CUBAN ANNULARIIDAE TORRE AND BARTSCH 355 



double, the inner and outer coextensive on the basal and anterior half 

 of the outer lip, separated by an impressed groove on the inner lip and 

 decidedly differentiated at the posterior angle, where the inner peri- 

 stome forms a conspicuous shelf, while the outer forms a decided auricle 

 which may bear a number of concentric lamellae. Both peristomes 

 are moderately expanded and reflected and arc of about the same 

 width all around except at the parietal wall, where they are a little 

 narrower. Operculum typically annularid. 



The type, U.S.N.M. No. 535663, was collected by Dr. Kamsden at 

 La Cobrera, east of Guantdnamo. It has 5 whorls and measures: 

 Length, 10.0 mm. ; greater diameter, 1 1.0 mm.; lesser diameter, 8.0 mm. 



ANNULAKIA (ANNULAREX) RAMSDENI (Pilsbry and Henderson) 



Plate 45, Figures 4-6 



1912. Annularia ramsdeni Pilsbry and Henderson, Nautilus, vol. 26, p. 42. 



1913. Annularia ramsdeni Pilsbry and Henderson, Nautilus, vol. 27, p. 37, pi. 



3, figs. 5, 6. 

 1920. Tudora {Tudorellata) ramsdeni Henderson and Bartsch, Proc. U. S. Nat. 

 Mus., vol. 58, p. 75, MS.? 



Shell very broadly turbinate, straw colored. Nuclear whorls 2, 

 well rounded, microscopically granulose, except for the last portion of 

 the last turn, which shows the beginning of the postnuclear axial riblets. 

 Postnuclear whorls very broad, inflated, strongly rounded, marked by 

 retractively slanting, sublamellar axial riblets, between which finer 

 riblets occur; this is particularly true on the middle whorl. On the 

 last turn the intercalated threads attain almost the size of the stronger. 

 The stronger riblets become slightly expanded at the summit, particu- 

 larly so on the middle whorl. There are 46 of the stronger axial 

 riblets on the first postnuclear whorl, 62 on the second, while on the 

 last they caimot be difl'erentiated from the finer threads. The finer 

 threads vary from 2 to 7. The spiral sculpture consists of feeble 

 threads, which are too poorly defined on the first postnuclear whorl to 

 be counted, 7 are present on the second, and 12 arc on the last between 

 the summit and suture. The junction of the stronger axial riblets 

 and spiral threads forms very feeble nodules, while the finer threads 

 are merely rendered slightly wavy. Suture very deeply channeled. 

 Periphery well rounded. Base short, openly umbilicated, well 

 rounded, marked by the continuation of the axial sculpture and by 

 10 spiral threads equaling those on the spire in strength. The umbili- 

 cal wall is marked by the continuation of the axial riblets, which here 

 are shghtly diminished in strength and closely crowded; 13 spiral 

 threads are present, of which the outermost is much stronger than the 

 12 within, which are of subequal strength and spacing. Aperture 

 subcircular, very oblique; peristome double, the inner and outer 



223580—40 15 



