342 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



Gundlach says of this species (Malakozool. Blatter, vol. 3, p. 124, 

 1856) : "The animal is pale with still lighter dots; the anterior portion 

 of the neck and head are dark, and the feelers of the same color as the 

 body." 



This species comes from Pan de Guajaibon, Pinar del Rio. The 

 specimen described and figured is one of a series, U.S.N.M. No. 11023, 

 collected by C. Wright. It has 5.7 whorls and measures: Length, 7.9 

 mm.; greater diameter, 6.8 mm.; lesser diameter, 5.3 mm. 



SuBANNULARiA, new subgenus 



Small elongate-conic shells, having slender lamellose or sublamellar 

 axial ribs, which on all the whorls, or only on the early ones, bear 

 slender, elongated nodules at regularly spaced intervals. These 

 nodules give an appearance of spiral threads on the spire, which is an 

 illusion, for none are apparent in the intercostal spaces. Some of the 

 axial ribs terminate as individual cusps, or several of them may become 

 fused into a cusp at the summit. Last whorl solute. Peristome dou- 

 ble. Operculum with a very oblique, strong lamella, whose outer 

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

 plate, which leaves the turns well separated. The lamella is marked 

 by slender, retractively curved lamellae. 



Type: Annularia (Subannularia) storchi (Pfeiffer). 



KEY TO THE SPECIES OF THE SUBGENUS SUBANNULARIA 



Outer, basal, and inner lip of outer peristome crenulated. 



Axial ribs very slender lachneri 



Axial ribs not very slender jeannereti 



Outer, basal, and inner lip of outer peristome not crenulated storchi 



ANNULARIA (SUBANNULARIA) LACHNERI (Pfeiffer) 



Plate 39, Figure 9 



1861. Choanopoma lachneri Pfeiffer, Malakozool. Blatter, vol. 8, p. 223. 

 1920. Annularia (Annularia) lachneri Henderson and Bartsch, Proc. U. S. 

 Nat. Mus., vol. 58, p. 73. 



Shell small, elongate-conic, flesh colored. Nuclear whorls decol- 

 lated in all our specimens. Postnuclear whorls inflated, strongly 

 rounded, marked by retractively slanting, wavy, threadlike axial rib- 

 lets, which are more or less grouped in series. The series do not pos- 

 sess a definite number of these threads. Of these riblets 52 occur on 

 the first whorl, 76 on the second, 86 on the third, and 104 on the last. 

 The spiral sculpture consists of very fine microscopic striations, which 

 are best seen between the riblets. Suture strongly constricted. 

 Periphery inflated, strongly rounded. Base moderately long, in- 

 flated, strongly rounded, openly umbilicated, marked by the continu- 

 ation of the axial riblets and by 5 obsolete spiral threads on the um- 

 bilical wall. Last whorl solute for a little more than half a turn. 



