368 PROCEEDINGS OF THE NATIONAL, MUSEUM Vol.89 



ANNULARIA (ANNULARELLA) R5MERI (Pfeiffer) 



Plate 49, Figures ^1^6 



1864. Cyclostonius romeri Pfeiffer, Malakozool. Blatter, vol. 11, p. 105. 



1866. Cyclostomus romeri Pfeiffer, Mon. Conch., vol. 2, pp. 277-278, pi. 68, 



figs. 10-11. 

 1890. Colobostylus roemeri Crosse, Journ. de Conchyl., vol. 38, p. 302, in part. 

 1920. Tudora {Tudorellata) roemeri Henderson and Babtsch, Proc. U. S. Nat. 



Mus., vol. 58, p. 75. 



Shell very broadly elongate-conic, almost turbinate, straw colored, 

 with a watered-silk effect ; the early whorls are usually darker than the 

 rest; the peristome is yellowish white; the interior of the aperture is 

 pale orange. Nuclear whorls 2, well rounded, microscopically granu- 

 lose, except for the last portion of the last turn, which shows the 

 beginning of the postnuclear sculpture. Postnuclear whorls inflated, 

 strongly rounded, the first marked by retractively curved axial 

 threads; on the second and the remaining turns these axial tlireads 

 become accentuated into sublamellar threads, and between them finer, 

 irregularly developed threads are present. The stronger axial ribs are 

 slightly expanded at the summit and are adnate to the preceding 

 turn. It is this arrangement which gives to the shell a regularly conic 

 aspect. Suture not channeled. Periphery obsoletely angulated. 

 Base short, well rounded, openly umbilicated, and marked by the 

 continuation of the axial sculpture. A strong spiral cord marks the 

 junction of the base and the umbilicus, and another a little weaker is 

 immediately anterior to it, while on the umbilical wall fine obsolete 

 spiral threads are present as well as the somewhat enfeebled continua- 

 tion of the axial sculpture. Aperture oval; peristome obsoletely 

 double, the inner forming somewhat of a ridge at the posterior angle 

 and on the inner lip, and melting into the outer on the outer lip; the 

 outer broadly, flaringly expanded, of about the same width all around 

 and adnate to the preceding turn on the parietal wall. Operculum 

 typically annularid. 



U.S.N.M. No. 356282 was collected by Jeanneret at Salto del Indio, 

 between Rio Yumuri and Punta de Maisi, Oriente Province. It has 

 4 whorls remaining, having lost a fraction of the first turn, and 

 measures: Length, 10.5 mm.; greater diameter, 9.7 mm.; lesser diam- 

 eter, 7.6 mm. 



Gundlach says of the animal (published by Pfeiffer, loc. cit) : 

 "Animal pale with white dots gathered in spots on the foot. Head 

 white from the base of the tentacles to the neck. Forehead with a 

 dark transverse streak. Feelers cinnabar red with dark apex." 



