EASTERN PROVINCE NORTHERN REGION SPECIES. 



181 



Fig. 175. 



Morse uses the name Bimieyi, which can be employed, if necessary, to 

 distinguish the species from Pfeiifer's. 

 Genitalia not observed. 



Zoiiites ferreiis, Morse. 



Shell umbilicated, depressed-globose, transparent, of a very light 

 steel-gray color, not shining, marked with very delicate 

 incremental wrinkles and microscopic revolving lines; 

 spire slightlj" elevated ; whorls 3, rounded, the last rap- 

 idly enlarging, globose; aperture large, transversely 

 subcircular ; i^eristome simple, acute, its extremities not approaching, 

 that of the columella scarcely subreflected. Greatest diameter, 2^""" ; 

 height, l^'""^ 



Striatura ferrea, Morse, Proc. Portl. S. N. H., i, 17, figs. 3G-40, and pi. ii, fig. 10 (1864). 

 Bi/alinaferrea, Tryon, Anier.Journ. Conch., ij,25:i (1866).— W. G. Bixnev. L. & Fr.- 

 W. Sh., i, 40 (1869).— Gould and Binney, Invert, of Mass., ed.2, 401 (1870). 

 Helix ferrea, Morse, Amer. Nat., i, 544, fig. 37 (1867). 

 Zonites ferreus, W. G. BiNiney, Terr. Moll., v, 121. 



Z. ferreus. 



Fig. 176. 



J Sivr of Z. ferreus. (Mor.se.) 



Maine ; a species of the Northern Eegion. 



Jaw angularly arched, ends ta- 

 pering, acute ; anterior surface 

 deeply channeled in its center; 

 concave margin smooth, with a 

 deep median indentation, probably 

 worn by the greatly developed cen- 

 tral tooth of the lingual membrane. 



Lingual membrane with 39 curving rows of 20-1-20 teeth ; centrals 

 enormously developed, very broad, tricusi)id, the middle cusp very 

 broad; two bicuspid laterals on each side, the inner much the smaller; 

 marginals aculeate. Another membrane (Terr. Moll., V, Plate III, 

 Fig. P) had also 20-1-20 teeth, with 2 perfect laterals. In the great 

 development of the central t-oth this species resembles Z. milium. 



Genitalia unobserved. 



Zonites exig^uus, Stimpson, 



Shell broadly umbilicated, depressed, pellucid, greenish horn color, 

 marked with delicate revolving lines, and distant longitud- 

 inal ribs obliquely decussating the incremental striiie; spire 

 scarcely elevated, apex free from strife ; whorls 3i, convex, 



•^ ' ^ ' -J J Z,e.rigmis, 



the last rounded, widely umbilicated below ; aperture ob- enlarged. 

 lique, transversely rounded, remote from the axis ; peristome simple, 



