264 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 59. 



equally so all around, somewhat fluted and coarsely, concentrically 

 sculptured with hollow ribs on its face; at the umbilical region it is 

 suddenly deflected backwards and is closely appressed into the um- 

 bilicus, completely sealing it. It is adnate to the whorl above and 

 above the aperture is further expanded into a delta shaped projec- 

 tion, deflected backwards terminating in a siphon which is projected 

 downwards into the suture just back of the aperture; the siphon com- 

 municates with the interior of the shell by a puncture just within the 

 aperture at its posterior angle. The operculum is typical of the genus. 

 Type.— Cat. No. 314963, U.S.N.M., was collected by Torre at Bo- 

 queron del Tatibonico, on the boundary between the Provinces of 

 Santa Clara and Camaguey. It is a female specimen, and measures: 

 Length, 12mm.; greater diameter, 7 mm.; lesser diamoter, 5.5 mm.; 

 length of aperture within, 3.5 mm.; width of aperture within, 2.75 

 mm. A male specimen from the same lot measures: Length, 11 mm.; 

 greater diameter, 6.5 mm.; lesser diameter, 5 mm. 



EUTUDORA (EUTUDOROPS) PARADOXUM, new species. 



Plate 42, figs. 8, 9. 



The shell is elongate-ovate, the apex usually decollated, leaving 

 four to four and a half rather convex whorls, the last slightly solute. 

 Sutures deeply impressed; umbilicus closed by an expansion of the 

 peristome. The color is white, sometimes with a slight yellowish 

 cast, and having six to eight encircling bands of light chestnut spots; 

 some specimens having no color markings whatever. The sculpture 

 consists of axial sublamellar riblets, widely spaced upon the earlier 

 postnuclear whorls, and densely crowded upon the last whorl, where 

 they become threadlike; at the summit of the whorls the riblets are 

 expanded in varying degrees into hollow, narrow bulbs and irregu- 

 larly crenulate the sutures; spiral sculpture consists of more or less 

 obsolete cords, not always to be distinguished, but generally indicated 

 by prominences upon the axial riblets at their points of intersection. 

 On the umbilical wall the spiral cords are more prominent. The ver- 

 tical aperature is almost round, without angle above; the inner peri- 

 treme is strongly projecting; the outer peritreme consists merely of a 

 slightly exaggerated axial riblet, between which and the rim of the 

 aperture are seven or eight normal axial riblets. The outer peritreme 

 is slightly more expanded on the inner side and is suddenly deflected 

 backward to cover and seal the umbilicus well within the umbilical 

 opening, and is adnate to the whorl above; a small expansion above 

 the aperture is bent backward to form a siphon which projects into 

 the space behind the solute portion of the last whorl; the siphon com- 

 municates with the interior of the shell through a puncture just within 

 the aperture in its posterior portion. The operculum is typically 

 Tudoroid, the lamellae springing from the chondroid plate being bent 



