398 A MANUAL OF AMERICAN LAND SHELT S. 



central figures of Plate LI, «., represent a variety of B. clealhains (q. v.), 

 as does also, I should judge, Fig. 2 of Plate LI,* though the last may 

 be B. Schiedeamis. 



lu Vol. IV of Terrestrial Mollusks I took the same view of J5. cdter- 

 7iatus as at present, having the oiiginal figure of Mr. Say to assist in 

 determining the species (Plate LXXX, Fig. 3). I figured (Plate LXXX, 

 Fig. 1) a siiecimen on which a dark brown color is but slightly broken 

 by white upon the u]>per whorls. Fig. 15 of the same plate should bo 

 also referred to B. aJternatm. On account of the lesser development 

 of the columellar fold I erroneously referred it to B. Schiedeanii.^. On p. 

 128 I repeated Pfeitfer's description of Bulimus Markc. I had seen no 

 specimen,' and admitted tlie species only temporarily, observing that 

 it must be nearly allied, if not identical, with B. altervatus. Since that 

 time I have received authentic specimens, and have learned that B, 

 Maria' was described from siiecimens similar to those I have considered 

 as B. aUernaius. While preparing the fourth volume of the Terrestrial 

 Mollusks for publication, I sent to Dr. Pfeififer for identification speci- 

 mens like those figured on Plate LI, h. He returned them with the 

 nanre B. Bintieyanus. This "will account for the use of that name on p. 

 128. I have subsequently learned that, deciding the specimens sent to 

 to be a variety of B. Maria\ he applied the luime B. Binneyanus to quite 

 another species (Proc. Zool. Soc, 1858, Plate XLII, Fig. 4). 



Pfeiffer gives Say's description of I?. aJternatns as a species unknown 



to him. It is not mentioned by other authors. 



BuUnins Marw^ Albers, is referred to alternalus from the description, 



Fig. 434. givcu bclow, of Albcrs and Pfeiffer,t from the figure in the 



second edition of ChemnitZj and from authentic specimens 



in my collection. 



Bnlimus Maria\ — Shell perforate, ovate-pyramidal, stri- 



atuhite, shining, white, varied irregularly with diaphanous 



bands'and spaced blotches; whorls GJ, convex, joined by a 



deep suture, the last a little shorter than the si)ire; cohi- 



B. Marice. mclla somcwluit constricted, strongly tuberculate above; 



ai)erture oblong-oval, smoky within; peristome whitely labiate within, 



broadly expanded, its columellar margin reflexed, patent. Length, 



* In the explanation of the plates in Vol. Ill Dr. Gould refers Plate LI, 1), to Bui, 

 Schicdcanus, Plate LI, «, to htciuriuf:, and Fig. 2 of LI to aUeriiaiucs. 



t I'lafi' LI, b, of Terr, Moll., is referred by Pfeiffer to a form of B. Maricv, Plate LI, 

 a, \o luvtariun, which he says may be alternalus, and Plate LI, Fig. 2, to Scliiideanus. 



