380 PROCEEDINGS OF THE NATIONAL. MUSEUM Vol.89 



ing very rapidly in size, inflated, strongly rounded, marked by retrac- 

 tively slanting axial riblets, of which 72 occur on the first turn. On 

 the succeeding turns the axial riblets become specialized into two 

 series, one strong and sublamellar and the other weak and threadlilve. 

 Of the strong riblets, 62 occur on the second turn and 64 are on the 

 last, whUe the spaces between these riblets are marked by 2 to 7 of 

 the finer threads. Suture slightly constricted. Periphery strongly 

 rounded. Base short, inflated, strongly rounded, with a very broad, 

 almost funnellike umbilicus, marked by the continuation of the axial 

 riblets, which extend into the umbilicus, and by 3 spiral threads, of 

 which the last one marks the junction of the umbilicus and the base, 

 and it is much stronger than the other two; within the umbilicus 4 

 feeble additional spiral threads are present. Last whorl solute for 

 one-fourth of a turn. Aperture almost subcircular; peristome double, 

 the inner exserted and reflected; the outer narrowly expanded, slightly 

 fluted at the junction of the basal and inner lips, of the same width all 

 around except at the posterior angle, w^here it forms a rather broad 

 auricle. Operculum t5'^pically annularid. 



The specimen described and figured, U.S.N.M. No. 11017, is one 

 of 5 collected by C. Wright at Yunque de Baracoa, Oriente Prov- 

 ince. It has 4.9 whorls and measures: Length, 9.1 mm.; greater 

 diameter, 8.8 mm.; lesser diameter, 6.9 mm. 



ANNULARIA (ANNULARELLA) WRIGHTI, new spedes 



Plate 55, Figures 4-6 



Shell small, turbinate, pale straw colored. Nuclear whorls 2, well 

 rounded, smooth except for the last portion of the last turn which 

 shows the beginning of the postnuclear sculpture. Postnuclear whorls 

 inflated, strongly rounded, rather high, marked by strong, retrac- 

 tively slanting, sublamellar axial ribs, of which 54 occur on the second 

 and 64 on the last. These axial riblets are expanded into moderately 

 broad cusps at the summit, which do not become appressed to the 

 preceding turns. Between the sublamellose axial riblets are finer 

 axial threads which vary from 2 to 4 in number. Suture narrowly 

 channeled. Periphery well rounded. Base short, inflated, strongly 

 rounded, narrowly, openly umbilicated, marked by the continuation 

 of the closely crowded axial riblets and by 7 rather strong spiral threads 

 on the umbilical wall of which the outer is the heavier. Last whorl 

 solute for about one-fourth of a turn. Aperture broadly oval; peri- 

 stome double, the outer coextensive on the outer lip, projecting slightly 

 on the inner lip and at the posterior angle as a narrowly developed 

 auricle ; on the inner lip and at the posterior angle the inner peristome 

 is slightly exserted. Operculum typically annularid. 



