THE CTCLOPHORID LAND MOLLUSK-9 OF AMERICA 261 



This species resembles A. (A.) redfleldi. It has the suture much 

 more profoundly impressed and the median basal dark band more 

 nearly on the middle of the base. 



APEROSTOMA (APEROSTOMA) REDFIELDI, new species 



Plate 38, Figtjees 10-12 



Shell small, helicoid. The upper surface is dark chestnut-brown. 

 There is a broad light band immediately above the periphery, while 

 below the periphery there is a broad dark chestnut-brown band about 

 twice as wide as the light zone above, and a second narrow band occu- 

 pies the base a little posterior to the middle. The rest of the base is 

 olivaceous, with a brownish tinge; interior of the aperture bluish 

 white. The nucleus consists of about 2 well-rounded, smooth turns. 

 The postnuclear whorls are well rounded ; the last one is appressed as 

 a feeble cord at the summit, below which there is an impressed groove. 

 The postnuclear whorls are marked by feeble, poorly developed axial 

 riblets which are of irregular size and spacing. On the last part of 

 the last turn they become quite obsolete. The summit of the last whorl 

 falls slightly below the periphery of the preceding turn. Periphery 

 obscurely angulated. Base narrowly umbilicated, inflated, strongly 

 rounded, and marked by the continuation of the axial ribs, which do 

 not appear to grow stronger on the umbilical wall. Aperture almost 

 circular, slightly angulated at the posterior angle ; peristome simple ; 

 the outer lip sharp ; the inner slightly thickened. The parietal wall is 

 covered by a thick callus, which is separated from the preceding turn 

 by a strongly impressed groove, which renders the peritreme complete. 



The type, U.S.N.M. No. 307399, comes from Brazil. It has 4.5 

 whorls and measures : Height, 14.5 mm. ; greater diameter, 23.6 mm. ; 

 lesser diameter, 16.7 mm. Height of aperture, 8.5 mm.; diameter, 

 10.3 mm. 



This species is very closely related to A. {A.) holimense but has the 

 height of the aperture proportionately smaller. The color band also 

 occupies a different position. In A. {A.) holwiense it is on the middle 

 of the base, while in this species it is more posterior. A. (A.) holi- 

 men^e also has the suture much more strongly impressed. 



APEROSTOMA (APEROSTOMA) CURRANI, new species 



Plate 38, Figures 1-3 



Shell helicoid, soiled white when denuded. The fragments of the 

 periostracum remaining in the specimen before us show a golden- 

 brown tint on the upper surface with a dark subperipheral band on 

 the base. The nuclear whorls are decollated in our specimen. The 

 postnuclear whorls are well rounded and marked by retractively 



