132 TRANSACTIONS OF THE WAGNER FREE 



Height, from apex to basal margin, 5.3 inches; length (width), 3.7 

 inches. 



This very interesting cockle, which I have the pleasure of naming after 

 Mr. W. H. Dall, the distinguished malacologist of the U. S. National 

 Museum, is closely related to the recent Cardium snbclongatiuii from the 

 West Indian seas, of which it is not unlikely the progenitor. In the lat- 

 ter the ribs are much narrower, scarcely exceeding in width the inter- 

 spaces, and proportionately much more elevated. The echination on the 

 posterior slope in the recent form appears also to be more strongly de- 

 veloped. As far as the color traces remain in the fossil species it would 

 seem that the general scheme of coloring was the same in both species. 



An interesting relationship is also maintained between Cardium Dalli 

 and the Eastern C. elongation, from the Philippines, which in size and 

 general habit perhaps even more nearly corresponds to the Florida 

 fossil than does C. subclongatnm ; it is, however, a much more vcntricose 

 shell. 



Cerithidea scalata, nov. sp. Fig. 71. 



Shell broadly turreted, scalariform ; whorls ten or more, strongly 

 ribbed, those beyond the sixth or seventh whorl from the apex with a 

 more or less hollowed or excavated shoulder ; ribs oblique, defined only 

 on the lower half of the later whorls, twenty or more on the body-whorl, 

 with one or two variceal interruptions; revolving lines distinct on the 

 apical portion of the spire, cancellating that part of the shell ; aperture? 

 (broken) ; canal short, moderately deflexed. 



Length (of imperfect specimen), 2.4 inches. 



Vasum hoiridum, nov. sp. Fig. 72. 



Having received a number of perfect specimens of this beautiful species, 

 I am now able to supplement and complete the description given on page 

 75 of this report (Fig. 6). 



Shell turbinate, thick, with the greatest width at about one-third the 

 distance from the apex to the base ; spire moderately elevated, of about 

 6 to 7 whorls, most of which are doubly coronated or calcitrapated by 

 prominent lamellar or flattened spurs ; the spurs regularly increasing in 

 size, with the apices turned slightly backward. 



Body-whorl strongly angulated on the shoulder, beautifully coronated, 

 and crossed by about eight prominent revolving ridges, the four immedi- 

 ately following the shoulder coronation nearly equal, scaly, the sixth and 

 seventh, more particularly, carrying long lamellar spines or tubercles, 

 those of the sixth row indexed upward. 



Columellar plaits three, the uppermost by far the most prominent; 

 aperture about two-thirds the length of shell, flexuous inferiorly; umbilicus 

 long and broad. 



