193 Midway Stage 79 



subsutural band; from the latter it differs in having more con- 

 stricted sutures, by having a tendency to costation in the upper 

 spiral whorls, not embryonic. 



Locality. — Alabama: Matthews' Landing. 



Type. — Paleontological Museum, Cornell Univ. 



Pleurotonia mediavia n. sp., PI. 7, fig. 16. 



Specific characterization. — General outline as shown by the 

 figure; two embryonic whorls small, smooth, a third and a part 

 of the fourth are longitudinally costate, finely so at first but 

 becoming coarser below; on the four sub-embryonic spiral whorls 

 there is a submedial carina traversed by fine costations not so 

 sharply biangular as in PI. denticula or PI. alternata, but recalling 

 those in PL waterkeynii as shown on pi. 30 of Edwards' Eocene 

 Mollusca of England, i860; spiral and longitudinal lines fine, 

 though just beneath the carina the spirals are apt to be coarser; 

 costations traversed by four fine spiral lines; costse nearly obsolete 

 on the body whorl. 



A very closely related but larger form from Wood's Bluff has 

 three lines traversing the costse, while PL alternata and PL 

 childrefii have but two. 



Locality. — Alabama: i mi. W. of Oak Hill P. O., Wilcox Co. 



Type. — Paleontological Museum, Cornell Univ. 



Pleurotoma {Cytharaf) leania n. sp., PI. 7, fig. 17. 



Specific characterization. — Size and general form as indicated 

 by the figure; three or four embryonic whorls, the lower two of 

 which are longitudinally costate; remaining two spiral whorls 

 costate and strongly striate spirally with lines of alternate 

 strength; body whorl with ribs dying out submedially, slightly 

 shouldered above, retral sinus very shallow; columella long, 

 slightly deflected. The shell has a decided Fusoid appearance. 



Locality. — Alabama: Matthews' I^anding, Alabama river. 



Type. — Lea Memorial collection, Ac. Nat. Sci. , Phila. 



Pleurotoma {Drillia) quercollis, PI. 7, fig. 18. 



Specific characterization. — Size and general form as indicated 

 by the figure; whorls about 10; i and 2 smooth, 3 and 4 longi- 

 tudinally costate; remaining spiral whorls marked by about 12 

 costse, and by two strong spiral raised lines or carinae on the 

 larger part of the whorl and one subsutural line; body whorl 

 marked like the spiral whorls, the costse dying out subcentrally; 



