54 BuivivETiN II 54 



centre is flattened, sometimes concave. Aperture oblong-ovate : 

 outer lip sinuous, with a clistindl, rounded semicircular slit on the 

 upper third below the shoulder, smooth internally ; inner lip 

 smooth, refledled, thickened above and below. 



''Locality. — Hatchetigbee bluff. In two different horizons 

 there. 



"This peculiar form has such a distincft slit in the outer lip 

 * * * , that it may deserve a sub-generic place, though it 

 resembles the living Cominella maculata Marty n, from New- 

 Zealand. In one specimen the shoulder of the body whorl rises 

 so as to almost hide the succeeding whorl, giving the shell a 

 triangular form. 



The generic affinities of this species are not well known. It 

 seems to us that it should be the type of a new subgenus if not 

 of a genus placed near Trhimphis. T. distorta Linne, has 

 very much the general appearance of this species but lacks all 

 traces of the Pleurotomoid labral sinus as well as the broad 

 tooth-like projecftion near the base of the labrum. 



Type. — Aldrich's colletlion. 



Tritonidea johnsoni, PL 7, fig. 4. 



Syn. Pisania (^Tritonidea) johnsoni ^'^.^ Bull. Am. Pal., vol. i, p. 65, 

 pi. 5, fig. 9. 



For Aldrich's original description, loc. cit. 



The tpye, in Aldrich's colledtion, from Bell's landing is 

 herewith redrawn. We have found no additional specimens of 

 this species. 



Mazzalina var. plenus, PI. 7, fig- 5- 



Syn. B ulbif HSU s plenus Aid., Bull, i, Geol. Surv. Ala.. 1886, p. 23, pl. 

 6, fig. 7. 

 For M. inaurata see our following bulletins on the Eocene of 

 Alabama. 



Aldrich's original description. — "Shell broadly fusiform ; 

 whorls probably six, surface on upper whorls with a few distindl 

 revolving lines, which on the upper part of the body become 

 faint ; body whorl swollen above, rapidly narrowing below, 

 where it is spirally striated with alternate raised lines ; whorls 



