whorls remaining and measures : Length, 21.3 mm.; 

 greater diameter, 13.3 mm.; lesser diameter, 9.3 mm. 



Its splendid size will differentiate it from all the other Diplopomas. 



