390 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Plate LI. a, represent a variety of B. dealbatus (q. v.), as does also, I should 

 judge, Fig. 2 of Plate LI., 1 though the last may be B. Scldedeanus. 



In Vol. IV. of Terrestrial Mollusks I took the same view of Bui. alternatus 

 as at present, having the original figure of Mr. Say to assist in determining the 

 species (PI. LXXX. Fig. 3). I figured (PI. LXXX. Fig. 1) a specimen on 

 which a dark brown color is but slightly broken by white upon the upper 

 whorls. Fig. 15 of the same plate should be also referred to B. alternates. On 

 account of the lesser development of the columellar fold I erroneously referred 

 it to B. Schiedeanus. On p. 128 I repeated Pfeiffer's description of Bulimus 

 Maries. I had seen no specimen, and admitted the species only temporarily, 

 observing that it must be nearly allied, if not identical, with B. alternatus. 

 Since that time I have received authentic specimens, and have learnt that Bui. 

 Marice was described from specimens similar to those I have considered as Bui, 

 alternatus. While preparing the fourth volume of the Terrestrial Mollusks for 

 publication, I sent to Dr. Pfeiffer for identification specimens like those figured 

 on Plate LI. b. He returned them with the name B. Binneyanus. This will 

 account for the use of that name on p. 1 28. I have subsequently learnt that, 

 deciding the specimens sent to be a variety of B. Marice, he applied the name 

 B. Binneyanus to quite another species (Proc. Zob'l. Soc., 1858, PI. XLII. 

 Fig. 4). " 



Pfeiffer gives Say's description of B. alternatus as a species unknown to him. 

 It is not mentioned by other authors. 



Bulimus Maria;, Albers, is referred to alternatus from the description, given 

 below, of Albers and Pfeiffer, 2 from the figure in the second edition of Chem- 

 nitz, and from authentic specimens in my collection. 



Bulimus Maria. Shell perforate, ovate-pyramidal, striatu- 

 late, shining, white, varied irregularly with diaphanous bands 

 and spaced blotches ; whorls 6|, convex, joined by a deep 

 suture, the last a little shorter than the spire ; columella some- 

 what constricted, strongly tuberculate above ; aperture oblong- 

 oval, smoky within ; peristome whitely labiate within, broadly 

 expanded, its columellar margin reflexed, patent. Length 30, 

 diameter 12 mill.; of aperture, length 12, interior breadth 7 

 mill. (Albers.) 



Fif. 273 represents a common form of Bulimus Marice. 3 

 B. Maria. ^ p feiffer s description of B. Maria: is as follows : 



Shell narrowly umbilicated, oblong-conic, solid, rather smooth, white, often 



1 In the explanation of the plates in Vol. III. Dr. Gould refers Plate LI. b, to Bu 

 Schiedeanus, PI. LI. a, to lactarius, and Fig. 2 of LI. to alternatus. 



2 Plate LI. b, of Terr. Moll, is referred by Pfeiifer to a form of B. Marice, PI. LI. a, to 

 lactarius which he says may be alternatus, and PI. LI. Fig. 2, to Schiedeanus. 



s The figure being in outline is unshaded in the aperture, which in the original is dark 

 brown. 



