No. 2369. NEW MOLLVSKS FROM CUBA-r-TORRE AND HENDERSON. 257 



series of brown spots encircling the whorls. The sculpture consists 

 of axial sublamellar riblets, four to the millimeter, on the earlier 

 postnuclear whorls and almost double that number on the last 

 whorl, the spaces between being much wider than the riblets. A 

 mere trace of an obsolete spiral sculpture may be detected in some 

 specimens. At the sutures, every second or third riblet ends in a 

 white lamellar expansion which produces an irregular crenulation 

 along the deeply impressed sutures. There are ten to twelve promi- 

 nent spiral cords within the umbilicus. The aperture is oblong- 

 oval, obtusely angled above. The double peristome consists of a 

 scarcely projecting inner, and a moderately expanded outer, peritreme 

 The greater expansion is on the inner side but is not sufficient to 

 cover, even partially, the umbilicus, nor actually to touch the ad- 

 jacent whorl above. Over the angle of the aperture the peristome 

 expands into a delta shaped projection supporting a siphon which 

 bends back and down into the space between the solute last whorl 

 and the whorl above. The operculum is typical of the genus. 



The type, Cat. No. 314954, U.S.N.M., is a female specimen from 

 "Santa Rita" farm and measures: Length, 11.5 mm.; greater diam- 

 eter, 8.25 mm.; lesser diameter, 6.5 mm.; length of aperture within, 

 4 mm.; width of aperture within, 3.25 mm. Another specimen, a 

 male, measures: Length, 8 mm.; greater diameter, 7.25 mm.; lesser 

 diameter, 5.1 mm.; length of aperture within, 3 mm.; width of diam- 

 eter within, 2.5 mm. 



This subspecies was collected by Salustio Garcia and P. Sifonte 

 at "Santa Rita" farm near La Entrada and El Cercado; near Los 

 Cangilones by the banks of the river Maximus, all in the eastern 

 extremity of the Cubitas Mountains, Camaguey Province, Cuba. 



OPISTHOSIPHON (OPISTHOSIPHONA) EVANIDUM, new species. 



Plate 41, figs. 1-2. 



The shell is elongate-conic, with open umbilicus and apex decol- 

 lated, the last whorl being solute for a distance of 5 mm. The color 

 is white without trace of color markings of any sort in the type, but 

 showing in a subspecies a feeble tendency to encircling rows of spots. 

 The sculpture consists of axial riblets somewhat irregularly dis- 

 posed and about twice as numerous on the last whorl as upon the 

 earlier postnuclear whorls, in all cases the intervals between the ribs 

 being wider. At the summit of the whorls every second or third 

 riblet is expanded into a small inconspicuous hollow bulb , giving to 

 the suture an irregular crenulation. Within the umbilicus are about 

 ten low spiral cords. The aperture is vertical, oblong and obtusely 

 angled above; the inner peritreme of the peristone is slightly pro- 

 jecting; the outer peritreme is slightly expanded, a trifle more so on 

 the inner side, but not sufficient even partially to conceal the umbil- 

 27177— 21— ProcN.M. vol.59 17 



