164 PROCEEDINGS OF THE ACADEMY OF [1899. 



what flattened whorls below the nucleus, which is injured. There 

 are about 20 transverse ribs on the body -whorl, thin, narrower 

 than their interspaces which, under the microscope, are crossed by 

 about 7 fine lines below and from 4 to 7 above the central groove. 

 The lines show more clearly in some positions than in others. 



Length, 8 mm. ; diameter, If mm. ; length of aperture. If mm. 



Turbonilla substriata C. B. Adams. 



Chemnitzia substriata C. B. Ad., Cout. to Conch., No. 5, p. 73, 1850 ; O. 

 A. L. Morch, Syn. Moll. Mar. Ind. occi., p. 162, 1875. 



Turbonilla substriata Tryon, Manual, viii, p. 330. pi. 76, fig. 21 (very 

 poor), 1885. 



' ' Shell moderately elongated white, with a slight tinge of wax 

 color next above the suture, with about 22-24 transverse, rather 

 stout ribs; in the intercostal spaces and anteriorly with very numer- 

 ous crowded excessively minute spiral striae, which are scarcely 

 perceptible under a common magnifier; on the middle of the whorls 

 is a series of spiral shallow pits in the intercostal spaces; on the last 

 whorl, with the anterior extremity of the intercostal spaces moder- 

 ately depressed, below the surface of the anterior region ; spire with 

 rectilinear outlines; whorls about eight, planulate, with a distinct 

 suture; aperture rhombic-ovate; labium scarcely thickened; um- 

 bilical region scarcely indented. Length, .115 inch; breadth, .04 

 inch." 



Two specimens (No. 72,046) without locality, were labelled as 

 this species. They are white, semitransparent and lustrous. The 

 nucleus is prominent, slightly obhque, somewhat flattened. The 

 body-whorl subangulated at the periphery with a short, but little 

 rounded base which, with the wide intercostal spaces are cut by 

 numerous, very fine, shallow, incised, spiral lines, interrupted on 

 the middle of the whorls by a much wider, inconspicuous, shallow 

 line or groove, seen only in a good light, and under the microscope ; 

 above and below this, the spirals number about 30. The ends of 

 the spaces are very deep, but the fine spirals cover the entire sur- 

 face. 



Length of the larger specimens, 3i mm. ; diameter, li mm. ; 

 length of aperture, 1 mm. 



This species is closely related to T. puncta C. B. Adams, but the 

 whorls are shorter, the ribs narrow, perpendicular, with wide inter- 

 spaces, and the spirals are not so deeply cut. 



