NO. 2055. MARINE MOLLUSKS— HENDERSON AND BART8CII. 417 



incised lines. The space between the summit and the first incised 

 line is crossed by 3 very fine equal and equally spaced spiral striations. 

 The incised lines pass up on the sides of the ribs but do not cross 

 the summit. In addition to the above sculpture, the entire surface 

 of the shell is marked with microscopic lines of growth and spiral 

 striations. Suture strongly impressed. Peripheiy of the last whorl 

 well rounded. Base moderately long, well rounded, marked by the 

 continuations of the axial ribs, wliich disappear shortly after passing 

 the peripheiy, and 15 incised spiral lines of somewhat varying 

 width. There is a plain band between the fifth spiral line of the 

 spire and the first incised line of the base a little broader than the 

 band at the summit. Aperture ovate; posterior angle acute; outer 

 lip thin, showing the external sculpture within; inner lip thin, some- 

 what sigmoid, and slightly revolute; parietal wall covered with a 

 thin callus. 



The type, Cat. No. 252573, U.S.N.M., was dredged at Chincoteague, 

 Virginia. It has 8 post-nuclear whorls, having lost the nucleus and 

 probably the first post-nuclear turn, and measures: Length, 4.2 mm.; 

 diameter, 1.4 mm. 



Another specimen, in not quite as good condition as the type, 

 has 9 post-nuclear whorls, and measures: Length, 6.2 mm.; diameter, 

 1.7 mm. 



TURBONILLA (PYRGISCUS), species? 



A specimen apparently of an undescribed species, but too poor to 

 serve for description. 



TURBONILLA (PYRGISCUS), species? 



The above remarks apply also here. 



ODOSTOMIA (CHRYSALLIDA) TOYATANI, new species. 



Plate 13, fig. 2. 



Shell small, elongate-ovate, bluish white. Nuclear whorls obliquely 

 immersed in the fii'st of the succeeding turns, above which only half 

 of the last volution projects. Post-nuclear whorls feebly rounded, 

 shouldered at the summit, marked by somewhat retractive axial ribs, 

 which are about as broad as the spaces that separate them. Of these 

 ribs, 20 occur upon the first, 22 upon the second and third, and 24 

 upon the last turn. In addition to the axial ribs, the whorls are 

 crossed by 4 spiral cords which equal the axial ribs in strength and 

 render the junction of the axial ribs and the spiral cords nodulous. 

 The first of these cords is at the summit, and the fourth bounds the 

 peripheral sulcus. The spaces inclosed between the axial ribs and the 

 spiral cords are strongly impressed, rectangular pits, having the long 

 axis parallel with the spiral sculpture. Suture channeled. Periphery 

 of the last whorl marked by a strong sulcus. Base moderately long, 

 slightly umbilicated, marked by 9 sphal cords, which diminish regu- 

 34843°— Proc.N.M.vol.47— 14 27 



