THE NAUTILUS. 63 



appeared) to extend to the very posterior end of the sole, and each 

 wave starts there. 



0. inornata (Say). Foot very long and slender; zones rather 

 distinct, narrow, but widening to nearly the whole width of the sole 

 at the anterior end. Apparently there is au additional marginal 

 zone along each margin, quite narrow and whitish. Waves distinct 

 in the median zone, about 10 simultaneously. 



0. lavlgata perlcevis (Pils.) (from Ky.). Three zones slightly 

 marked, not in color, which is grayish with a slight olive tinge. 

 Waves plainly visible, about 8. 



Vitrea [= = Hyalina\ wheatleyi (Bid.). Sole very narrow ; zones 

 rather distinct, even with slight furrows marking them when the sole 

 is detached ; the median about the width of the marginals, in the 

 middle, wider near the anterior end. Waves distinct in the anterior 

 two-thirds (as in radiatuld). 



V. draparnaldi (Beck). Sole narrow ; three zones distinct, the 

 median slightly wider than the marginals, very narrow posteriorly, 

 and not reaching the posterior end. Here also, when the sole is de- 

 tached from the substratum, there are two rather deep sulci between 

 the zones. Waves distinct, 8-10, in rapid succession ; anterior end 

 of the foot progressing with a slight jerk as each wave reaches it. 

 Margin of the foot above marked off by two longitudinal furrows (on 

 each side). 



Gastrodonta intertexta (Binn.). No zones marked, not a trace of 

 waves, just as in G. ligera. The margin of the foot above, outside 

 of the longitudinal furrow, is rather broad and of a more yellowish 

 tinge than the balance of the dorsum. 



G. suppressa var.? l No zones, and no waves seen, even in direct 

 sunlight, transmitted. 



Euconulus chersinus (Say). No waves seen ; no zones on the sur- 

 face ; zones slightly marked internally in transmitted light (as it 

 would be in all snails). 



Limacidce. 



Limax maximtts L. Sole with three zones rather sharply defined, 

 the median rather narrower than the marginals. Waves very dis- 

 tinct, about 20 in large specimens, from very near the tail end, each 



father large, with higher spire; a heavy deposit (callus) in the last vrhorl 

 near the aperture, but no lamella? ; may be distinct. 



