260 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



axial threads, somewhat wavy and separated by spaces of double 

 their width. These threads are somewhat more numerous upon the 

 last two whorls than upon the earlier postnuclear ones, there being 

 about six to the millimeter. At the summit of the whorls these 

 threads are somewhat tufted, two or three uniting and expanded 

 into hollow whitish bulbs, thus rendering the sutures irregularly 

 denticulate. Spiral sculpture consists of obsolete cords made visible 

 only by slight swellings at their intersections with the axial threads 

 and only observable near the summits of the early postnuclear 

 whorls. Stronger spiral cords are present on the umbilical walls. 

 The aperture is vertical, oblong-ovate, and hardly angled above; 

 the peristome is double, the inner peritreme of which is considerably 

 produced and sculptured upon its outer side in conformity with the 

 surface of the shell; the outer peritreme is but moderately expanded 

 and somewhat recurred backwards; on the inner side it is extended 

 back and covers closely the umbilicus and is adnate to the adjoining 

 whorl; above the aperture it is irregularly expanded into an ear- 

 shaped projection, which supports a siphon which points directly 

 backward and inward, ending in the space between the solute last 

 whorl and the penultimate whorl. This siphon communicates with 

 the interior of the shell through a small puncture within the aperture 

 at its posterior end. The operculum is typical of the genus. 



Type.— Cut. No. 314958, U.S.N.M., was collected by Dr. Thomas 

 Barbour in the Sierra de San Juan de los Perros, near Punta Alegre 

 in the northern part of the jurisdiction of Moron, Province of Cama- 

 guey, Cuba. It measures: Length, 16.25 mm.; greater diameter, 

 9 mm.; lesser diameter, 7.75 mm.; length of aperture within, 5.4 mm.; 

 width of aperture within, 4.25 mm. 



Some specimens are lighter in color than the type, in which case 

 the color bands are more readily observed. In no cases are these 

 color bands solid, but are broken more or less into elongated spots. 



OPISTHOSIPHON (OPISTHOSIPHON) JUDASENSE, new species. 



Plate 41, figs. 9, 10. 



The shell is elongate-ovate, the spire decollated, leaving three and 

 a half to four moderately convex whorls, the last being very slightly 

 solute. The sutures are deeply impressed and denticulate. The 

 color ranges from chestnut, in the type, to dark straw and is encir- 

 cled by a series of interrupted narrow color bands of a darker tint 

 than the background, but very indistinct in the darker specimens. 

 These encircling color bands are produced upon the expanded peri- 

 stome. The sculpture consists of fine axial threads widely spaced 

 upon the early postnuclear whorls and constantly increasing in 

 number upon the later whorls and reaching their maximum number 

 of ten to the millimeter just back of the aperture. About every 

 second or third of these axial threads are expanded at the summit of 



