198 THE CHICAGO ACADEMY OF SCIENCES. 
(when extended) elongate cylindrical, with a short, prominent 
keel; dorsal portion of body covered with numerous long, nar- 
row, well-marked tubercles; foot long and narrow, yellowish 
white in color; sides of body without spots. The spots some- 
times extend down the center of the back. 
Length, 86.00; width, 10.00 mill., extended. (9355.) 
Faw: Strongly arched, horn-colored, anterior surface 
with a strong carina; ends square or only slightly rounded; 
concave margin smooth, with a well-marked median projection; 
anterior surface strongly striate vertically, and faintly striate 
longitudinally (Fig. 44). 
Fic. 44, 
Jaw of LIMAx FLAvus Linné. (After Binney.) 
Radula formula: 44+148-+4+15+44 (60—1—60); the teeth 
are in all essential respects like those of maximus, except that 
the cutting points are longer. There are about 100 rows of 
teeth. 
Genitalia: ‘The testicle, composed of a globular mass of 
aciniform cceca, is not imbedded in one of the lobes of the 
liver. The penis sac is long, stout, cylindrical, receiving the 
vas deferens and the retractor muscle at itsapex. The genital 
bladder is small, elongated-ovate, with pointed apex and short 
duct.” (W. G. Binney.) 
Distribution: Same as maximus, with the addition of Bale- 
aric Islands, Brazil and Australia. 
Habitat: Similar to maximus, but not so common. 
Remarks: This species is at once distinguished from maz- 
zmus by the absence of color spots and by the larger size of the 
tubercles. It is an introduced species and is fast spreading 
over the United States. Its habits are like those of maximus. 
Genus AGRIOLIMAX Morch. 
“Animal keeled only posteriorly. Mantle concentrically 
striated, the center of striae being somewhat to the right of 
the median line. There are no bands, and if spots are present 
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