352 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



and still lower down. There is a well-marked prepuce. Opposite the en- 

 trance of the penis, on the other side of the vagina, which is here considerably 

 swollen, is a sac-like organ (PI. XV. Fig. E, pr. g), ending in a smoothly 

 rounded dart sac (d s), with a short dart within it. Just below this dart sac 

 opens the duct of another very variable organ (a g), cylindrical, hollow, of a 

 reticulated appearance, irregular in size and bearing a globular apex; it is 

 much longer than the penis with its flagellum, and stouter, as in Fig. E, or 

 much less developed, and without the bulb as in F. No dart was noticed within 

 this organ. It is, no doubt, a form of vaginal prostate, as described by 

 Moquin-Tandon. The genital bladder is globular. Its duct is long, free in 

 the upper half of its course. The oviduct, ovary, genital bladder, testicle, etc., 

 of infumata (Fig. F) are not figured by me. They are as in fidelis (Fig. E). 

 This comparison of the genitalia strengthens the belief of the identity of the 



two forms. 



Aglaia infumata, Gould. 



Shell umbilicated, large, discoidal, biconvex, obtusely carinated at the pe- 

 riphery, widely umbilicated, smoky above, 

 roughened with minute, oblique, rasp-like 

 irregularities which bear very short, soft 

 hairs in the fresh state, below very black, 

 shining and minutely granulated ; whorls 

 6^, convex ; aperture rhomboidal ; peristome 

 reddish, somewhat reflected at base ; throat 

 silky-lilac, near the peristome smoky. Di- 

 A. infumata. ame tev, 37 mill. ; height, 20 mill. 



Helix infumata, Gould, Proc. Bost. Soc, V. 127 (1855) ; Terr. Moll., III. 13. — 

 W. G. Binney, Pac. R. R. Rep., VI. 112 (1857); Terr. Moll., IV. 15, PI. 

 LXXIX. Fig. 2 ; L. & Fr.-W. Sh., I. 161 (1869). — Pfeiffek, Mon. Hel. Viv., 

 IV. 351. 

 Aglaja infumata, Tryon, Am. Journ. Conch., II. 310 (1867). 



Californian Region from Humboldt's Bay to San Pablo Bay, especially in 

 Marin, Alameda, Mendocino Counties. 



The species has a thick, white, membranous epiphragm. I have already 

 (p. 351) expressed my belief of its being identical with fidelis. 



Jaw very arcuate, of uniform width throughout; ends square; anterior sur- 

 face with 5-9 crowded, stout ribs, denticulating either margin. 



Lingual membrane (PI. IX. Fig. B) has 45—1—45 teeth, with 16 laterals, 

 the seventeenth tooth having its inner cutting point bifid. There are no side 

 cusps or cutting points on centrals and first laterals. 



Genitalia (see above). 



Aglaia Hillebrandi, Newcomb. 

 Shell umbilicated, biconvex, orbicularly depressed, carinated; yellowish 

 horn-color, with a chestnut band within two white ones, showing only in the 



