PACIFIC COAST SPECIES. 85 



Lingual membrane (Plate I, Fig. D of Terr. Moll., Y. 93): see ante, 

 p. 80, for description of central tooth. 



Genitalia not observed, but the species is viviparous. 



Specimens from San Diego are characterized by very coarse strise of 

 growth, not delicate as described above, and with hardly perceptible 

 revolving strioe. From the shell alone I do not believe it possible to dis- 

 tinguish sportella from Toyona. Were it not for the difference in the 

 central tooth of the lingual membrane of the two specimens examined 

 by me, 1 should unite the two. A var. simplicilabris is mentioned by 

 Ancey (Le Nat. IV, 110). 



Macrocyclis Heiiipliilli, W. G. B. 



Shell allied to 31. Vancouver ensis, but the umbilicus is narrower and 

 not so much excavated, the termination of the last whorl not fig. 48. 

 receding from the umbilicus, as in all forms of Vancouveren- 

 sis and concava ; in all, the whorls are more or less strongly 

 striated within the umbilicus, often almost ribbed in concava; 

 not so in this shell ; the texture of the shell is glassy like Ry 

 alina, and there is no trace of microscopic revolving spiral lines 

 found in all the other forms ; beneath, the last whorl is propor- ^•^ff/'^^ 

 tionally wider. Greater diameter 14, lesser 10"""; height 5™™. 

 Macrocyclis HemphilJi, W. G. Binn, An. N. Y., Ac. Sc. i, 356, pi. xv, p. 17. 



Olympia, Washington Territory, a species of the Oregonian Eegion. 



Jaw and lingual dentition as usual in the genus ; characters of cen- 

 tral teeth not clearly seen. 



This species is named in honor of Mr. Henry Hemphill, to whom I 

 am indebted for collections from Alaska to Cape San Lucas and in the 

 Eocky Mountains. 



Macrocyclis I>uraiiti, Newcomb. 



Shell widely umbilicated, depressed, discoidal, of a dead white or 

 greenish color, thin, with very coarse, rough strife; whorls 

 4, flattened, the last discoidal, not descending at the aper- 

 ture, below broadly excavated and channeled; sutnre deli- 

 cate; aperture removed from the axis, transversely rounded; 

 peristome simple, acute, its terminations approaching, joined 

 by callus, that of the columella not reflected. Greater diam- 

 eter, 4™°^; height, l^-""^'. 



Helix Duranti, Newcomc, Proc. Cal. Acad. Nat. Sci., iii, 118 (1864).— Pfeiffer, Mon., 



V. 171 (1868). 

 Fatula Duranti, Tryon, Am. Journ. Conch., ii, 263, pi. iv, lig. 53 (1866). 



