358 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



microscopic granules arranged in quincunx ; pale horn-color or sometimes cine- 

 reous, girdled with a single narrow chestnut bronze zone, paler at its edges ; 

 the whole covered with a thin, yellowish-brown epidermis ; spire elevated, 

 whorls 6, moderately convex, the outer one ventricose, with some approach to 

 an angular periphery ; base tumid, depressed at centre, and perforated by a 

 very small umbilicus ; aperture rounded, forming two thirds of a circle, banded 

 within ; peristome white, slightly reflected above, more so below, until at the 

 umbilicus it is quite re volute, and mostly covers the opening. Greater diame- 

 ter 28, lesser 23 mill.; height, 19 mill. 



Helix Nkkliniana, Lea, Trans. Am. Phil. Soc, VI. 100, PI. XXIII. Fig. 84 ; 

 Obs., II. 100 (1839) ; Troschel, Arch. f. Nat., 1839, II. 221. — Binney (part), 

 Terr.Moll., II. 119, PI. VI. a. — W. G. Binney, Terr. Moll., IV. 7 ; L. & Fr.- 

 W. Sh., I. — Pfeiffer, Mon. Hel. Viv., IV. 269. 

 Helix Californiensis, Pfeiffer, Mon. Hel. Viv., I. 339 ; III. 229 ; in Chem- 

 nitz, ed. 2, 332, PI. LVII. Figs. 14, 15, excl. var. 2 (1846). —Reeve, Con. 

 Icon., No. 661. — Not of Lea. 

 Helix arborciorum, Valenciennes, Voy. de la Venus, Moll., PI. I. Fig. 3 (see 



Terr. Moll., IV. PL LXXVI. Fig. 13). 

 Helix ncmorivaga, Valenciennes, 1. c. Fig. 1 (see Terr. Moll., Vol. IV. PL 



LXXIX. Fig. 11). 

 Helix anachoreta, W. G. Binney, Proc. Acad. Nat. Sci. Philad., 1857, 185 ; 

 Terr. Moll., IV. 11, PL LXXVI. Fig. 5. —Pfeiffer, Mon. Hel. Viv., IV. 

 349. 

 Aglaja NicMiniana, Tryon, Am. Journ. Conch., II. 312 (1867). 

 Aglaja anachoreta, Tryon, Am. Journ. Conch., II. 311 (1867). 



California Region, from Santa Cruz to Mendocino County. (Cooper.) 



The animal has a uniform dark lead-color over the body, darker on head 

 and eye-peduncles; base of foot dirty white. Tail almost carinated, pointed. 



The epiphragm is as usual in the genus. 



Jaw as usual in the genus ; over 6 ribs. 



Lino-ual membrane (PL IX. Fig. F) as usual; teeth 44 — 1 — 44, with 16 

 laterals, the seventeenth tooth having its inner cutting point bifid. 



The genitalia are figured on PI. XIII. Fig. C. The ovary is yellow, long, 

 narrow, concave on one side, convex and carinated on the other. The acces- 

 sory gland of the epididymis is composed of long white caeca. The oviduct is 

 extremely long, narrow, convoluted. The genital bladder is globular, small, 

 with an extremely long duct, to which is added an accessory duct or branch, 

 almost as long as the oviduct. This branch joins .the duct near its end. It is 

 thicker than the duct. The duct enters the vagina at its upper part. The 

 penis sac is long, cylindrical, small, almost equalling in length the oviduct and 

 ovary united. The retractor muscle is inserted at about the middle of its 

 length, it is attached to the diaphragm ; the vas deferens enters about three 

 fourths of its length ; beyond the vas deferens is a flagellate extension. The 

 vagina is long and narrow ; near its base, opposite the entrance of the sac of 



