116 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



which shows the retractively curved axial riblets on the outside. This 

 lamella does not extend to the outer edge of the whorls of the basal 

 chondroid plate, but leaves a space there separating the turns. 



Type species: Chondropoma snhreticulatiim Maltzan = Klattea sub- 

 reticulata ( Maltzan ) . 



This genus differs from Kisslingia in its completely diiiferent outline; 

 it has, however, like Kisslingia, a simple peristome and a pseudolamella. 



KEY TO THE SPECIES OF KLATTBA 



Spiral sculpture on the last whorl strong subreticulata 



Spiral sculpture on the last whorl feeble. 



Axial ribs fine capillacissima 



Axial ribs strong capillacea 



KLiATlTEA SUBBETICUL,AT.4 (Maltzan) 



Plate 16, Figure 7 



1888. Chondropoma subreticulatum Maltzan, Nachr. deutschen malak. Ges., vol. 



20, pp. 181-182. 

 1888. Chondropoma subreticulatum var. sericea Maltzan, Nachr. deutschen malak. 



Ges., vol. 20, p. 182. 

 1920. Chondropoma (Chondropomorus) subreticulatum Henderson and Bartsch, 



Proc. U. S. Nat. Mus., vol. 58, p. 61. 



Shell of moderate size, elongate-conic, pale horn-colored, inconspicu- 

 ously marked with interrupted narrow spiral bands of brown. Nuclear 

 whorls decollated in all our specimens. Postnuclear whorls well rounded, 

 narrowly shouldered at the summit, and marked by slender, rather regu- 

 lar, threadlike, retractively slanting axial riblets, which are more dis- 

 tantly spaced on the early whorls than on the last. On the latter the 

 spaces that separate them are about one and one-half times as wide as 

 the ribs, while on the first turn the intercostal spaces are about three 

 times as wide. Of these riblets, 6o occur on the first of the remaining 

 turns, loo on the second, 142 on the third, and 156 on the last. These 

 riblets become slightly expanded at the summit and occasionally two be- 

 come fused here, but they do not form conspicuous tufts. The spiral 

 sculpture consists of obsolete, low threads, too faint to be counted. These 

 render the axial riblets slightly sinuous. Suture well constricted, rendered 

 shghtly sinuous by the axial ribs. Periphery slightly inflated, well 

 rounded. Base moderately long, openly umbilicated, and marked by the 

 continuation of the axial riblets and faint spiral threads. Within the 

 umbilicus the spiral threads become a little more distantly spaced and a 

 little more strongly developed. Last whorl solute for about one-twentieth 

 of a turn. Aperture oval, peristome simple, slightly expanded and slightly 

 reflected. Operculum paucispiral with the nucleus halfway between sub- 

 marginal and subcentral, marked by retractively slanting, slender lamellae 

 which are fused on the inner border and also on the outer; the outer 



