MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSGA. ng 
Milax gagates (Draparnaud). 
1801 Limax gagates Draparnaud, Tabl. Moll., p. 100, no. 1. 
1805 - — Draparnaud, Hist. Nat., p. 122, pl. 9, f. 1, 2. 
1824 — maurus Quoy & Gaimard, Voy. Uranie, p. 426. 
1855 — (Amalia) gagates Moquin-Tandon, Hist. Moll., vol. 2, p. 19, pl. 2, £. 1-3. 
1872 — hewstoni Cooper, Proc. Acad. Nat. Sci. Philad., p. 147, plea: 
1855 Milax gagates Gray, Catal. Pulm., p. 174. 
1880 — _ tasmanicus ‘Tate, Proc. Roy. Soc. Tasmania, p. 16. 
1876 Amalia marginata mut. gagates Pini, Bull. Soc. Mal. Ital., vol. 2, p. 107. 
1897 — babori Collinge, Proc. Mal. Soc., p. 294. 
La 
} ISTORY.— Milux gagates (gagates, 
jet), 18 one of our more uncommon 
slugs, and though typically of jet 
black hue, is in this country more fre- 
quently found of a pale plumbeous or 
brownish tint. 
This species was first described by 
Draparnaud in 1801, and was first dis- 
covered in Great Britain by Mr. R. D. 
Darbishire, B.A., F.G.S., of Victoria 
Park, Manchester, who in September 
1851, found a characteristic specimen 
at the foot of a hawthorn hedge, on the 
Isle of Portland, which was identified 
by Prof. Forbes. 
Mr. E. A. Smith, in the Proc. Zool. 
Soc., 1884, p. 276, suggests the proba- 
bility that the Z. capensis Krauss may 
STC. Wa 4 Ko . A prove to be referable to our species ; 
6 ad and Mr. C. I. Musson makes a similar 
suggestion in reference to the L. pectinatus of Selenka. 
Prof. R. Tate has described (Proc. Roy. Soc. Tasmania, 1880, p. 16) a 
Milax nigricolus, which inhabits the gullies of the Adelaide hills, and is 
widely dispersed over the Adelaide plain generally. Though presented as 
a new and probably indigenous species, the author suggests that it may be 
identical with Milax gagates. 
Dr. Simroth considers Amalia doderleini, A. sicula, and A. insularis as 
all synonymous with the present species, and agrees with Heynemann 
in similarly regarding Limax scaptobius of Bourguignat, but as there 
appears to be some conflict of opinion on the subject, their views are 
simply recorded here. 
Diagnosis. —Hxrrrnatiy, Milux gagates is known from its congener 
by its more uniform colouring; by the keel being usually of the same or of 
a darker tint than the body, and by its greater prominence at the caudal 
extremity ; the parallel longitudinal groovings of the body are also quite 
unpigmented, and the intervals between the groovings smooth or deli- 
cately granulate. 
INTERNALLY, it is sharply differentiated by the globose spermatheca and 
the protuberant atrium or vestibule. 
