. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ARIONTA. 363 ing duct (13c) branches out, but instead of ending in a globular organ, it be- comes much enlarged in size, and ends in enveloping the prepuce (p p). The dart sac contained a small dart of the form figured by Leidy (Terr. Moll. U. S., I.) for Tebennophorus Caroliniensis. The oviduct was closely and spirally wound around the duct of the genital bladder. The testicle and ovary are yellow. The jaw is thick, arched, ends blunt, but little attenuated ; anterior surface with 6 stout, separated ribs denticulatin
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ARIONTA. 363 ing duct (13c) branches out, but instead of ending in a globular organ, it be- comes much enlarged in size, and ends in enveloping the prepuce (p p). The dart sac contained a small dart of the form figured by Leidy (Terr. Moll. U. S., I.) for Tebennophorus Caroliniensis. The oviduct was closely and spirally wound around the duct of the genital bladder. The testicle and ovary are yellow. The jaw is thick, arched, ends blunt, but little attenuated ; anterior surface with 6 stout, separated ribs denticulating either margin, and several less devel- oped, interstitial ribs. The lingual membrane is long and narrow with about 50—1—50 teeth. The centrals are of the form usual to the genus. The cusp with its cutting point is very short, reaching only about half-way to the lower edge of the base of at- tachment. Laterals of same type ; the second has a side cutting point. Mar- ginals low, wide, very variable in the denticles, but usually with one long, broad, sharply bifid inner denticle (the inner point much the smaller), and one short, sharp, rarely bifid outer denticle. There are 24 laterals. The twenty- second tooth has the side cutting point; on another membrane, the twentieth (PI. IX. Fig. L). Arionta exarata, Pfeiffkr. Shell umbilicated, depressed-conic, rather solid, malleated and wrinkled, yel- lowish, with one chestnut band; spire rather acute, conic: whorls 7, equally convex, gradually increasing, the last broader, rounded, scarcely falling in front, narrowed around the open, moderate umbilicus; aperture oblique, broadly lunate; peristome with a light white thickening, the terminations scarcely converging, the right slightly expanded, the columellar triangularly dilated above and widening. Greater diameter 30, lesser 25 mill.; height, 16 mill. Helix, exarata, Pfeiffer, Proc. Zool. Soc., 1857, 108 ; Mon. Hel. Viv., IV. 268. — W. G. Binney, TeiT. Moll., IV. 12 ; L. & F
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