294 NEW YORK STATE MUSEUM 



Genus holopea Hall 

 Holopea microclathrata sp. nov. 



Plate 4, figures 3, 4 



Description. Shell small, turbinate, apical angle about 73°, length 

 of type specimen in which apex and last fourth of body whorl are 

 lost, measured from broken part of apex to most distant point on 

 body whorl 8mm. Whorls about four, becoming gradually more 

 oblique, longest diameter of body whorl near the aperture making 

 an angle of about 50° with the vertical axis. Base of penultimate 

 whorl slightly flattened and making an angle of about 90° with 

 upper surface; angle well rounded and upper surface moderately 

 convex; outline of whorl rapidly becoming more rounded as aper- 

 ture is approached. Columella apparently strong and thickened and 

 there seems to be a small umbilicus ; no trace of lip across wall of 

 aperture. Eight fine revolving, raised striae between suture and 

 periphery.; on the penultimate whorl the first, second, fourth, sixth 

 and eighth are the more prominent of these. The spaces before the J 

 first and between this and the second are a little wider than the 

 others and are gently concave; the third stria (the first of the 

 fainter or secondary striae) lies at the center of a wider and shallow ;: 

 concave belt limited by the second and fourth striae; after the | 

 second the distance between striae is quite uniform and the secondary 

 striae are nearly as prominent as the primary and are but slightly 

 or not at all depressed below them. There is a peripheral stria and ' 

 eight or more similar striae on base of penultimate and body whorls. 

 The shallow spaces between the striae are crossed by very fine and 

 sharp, raised, transverse striae, as close as 17 or more to the milli- 

 meter. These striae pass slightly backward from the suture, curve 

 regularly and gently across the whorl and become directed forward 

 on the base. Viewed from the middle of the whorl the lines appear 

 to make no deviation whatever in any part of their course from the 

 vertical plane of their origin. The suture forms a fine, rather im- 

 pressed line just below the eighth stria, the whorls meeting at an 

 angle of about 90°. 



