204 BULLETIN OF THE 



Exchange, I. 5, p. 20, Nov., 1886). As a substitute for this preoccupied name, 

 Mr. Pilsbry suggests Anceyia. (See same, I. 6, p. 26, Dec., 1886.) Mr. 

 Ancey's description is: 



Pristina, Anc. (nov. subg. Hyalinse). Testa parvula, imperforata, cornea, nitens, 

 multispirata ; spira depresse conica. Apertura interdum lamellis radiantibus sub- 

 serratis in palato sitis insignis. 



Geographical Distribution : Western and Arctic North America. 



Types : Hyalina Stearnsi, Bland, and Lansmgi, Bland. 



Mr. W. G. Binney put these species, but with doubt, in Microphysa, while other 

 authors consider them as Hyalina} ; they differ from the latter by anatomic fea- 

 tures, and from the former by the form of the shell. Altogether I am inclined to 

 place the group in Hyalina, as a series nearly allied to Conulopdita, Boettger 

 (type, C. Raddei, Boettg.) ; I am confident the presence or absence of internal 

 lamina? or tooth-like processes within the aperture of Helices are not generic char- 

 acters ; in some instances they are either present or absent in closely allied species. 

 I established this fact when at work (Le Naturaliste, 1882) on the New Caledonian 

 forms, and I now repeat this as my opinion in regard to Pristina and Gastrodonta. 

 In the latter the teeth are frequently absorbed by the animal when growing larger. 



Macrocyclis Duranti, NEWC. 



To the synonymy add : - 



Selenites ccdatura, MAZYCK, Proc. U. S. Nat. Mus., 1886, p. 460, with figures of that 

 form and of typical Duranti. Also, Proc. Elliott Soc., Feb., 1886, p. 114, same 

 figures. 



Mr. Mazyck's description and figures are repeated here : 



Shell small, depressed, brownish horn-color, with very coarse, rough, crowded, 

 sub-equidistant, irregular ribs, which are obsolete at the apex; 

 whorls four, rounded, somewhat inflated below, gradually in- 

 creasing, the last not descending at the aperture ; suture im- 

 pressed ; umbilicus wide, clearly exhibiting all of the volutions ; 

 aperture almost circular, slightly oblique ; peristome simple, its 

 ends approaching and joined by a very thin, transparent, whitish 

 callus, through which the ribs are distinctly seen. Greater 

 diameter, 4 mm. ; height, If mm. 



Santa Barbara, California, Dr. L. G. Yates. Hayward's, Ala- 

 meda County, California, W. H. Dall, U. S. National Museum. 

 Macrocyclis Duranti, Newcomb's description of this little shell (M. Duranti) is as 

 var coelata, follows: 



"Shell depressed, discoidal, pale corneous, under the lens 

 minutely striated, opaque, broadly and perspectively umbilicated ; whorls 4, the last 

 shelving but not descending (at the aperture); suture linear; aperture rounded, 

 lunate, lip simple, the external and internal approaching. 



"Habitat. Santa Barbara Island." 



Mr. Binney's description, which is repeated in each of his works above named, 

 differs in this important particular. For Newcomb's "Under the lens minutely 

 striated," he substitutes the contradictory words " with very coarse, rough striae." 



