306 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



I have in my cabinet a reversed individual, of var. a, found in my garden in 

 Burlington, New Jersey. It is a descendant of some Illinois specimens, sent 

 me many years ago by the lamented Kennicott. The adaptation 

 Fig. 199. f the species to colonization is also proved by its having re- 

 cently been found by Mr. J. Matthew Jones in the island of 

 Bermuda, no doubt imported on plants. 



The genitalia are figured on PL XI. Fif. K. The ovary is 

 Jaw of 



T. appressa. long and narrow. The epididymis is very long, convoluted at 

 the end nearer the oviduct. The last-named organ is not much 

 convoluted. The prostate is scalloped along its edges. The genital bladder 

 is globular, small, with a long, small duct. The sac of the penis is extremely 

 long, ribbon-like, one and one half times as long as the oviduct. The vas 

 deferens enters its apex. 



The long ribbon-like sac of the penis resembles that figured by Dr. Leidy 

 of Mesodon Sayii. There is but little resemblance to the genitalia of T. palli- 

 ata, so nearly allied by its shell. 



Triodopsia inflecta, SAY. 

 Vol. III. PL XLV. Figs. 2, 3. 



Shell with the umbilicus closed, depressed ; epidermis brownish horn-color, 

 with very fine, hair-like projections ; whorls 5, with very minute transverse 

 strise; suture not much impressed; aperture' three-lobed, very 

 much contracted ; peristome white, narrow, reflected, with a Fi - 200< 

 deep groove or indentation behind the reflection, contracting 

 the opening so that the outer edge of the peristome does not 

 project beyond the surface of the whorl ; on the inner margin 

 of the peristome are two acute teeth, with the points directed 

 inwards, one near the base, the other midway between that and 

 the junction of the peristome with the body-whorl, with a circular 

 sinus between them, forming one of the lobes of the aperture ; parietal wall 

 with a long, arcuated, white tooth ; umbilicus covered, its place considerably 

 impressed. Greater diameter 12, lesser 11 mill. ; height, 6 mill. 



Helix inflecta, SAY, Journ. Phila. Acad., II. 153 (1821) ; ed. BINNEY, 16. BIN- 

 KEY, Bost. Journ. Nat. Hist., III. 358, PI. IX. Fig. 1 (1840) ; Terr. Moll., II. 

 143, PI. XLV. Figs. 2, 3. DEKAY, N. Y. Moll., 45 (1843). MRS. GRAY, 

 Fig. Moll. An., PI. CXCIII. Fig. 7 (ex Bost. Journ., no descr.). W. G. BIN- 

 KEY, Terr. Moll., IV. 59 ; L. & Fr.-W. Sh., I. 128, Fig. 216 (1869). BLAND, 

 Ann. N. Y. Lye., VII. 425. PFEIFFER, Mon. Hel. Viv., IV. 319. 



Helix clausa, FERUSSAC, Tab. Syst., 38, No. 104; Hist., PI. LI. Fig. 2. DE- 

 SHAYES, Encycl. Meth., II. 252 (1830) ; in LAMARCK, VIII. 114 ; ed. 3, III. 

 309; in FER., I. 143. PFEIFFER, Mon. Hel. Viv., I. 420 ; in CHEMNITZ, 2d 

 ed., I. 368, t. LXIV. Figs. 25, 26. REEVE, Con. Icon., No. 704 (1852). 



