70 THE NAUTILUS. 



139. Perna alatus Gmel. 



140. Lima scabra Born. St. Kitts. 



141. Semele decussata Gray. St. Thomas. 



142. Semele orbiculata Say. St. Thomas. 



SYNOPSIS OF THE PRINCIPAL VARIETIES OF AGRIOLIMAX 

 AGRESTIS iL.) 



BY T. D. A. COCKERELL. 



As this species is now quite extensively naturalized in America, 

 and varies considerable, it is of interest to ascertain what varieties 

 exist on this continent, and whether they are identical with those of 

 Europe. The following table has been prepared as a guide to the 

 identification of the more usual forms. In some cases varietal 

 names have been interpreted rather more widely than used by their 

 original authors, but a certain amount of modification must be 

 allowed under varietal groupings, just as examples of a species must 

 be admitted to diverge from the original type. 



A. Without Spots. 



(1) Ashy or pale ochreous */j'//a« Less & Poll. 



(2) Reddish-ochre ------ rufesceus Less & Poll. 



(3) Reddish-ochre above, white beneath - - '^succineus Westerlund. 



(4) Yellowish-amber, tentacles bluish-brown - - xanthosoma Fischer. 



(5) Purplish or lilac-brown ------ lilacinus Moq. 



(6) Grey, rather dark - . . griseus Ckll. 



(7) Greyish-white, mantle darker ----- cineraceiisVio^. 



(8) Whitish or nearly white ^albidus Picard. 



(9) Albino ----- albus Ckll. 



(10) Very dark brown -------- tristis Moq. 



(11) Black niger Butterell. 



B. Spotted or blotched. 



{VI) With numerous black or blackish points - - - punctatus Picard. 



(13) With grey or blackish mottling - *j-v/j'rt/'/«« Moq. (non Drap.) 



(14) Often reddish; spots blackish, inclining to reticulation on body 



^retictdattis Moq. 



(15) Grey, with black spots or mottling, tentacles fuscous *va7-ians Westerlund. 



(16) Grey, with black markings tending to coalesce, tentacles dark 



fiigricans Westerlund. 



(17) Reddish-ochre, with obscure brownish mottling or brown spots. 



*obscunts Moq. 



