200 BULLETIN OF THE 



The foregoing description is copied from the Proceedings of the U. S. 

 National Museum, 1888, p. 449, while the figure is drawn from a specimen 

 kindly furnished by Mr. Simpson. 



The shell appears to me to be a toothless form of some Triodopsis, rather than 

 a Mesodon (see above, under Triodopsis Levettei). It also resembles nearly 

 some of the toothless forms of Triodopsis Mullani. 



Acanthinula granum, Strebel and Pfeiffer. 



Shell small, umbilicated, thin, scarcely shining, light horn-colored, with 

 rib-like striae of growth, crossed obliquely w T ith rib-like 

 folds, in fresh specimens hirsute or with punctate epi- 

 dermis. Whorls 4|, four of them broad, rounded, regu- 

 larly increasing in size, rapidly in elevation, the last 

 descending, impressed at the umbilicus. Peristome 

 simple, broadly reflected at its columellar margin, par- 



Acanthinuia granum, tially covering the deep umbilicus, within with whitish, 

 enlarged. ' 



light thickening. Greater diam. 2.8, lesser 2.6, height 



2.8 mm.; of aperture, height 1.2, breadth 1 mm. (Strebel and Pfeiffer.) 



Acanthinula granum, Strebel and Pfeiffer, Beitrag zur Kennt. der F. Mex. L. 

 und S. W. Conch., IV., 1880, p. 31, Plate IV. Fig. 13, not Plate IX., as quoted 

 in text. 



A Mexican species, found also in Florida; Archer, Alachua Co.; Evans 

 Plantation, Rogers River; Lake Worth (Dall). 



Mr. Dall says the shell, when perfect, is nearly the size of labyrinthica, very 

 thin, reddish brown, with very deep sutures and a rather deep, small tubular 

 umbilicus. It is covered with beautiful deep oblicpie epidermal ridges, which 

 are easily lost, and do not agree with the lines of growth. 



The figure is drawn from a specimen kindly furnished by G. W. Webster. 



Dorcasia Berlandieriana, Moricand. 

 griseola, Pfeiffer. 



Bulimulus patriarcha, W. G. B. 

 alternatus, Say. 



I am assured by Dr. Singerly and Mr. Simpson that the form known as 

 alternatus does not always have a dark aperture, and the intermingling of the 

 forms leads an observer on the spot to believe alternatus, Schiedcanus, Moore- 

 anus, and dcalbatus varieties of one and the same species. They were so treated 

 by my father in Vol. II. 



Bulimulus Schiedeanus, Pfeiffer, 

 var. Mooreanus, W. G. B. 

 dealbatus, Sat 



