120 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



KEY TO THE SPECIES OF LICINA 



Outer peristome broadly expanded. 



Outer peristome adnate to the preceding turn. 



Axial and spiral sculpture very fine kobelti 



Axial and spiral sculpture not very fine. 



Axial and spiral sculpture strongly developed. 

 Umbilicus broad. 



Axial ribs and spiral threads distantly spaced.... dubia 



Axial ribs and spiral threads closely spaced rollei'' 



Umbilicus narrow habichi 



Axial and spiral sculpture not strongly developed. 

 Axial and spiral sculpture obsolete on the last 



whorl pestelensis 



Spiral sculpture obsolete onlj'- on the last whorl, .gimbiensis 



Outer peristome not adnate to the preceding turn michelensis 



Outer peristome not broadly expanded. 



Outer peristome reflected decidedly backward cayemitensis 



Outer peristome not reflected decidedly backward. 



Peristome brown evoluta 



Peristome white labeo 



LiICINA KOBELTI (MaJtzan) 



Plate 17, Figure 5 



1888. Chondroporna kobelti Maltzan, Nachr. deutschen malak. Ges., vol. 20, 



p. 180. 

 1888. Chondroporna kobelti fusca Maltzan, Nachr. deutschen malak. Ges., Vol. 



20, p. 180. 

 1891. Choanopoma kobelti, Crosse, Journ. Conchyl., vol. 39, p. 168, pi. 2, fig. S. 

 1920. Tudora (Tudora) kobelti Henderson and Bartsch, Proc. U. S. Nat. Mus., 



vol. 58, p. 77. 



Shell elongate-ovate, thin, yellowish white. Nuclear whorls 2, strongly 

 rounded, forming a very small apex, which coincides with the outlines of 

 the spire. Postnuclear whorls inflated, strongly rounded, narrowly shoul- 

 dered at the summit ; the first marked by slender hairlike riblets, which 

 are distantly spaced on the first postnuclear whorl but become more 

 closely approximated on the next turn ; on the last whorl they are sepa- 

 rated by spaces about as wide as the axial ribs. In the specimen figured, 

 164 are present on the last turn. The spiral sculpture consists of slender 

 threads a little less strong than the axial riblets. Of these, 27 are present 

 between the summit and periphery on the last whorl. The spiral threads 

 render the axial riblets minutely nodulose. Suture strongly constricted. 

 Periphery strongly rounded. Base moderately long, openly umbilicated, 

 and marked by the continuation of the axial riblets, which also extend 

 over the umbilical wall where they become sublamellar, and by 16 spiral 

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

 umbilical wall there are 18 spiral threads, which are even stronger than 

 those on the spire and base. The last whorl is slightly solute. Aperture 



^' The outer peristome is sometimes separated from the preceding turn by a narrow slit. 



