279 
Mr. T. D. A. Cockerell’s Notes on Slugs. 
1) Prophysaon humih . — I do not feel certain that the cha- 
racter of 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 pacificum observed may be partly due to 
postmortem contraction. Possibly Jlavum is a variety 
of pacificum . 
(3) Prophysaon Andersoni , Coop., has priority over P. Hemp - 
hi IK, B. & B., and I cannot detect any specific differ- 
ence between them. P. Andersoni , W. G. B., 
belongs to Fasciati , and is P . fasciatumy Ck.ll. 
(4) Plienacarion is very near to Prophysaon ; indeed it is 
most difficult to separate P. foliolatum and Pr. Hemp - 
hilli specifically. I 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 . Hemphilli is regarded as distinct 
from Andersoni , then P. ( Phen .) Hemphilli will require 
a new name. 
(5) Anadenulus Cockerelli. — 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 Anadeni are Asiatic. The 
genital orifice in true Anadenus is quite a long way 
from the right eye-peduncle, as in Ariolimax. 
(6) Ariolimax columbianus and californicus are hardly to be 
separated as species ; californicus 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. Andersoni , W. G. B., is a doubtful species, probably 
a variety of A. niger . The u foliated appearance” is 
not specific, as it occurs also in A . niger . 
Ariolimax costaricensis , subsp. nov. 
A. californicusy subsp. — Length 68 millim. (in alcohol), 
mantle 27 millim. long, respiratory orifice 19 millim. from 
20 * 
