230 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



last part showing the beginning of fine axial threads. Postnuclear 

 whorls inflated, strongly rounded, marked by retractively slanting, 

 slender, sublamellar axial riblets, which are of irregular strength and 

 spacing. These riblets are gathered together into tufts at the summit. 

 The spaces separating these riblets vary from as wide as the riblets to 

 four times their width. In addition to the axial riblets, the whorls 

 are marked by spiral threads, which, while slender, are nevertheless 

 rather strongly elevated. These spiral threads render the axial 

 riblets conspicuously tuberculated. The spaces enclosed between the 

 axial riblets and the spiral threads are more or less square or rectan- 

 gular pits, depending upon the approximations of the riblets. Suture 

 very strongly constricted. Periphery of the last whorl strongly 

 rounded. Base short, inflated, narrowly, openly umbilicated, strongly 

 rounded, marked by the continuations of the axial riblets and by 

 spiral threads, which are a little stronger than those on the spire. 

 These threads also render the axial riblets conspicuously nodulose. 

 There are 5 of the spu'al threads on the base between the periphery 

 and the edge of the umbilicus. On the inner umbilical wall 5 addi- 

 tional threads are present; these decrease in size from without, inward. 

 The last whorl is solute for about one-twentieth of a turn. Aperture 

 large, oval; peristome double, the outer decidedly expanded and 

 reflected, slightly channeled at the anterior angle, and somewhat 

 auriculate at the posterior angle, of almost equal width around the 

 outer lip, slightly broader at the junction of the basal and inner lip; 

 on the parietal wall the peristome is of about half the width of that of 

 the outer lip and is separated from the preceding turn by a gap as 

 wide as or wider than the width of the peristome; inner peristome 

 moderately elevated, slightly expanded and reflected. Operculum 

 paucispiral, with the nucleus halfway between subcentral and mar- 

 ginal; the outside covered with a fine granular deposit and the curved 

 parachondroid ridges. 



Gundlach cites Aguadores, near Santiago, as the type locality, 

 where he coflected it "among rubbish and below rocks." He speaks 

 of the animal as follows: "Animal pale, brownish white with a rose 

 colored tinge. The antennae of the same color but the thickened 

 apex and the snout pale brownish. The head is marked with dark 

 spots. In other examples the color is soiled white, while the head 

 has a Turk blue sheen. The tentacles are also of this color, but the 

 apex and the snout are brownish; the head is spotted with small 

 dots." We have also seen specimens from Ciudadmar (El Morro), 

 and Siboney. 



The specimen described and figured, U.S.N.M. No. 104497, is 

 probably from the type locality. It has 3.5 whorls remaining and 

 measures: Length, 10.6 mm.; greater diameter, 5.6 mm.; lesser 

 diameter, 4.5 mm. 



