MOLLUSCA. 809 



1861. Solidula bullata Gabb, Synop. Moll. Cret. Form., p. 137 



(81). 

 1864. Soliduia (?) hidlatcD Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 17. 

 1868. Solidula bullata Con., Cook's Geol. N. J., p. 728. 

 1892. Avellana hidlata Whiti, Pal. N. J., vol. 2 (Monog-. U. 



S. G. S., vol. 18), p. 163, pi. 20, figs. 1-4. 

 1905. Avellana huilata Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 19. 



Description. — "Shell large for the genus, attaining fully an 

 inch in length; very globose, the diameter being nearly as great 

 as'the height, at least equaling seven-eighths of the height. Spire 

 low and rounded, and the base only slightly more pointed. Volu- 

 tions between three and four in number, the outer half of the 

 last one more abruptly deflected downward at the suture than 

 the preceding ones, but again elevated near the aperture. 

 Aperture narrow, pointed above and widest below and rounded ; 

 the length equal to about four-fifths of the entire length of the 

 shell; columellar margin thickened and marked by horizontal 

 ridges on the upper two-thirds of its length, and by two very 

 strong, ridge-like teeth or plications below the middle, the upper 

 of which is the stronger. Base and outer lip slightly thickened. 

 Surface of the shell, as shown on the cast, marked by fine spiral 

 lines, and by transverse lines of growth. Of the spiral lines 

 about 30 may be counted on the outer half of the body whorl 

 of the larger individual, those near the base being coarser than 

 those above, but gradually becoming fainter in strength. On 

 one of Dr. Morton's types the transverse lines are regular and 

 but little less strongly marked than the spiral lines, so that the 

 surface under a glass looks to be cut up into small nearly equal 

 solid nodes." (Whitfield.) 



Remarks. — In the recent collections of the Survey this 

 species has only been observed from the Merchantville clay, 

 althoup-h it seems to have been described from Navesink marl 

 examples. The species differs from Cinulia naticoides, which 

 has only been collected recently from the Navesink, in its larger 



