144 . A MANUAL OF AMERICAN LAND SHELLS, 



See remarks under the following species. 



The specimen figured was received from Dr. Xewcomb. It may not 

 be entirely mature. 

 The epiphragm is thick, white, parchment-like. 

 Jaw as usual in the genus ; 8 ribs. 



Lingual membrane (Terr. Moll., Y, Tlate IX, Fig. M) has 3G-l-3() teeth ; 

 the thirteenth tooth has the side cutting point; IG laterals. 



The genital system resembles very nearly that of NicJdiniana. The 

 duct of the genital bladder in this species is, however, very much 

 longer, its accessory duct shorter in proportion, the flagellum of the 

 penis sac longer. There is also a peculiar feature in the genitalia of 

 TrasM — a globular organ (probably a dart sac) of about equal diameter 

 with the vaginal prostate, attached laterally to the flagellum of the 

 latter, before it becomes bifurcated. It is figured in Terr. Moll., V, Plate 

 XIII, Fig. H. The bulbous expansions on the two branches of the 

 flagellumare also much larger in TrasTii. 



Ariontii Carpeiiteri, Nkwcomb. 

 Shell umbilicated, roundly conical, apex obtuse, obscurely marked 

 Fig. 123. with one brown band, well striated,- under the lens num- 

 erous very minute spiral striations; whorls 5i, rounded; 

 suture well marked; aperture circular, with termina- 

 tions approximating; peristome moderately expanded, 

 at the columella broadly so, but not adherent. Greater 

 diameter, 23"""; height, 16i"'"'. (Xewcomb.) 



Helix (.'((vpetiteri, Newcomu, Proc. Gal. Acad. Nat. Sci. (March, 1861), 



ii, UU 

 AgJaja Carpeiiieri, Tryon, Ain. Jonrii. Conch., ii, :513 (186G). 

 Helix liemomli, Tkyon, Proc. Acad. Nat. Sci. Philad., 1863, 281, pi. 



1,1. ! 7 7 l 



11, fig. 1. 



Arionta Eemondi, Tryon, Am. Journ. Couch., ii, 318, pi. v, fig. 18 (1866). 

 Jrioiifa Ccirpenfen, W. G. BixxEY, Terr. Moll., v, 366. 



Cinaloa; Trinidad; Coronado Island, Lower California; San Diego. 

 Originally in Tulare Valley, in the California Region. The last locality 

 is given by Dr. Xewcomb. 



The shell figured was received from Dr. Xewcomb. 



Jaw as usual ; over 7 ribs. 



Lingual membrane long and narrow. Teeth 48-1-48, with 20 lat- 

 erals. (See Terr. Moll., V, Plate IX, Fig. U.) It will be seen that 

 the central and first lateral teeth have no side cusps or cutting points; 

 they appear first on the eighth tooth. The change frox liitcrals to 

 marginals is formed as usual, the inner cutting point of the twonty-lirst 

 tooth being bifid. A marginal is shown in the thirty-fourth tooth. 



