LOCALLY INTRODUCED SPECIES, 453 



is probable that it inhabits all the cities of the sea-coast and their 

 vicinage, and most of the cities of the interior. 



Jaw (Terr. Moll., I, Plate I, Fig. VI) of a light horn- 

 color, its anterior surface not on one plane, but projecting fig-497. 

 towards a strong median vertical carina; arcuate, ends ,, ^ 

 square, striated, concave margin smooth, with a well- jawot i./aws. 

 developed median projection. 



The lingual membrane (Terr. Moll., V, Plate I, Fig. G) of one speci- 

 men* examined has about GO-l-'^O teeth, with 16 laterals. The centrals 

 and laterals are of the same type as in L. maximus ; the outer marginals 

 are also bifid. On other portions of the same membrane the cutting 

 points are longer and sharper. Fig. c represents an extreme marginal. 



The genital system, as well as full anatomy, is figured by Leidy in 

 Terr. Moll., I, Plate I. The testicle (1), composed of a globular mass of 

 aciniform cceca, is not imbedded within one of the lobes of the liver. 

 The penis sac (4) is long, stout, cylindrical, receiving the vas deferens 

 (2) and retractor muscle (5) at its apex. The genital bladder (8) is 

 small, elongated-ovate, with pointed apex and short duct. 



Liinax agrestis, Linn. 



Color varying from whitish through every shade of cinereous and 

 gray to black, and through various Pio. 493. 



shades of yellowish or amber-color 

 to brownish, and sometimes irregu- ^^^^^ 

 larly spotted with small black points Umax agresus. 



or dots ; eye-peduncles and tentacles darker than the general surface, 

 sometimes black; mantle sometimes mottled with a lighter color; base 

 of foot sallow white ; sheath of eye-peduncles indicated by black lines 

 extending backwards from their base under the edge of the mantle. 

 Body when in motion cylindrical, elongated, terminating acutely, the 

 sides towards its posterior extremity compressed upwards, so as to 

 form a short carina or keel ; foot very narrow. Mantle oblong-oval, 

 fleshy, convex, and prominent, rounded at both extremities, equaling 

 in length one- third of the length of the body, its surface marked by 

 prominent, irregularly waved, concentrical lines and furrows having 

 their center on the posterior part, and its edges free throughout the 

 whole circumference. Upper surface of the body marked with longi- 



* L. & Fr.-W. Sh. N. A., I, p. 63, fig. 105, is no doubt L. agreKlis. Fig. (5, p. 285, of 

 Ami. Lye. N. H. N. Y., Vol. IX, would more correctly repieeent the dentition of this 

 species if the extreme marginals were bifid. * 



