286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



FISSURIDEA BERMUDENSIS, new species. 

 Plate 35, fig. 8. 



Shell small, white, elevated, reticulately sculptured; apex a little 

 in advance of the middle of the shell, rather pointed; the anal aper- 

 ture long-oval, the margins excavated in the middle, internally with 

 a thickened margin, subtruncate behind; sculpture of radiating 

 threads with wider deep interspaces, crossed between the apex and 

 the base by about a dozen concentric lines, representing old margins, 

 nodulating the radials and forming deep pits between the intersec- 

 tions; interior of the shell white, the margin forming a regular oval, 

 and often internally radially grooved in harmony with the external 

 ribs. Length, 5; breadth, 3.5; height, 3 mm. 



Cotypes. — In the Bermuda Museum and U. S. National Museum 

 Cat. No. 221618. 



This small species has been carefully compared with young speci- 

 mens of the already known species with none of which could it, ap- 

 parently, be prudently united. 



ODOSTOMIA (CHRYSALLIDA) NIOBA, new species. 



Shell broadly conic, milk-white. Nuclear whorls small, obliquely 

 immersed in the first of the succeeding turns, above which only about 

 half of the last volution projects. This is marked with three strong 

 spiral threads which are almost as wide as the spaces that separate 

 them. Post-nuclear whorls moderately rounded, marked with strong, 

 slightly retractive ribs of which 16 occur upon the first, 18 upon the 

 second, 20 upon the third, and 22 upon the penultimate whorl. These 

 ribs are about as wide as the spaces that separate them. In addition 

 to the axial ribs, the whorls are marked with four spiral cords which 

 are much wider than the spaces that separate them. The intersec- 

 tions of the axial ribs and spiral cords form well rounded, low tuber- 

 cles. Sutures strongly channeled. Periphery of the last whorl and 

 base well rounded, marked with four equal and equally spaced spiral 

 cords. Aperture oval, posterior angle acute, outer lip thin, showing 

 the external sculpture within; inner lip oblique and reflected partly 

 over the base; parietal wall covered with a thin callus. 



The type and six specimens of this species were collected by Mr. A. 

 Haycock, at Bermuda. They form Cat. No. 223284, U.S.N.M. The 

 type has five post-nuclear whorls and measures: Length 2.6 mm., 

 diameter 1.3 mm. 



The specimens of this and the next species arrived after the plate 

 for this paper had been prepared. Hence, no figure of it is included 

 in this report. 



