. Zoologischer Anzeiger 
herausgegeben 
von Prof. J. Victor Carus in Leipzig. 
Zugleich 
Organ der Deutschen Zoologischen Gesellschaft. 
Verlag von Wilhelm Engelmann in Leipzig, 
XVI, Jahrg. 11. September 1893. No, 428. 
Inhalt: I. Wissenschaftliche Mittheilungen. 1. Cockerell, Notes on Peripatus jamaicensts, 
Grabh. and Ckll. 2. Giglioli, Di una nuova specie di Macruride appartenente alla fauna abissale 
del Mediterraneo. 3. Ihering, Zum Commensalismus der Pseudoscorpione. 4. Braun, Über die Disto- 
men in der Leber der Hauskatzen. 5. Mayer, Berichtigung. 6. Knauthe, Ichthyologische Notiz. 
II. Mittheil. aus Museen, Instituten etc. Linnean Society of New South Wales. IIE. Personal- 
“ Notizen. Vacat. Litteratur. p. 229—244. 
I. Wissenschaftliche Mittheilungen. 
1. Notes on Peripatus jamaicensis, Grabh. and CklI. 
By T. D. A. Cockerell, Las Cruces, New Mexico, U.S. A. 
eingeg. 20. Juni 1893. 
The Jamaican Peripatus was discovered by Gosse, lately redis- 
covered by Mrs. E. M. Swainson, and described briefly as a new 
species in »Nature«, Sept. 29, 1892, p. 514. In the »Journal of the 
Institute of Jamaica«, Jan. 1893, it was figured, and some further 
particulars given about it by Dr. Grabham. The following notes are 
intended to supplement what has already been published, and to give 
a more exact account of the animal. 
In August, 1892, Mrs. Swainson sent me two specimens, both 
alive, which she had found on Beacon Hill. These represented the 
two colour-mutations presented by this Peripatus, which may be 
designated as follows: — 
1) mut. Gossei. Reddish, with the ends of the antennae white. 
2) mut. Swainsonae. Blackish, antennae not tipped with white. 
At first it seemed probable that these colour-differences might be 
sexual, but as females were found subsequently of both forms, this 
cannot be the case. The very different appearance of the two, and the 
absence of any intermediate forms, suggests two distinet species, but 
this again is impossible, as Dr. Grabham has dissected embryos of 
one form out of the body of a female of the other. Neither is the 
difference due to age, as adults were found of both. Consequently we 
have a very distinet and interesting case of colour variation, and 
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