14 Bulletin ii 14 



body whorl; ribs more or less angular centrall3^ giving the 

 whorl a carinated appearance, crossed by many faint revolving 

 lines above the carina, and by much coarser ones on the carina 

 and below; lines of growth nearly obliterated by the spirals; 

 mouth about one half the length of the whole shell. 



It is with great reludlance that we propose a new name for 

 this seemingly common type of Pleiu^otoma. Small specimens of 

 this genus with two rows of nodules, one sub-sutural, the other 

 carinal are common indeed in our Claiborne and other Eocene 

 deposits; great variation moreover is shown among different speci- 

 mens of this form; but it will be observed that the variation from 

 the type specimen figured is toward the moniliata style of 

 ornamentation; the great length of mouth in proportion to the 

 height of spire, the coarseness and central carination of the ribs, 

 the convex rather than concave sides of the spire, and other less 

 noticeable features are not at all in harmonj^ with the Claiborn- 

 ian rugosa Lea, rmpera Con., etc., etc. 



Localities. — Ala.: Woods bluff ;3 mi. S. W. of Thomasville. 



Type and specimen figiu^ed. — Woods bluff: Paleontological 

 Museum, Cornell Univ. 



Pleurotoma vaughani var. sylvaerupis, PI. 2, fig. 2. 



Syn. PI. vaughani Har., Proc. Ac. Nat. Sci. Phila., 1895, p. 57, pi. 4, 



fig. s! 



PI. vaugha7ii Har., Proc. Acad, etc., 1896, p. 475, pi. 20, fig. 9. 



Harris' original description of vaughani.- —'"^Az^ and general 

 form as indicated by the figure; whorls about 11; i, 2, 3 smooth 

 and very small, 4 nodular, 5 nodular and with a subsutural line 

 or band; 6, 7, 8, as 5 but also striate spirally; 9, 10 nodular 

 costate, costse showing a slight tendency to become oblique, 

 mainly confined to the lower moiety of the whorls, strongly 

 striate below, and with two noticeably large striae on the carina, 

 faintly striate above; body whorl with rather coarse spiral lines 

 alternating in size from the carinal region to the end of the beak, 

 supercarinal region faintl}^ striate, costae obscure; labrum striate 

 within." 



