Mr. T. D. A. Cockerell's Notes on Slugs. 279 



1) Prophysaon humUe. — I do not feel certain tliat the cha- 

 racter ot" the jaw is really specific ; it may be an 

 aberration, but this cannot be settled until we have a 

 series of specimens to examine. I have placed the 

 type specimen in the British Museum. 



(2) Prophysaon jlavum. — The difference between the sole of 

 this and j^acificwni observed may be partly due to 

 postmortem contraction. Possibly ^aywm is a variety 

 of pacificum. 



(}\) Prophysaon Andersoni^ Coop., has priority over P. Ilemp- 

 hillij B. & B., and I cannot detect any specific differ- 

 ence between them. P. Andersoni, W. G. B., 

 belongs to Fasci'att, and is P. fasctatum, Ckll. 



(4) Phenacarion is very near to Prophysaon ; indeed it is 



most difficult to separate P. foliolatum and Pr. Ilemp- 

 hilli specifically. 1 have not seen any good material 

 of Phen. Hemphilli^ W. G. B., but it appears to be a 

 distinct species. If Phenacarion is not kept as a 

 genus and Proph. HemphilU is i*egarded as distinct 

 from -4?^f7erso7^^*, then P. [Phen.) Remphilli will require 

 a new name. 



(5) Anadenulus CockerelU. — I at first referred this species, of 



which I saw the types, to Anadenus ; but it is really 

 distinct enough to be separated from it, besides being 

 American, while the true Aiiadeni 2ixe, Asiatic. The 

 genital orifice in true Anadenus is quite a long waj 

 from the right eye- peduncle, as in ArloKmax. 



(()) Ariolimax columhianus and caUfornicus are hardly to be 

 separated as species ; caUfornicus is more keeled and 

 has a narrower sole. A. Hecoxi, a third species from 

 the United States, has never been described, and 

 cannot be recognized. Mr. Binney informs me it is 

 a large species. 



(7) Ar. Andersom, W. G. B., is a doubtful species, probably 

 a variety of A. niger. The " foliated apuearance " is 

 not specific, as it occurs also in A. niger. 



Ariolimax costaricensis, subsp. nov. 



A. caUfornicus, subsp. — Length 68 millim. (in alcohol), 

 mantle 27 millim. long, respiratory orifice 19 millim. froui 



20* 



