COCKKRELL : ARION OCCIDENTALIS. 



^93 



The specimen described is now in the British Museum. 

 Mr. Horsley wrote that he thought the species was not rare in 

 the original localit)'. The only other Avion he found in the 

 neighbourhood was A. empiricorum at Pau. He sent me a fine 

 example of the bright red var. lamarcldi Kal., and wrote that 

 the species was ' very common and large — always the same 

 colour except, I think, a few brown.' Liinax niargiiiaius (form 

 typiis L. & P.) was common on trees at Pau and three were sent. 



At one time I thought that A. occidentalis might be a 

 variety of A. alpiiius Poll., but Mr. PoUonera kindly sent me 

 specimens of that species, which is really quite different.* In 

 many respects the new species is like A. hoj'tensis, but I feel 

 sure it is not a variety of that ; nor does it agree with any of 

 the subfiiscus group. Now that it is described, perhaps further 

 specimens will be found, and the validity of the species con- 

 firmed, or otherwise, by other observers. 



Institute of Jamaica, Kingston, Jamaica, Nov. ij, i8g2. 





ttb.vst^ 



v.dL 



Banding on mantle. 



A. occidentaiis. 



A. nl/>?'}j7is. 



[To ensure complete accuracy, we reproduce in fac-simile the author's 

 original pen-and-ink drawings. — Eds.] 



'■'A. alpinus may be recognised more especially by the strong outward flexure of the 

 bands on the mantle, posterior to the respirator)' orifice. In occidentalis they are nearly 

 straight. 



M 



