166 PROCEEDINGS OF THE ACADEMY OF [1899. 



The type (No. 70,024) was found by Prof. A. Heilprin and 

 party at Bermuda in 1888, and identified as T. j^ulchella d'Orbigny, 

 from which species it difiers decidedly in its nucleus, more slender 

 form, and oblique and curved ribs. 



Several specimens and fragments were also found at Bermuda, in 

 10-40 feet, by Prof. A. E. Verrill and party, in 1898. In these, 

 which are regularly developed, there are 18 ribs; but one example, 

 the same size as the type, has the ribs inconstantly developed, there 

 being 18 on the penultimate whorl and about 30 much fainter 

 ones on the body- whorl. This irregularity seems due to a slight 

 injury at the suture. There are also distinct lines of growth on 

 the base and the angles of the aperture are rounded. 



A single dead specimen (No. 79,011), without locality, in the 

 R. Swift collection, has a similar prominent, projecting, transverse 

 nucleus, convex whorls and form of aperture, but the 8 whorls 

 increase very gradually, more so than in T. Swiftii, the base is but 

 little rounded with a single brown spiral line. There are 16 trans- 

 verse ribs. 



Length, 3 mm. ; diameter, about f mm. 



"With a sufficient series, this may prove to be the young of a 

 distinct species as the proportions are so unlike other examples of 

 this species. 



This beautiful shell is named in honor of Miss Annie Peniston, of 

 Bermuda, who, through her keen interest in collecting specimens, 

 has aided so much in increasing the knowledge of Bermuda shells. 

 Turbonilla Swiftii, new species. 



Shell much elongated, very slender, gradually tapered, semi- 

 transparent, lustrous. Whorls slightly convex, 13 in the most per- 

 fect specimen (16 or 17 in the largest, which is broken away at the 

 top) below the prominent nucleus which is oblique, of 2|- projecting 

 whorls. Suture very distinct, deep, linear, giving a noticealile 

 clean-cut effect. Transverse ribs, varying from 20-26, rounded, 

 narrow, oblique, more or less curved, separated by much wider, deep 

 spaces, Avhich terminate on the periphery of the body-whorl with 

 more or less square-cut ends. Base rounded, smooth. Outer-lip 

 broken in all the specimens, inner-lip thin, reflected; aperture 

 somewhat elongate, expanded below, with rounded angles. In 

 some specimens there is a spiral, tooth-like ridge on the pillar-lip. 

 Fine, microscopic strise appear only on the base. 



