73 



CLASS PTEROPODA. 

 Family CONULARIID^. 



conularia blairi, d. sp. 



Plate Vir, Fig. 14, part of the surface of the upper part of the 



shel]; Fig: 1-1, a specimen showing a portion ot the 



inside of a shell, the elevated ridge shows 



the depression of the angles. 



Shell very large, pyramidal. Angles at the four corners 

 deeply furrowed. Lateral surfaces marked with a longitudinal, 

 mesial line, without any furrow. Surface ornamented with 

 transverse, smooth furrows, that are separated by low, sharp, 

 creuate, transverse costte; in passing across the sides, these 

 curve forward toward the aperture, and sometimes the costiB 

 alternate at the mesial line, at other times they cross it with 

 slight interruption. There are from twenty-one to twenty-four 

 costcf, in a dista.nce equal to the width of a side. The costse 

 curve forward toward the aperture, in crossing the furrows, at 

 the four corners. There are about eight crenulations, on 

 the costse in one-eighth of an inch, and about sixteen fur- 

 rows in an inch, or about four crenulations in a distance equal 

 to the width of a furrow, toward the apex ; but nearer to the 

 aperture there are six crenulations in a distance equal to the 

 width of a furrow. 



One side of a specimen, three and one-fourth inches long, has 

 a diameter, at one end, of five-eights of an inch, and a diameter 

 at the other end of one and six-eighths inches. 



This is a large species and when compared with C. gratiosa, 

 it will be noticed that the sides are less convex, the angles at 

 the four corners deeper, and the furrows only half as wide, 



-10 G. 



