466 A MANUAL OF AMERICAN LAND SHELLS. 



Limax agrestis* (Terr. Moll., V, Plate I, Fig:. H) has about 50-1-50 

 teeth on its linjjual membrane, with 18 perfect laterals. The centrals 

 have a much more graceful outline to the reflection than in the two 

 last-named species. The median cusp is longer and more slender, with a 

 more slender cutting point; the subobsolete side cusps are more marked 

 and bear well developed, triMngular, slightly curved cutting points. 

 The lateral teeth are like the centrals, but unsymmetrical by the sup- 

 pression of the inner lateral lower expansion of the base of attachment. 

 There is, however, an inner cutting point lying against the inner side 

 of the cusp, rather than in a position corresponding to the outer cut- 

 ting point; it is very difficult of detection, being on a different plane 

 from the outer cutting point, and readily confounded with the inner 

 lower angle of the base of attachment. It is figured by Lehmaun and 

 Heynemann. The marginals are long and slender, without bifurca- 

 tion even on those on the extreme edge of the membrane. Fig. 105 of 

 p. 63 of L. & Fr.-W. Sh. N. A., I, probably was drawn from a speci- 

 men of this species, certainly not from one of Jfavus. 



Goldfuss {I. c, Plate V, Fig. 4) omits the cutting points from his 

 figure. 



The genitalia, as well as complete anatomy, are figured by Leidy 

 (Terr. Moll., I, Plate II, Figs. 7-9). The genital bladder (7) is short, 

 narrowly elongate ovate, with blunt apex and short duct. The penis 

 sac (4) is peculiar; it is short and stout, narrowing towards its apex, 

 where it is extended into a short, trifurcate gland (3) ; the retractor 

 muscle (5) is attached on the side of the penis sac, below this gland. 



STENOGYKA. (Seep. 424.) 

 Stenojf yra decollata, Linn. 



Shell rather thick, long, cylindrical, turreted ; epidermis shining, 

 Pig. 499. whitish, with a sliiilit tint of brownish or yellowish; apex ob- 

 tuse; spire gradually enlarging from the apex to the aperture, 

 commonly abruptly truncated between the third and fifth 

 whorls next the aperture; whorls remaining 3 to 5, flat, a little 

 wrinkled, and in tiie last two or three slightly crenate or 

 plaited below the suture; suture not impressed; aperture lat- 

 eral, oval, angulated superiorly, its plane very nearly parallel 

 with the axis of the shell ; peristome simple, thickened within, 



*The figure given of the deatition of L, agrestis by Lindstrom (Gotlands nntida 

 MoUusker, PL I," Fig. 3) disagrees with my observatiou by the bifurcation of the 

 marginals. 



