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.) 



Jaw: 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). 



FIG. 44. 

 Jaw of LIMAX FLAVUS Linne. (After Binney.) 



Radula formula : V -f V +i+ V 6 + V (60 - I - 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 its apex. 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 max- 

 imus 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 



