476 Transactions.—Zoology. 
eoverer, M. Goudot. This species was noticed almost almost contempo- 
aneously by M. Milne-Edwards, * and subsequently described at greater 
length and well figured by him, + under the name of A. madagascariensis. 
Of this species, unfortunately, no specimens are in the collection of the 
British Museum ; but the published descriptions and figure suffice, I think, 
to show that the genus is well characterized by its robust form, powerful 
anteriorlegs, with broad hands and short palm, and the position of the 
antenne, which are inserted beneath the antennules and are furnished with 
a small or rudimentary basal scale. 
In the genus Paranephrops of White,] as exemplified in the typical 
species P. planifrons, which is also the commonest species of the genus, the 
body is comparatively slender, the anterior legs elongated, with the palm 
more than twice as long as broad, and clothed externally with longitudi- 
nally seriate tubercles and spines; moreover the antenne are inserted ew- 
ternally to the antennules, and are furnished with a very large basal scale, 
which is longer than the peduncle of the antennz. It is true that in other 
species of both genera (as, for example, Astacoides serratus, Shaw, and A. 
franklinii, Gray, from Australia, and Paranephrops zealandicus, White) the 
distinctive characteristics are somewhat less strongly marked; but so far 
as the materials in the collection of the British Museum afford means of 
comparison, I ean see no necessity for uniting the genera. 
Professor Wood-Mason refers, I believe, to Paranephrops zealandicus, 
White, $ in speaking of ** Astacoides zealandicus ;' but this species is cer- 
tainly distinct from P. setosus, Hutton.| In P. zealandicus, of which the 
type specimens are in the British Museum collection, the hands are clothed 
externally with tufts of hair, arranged in longitudinal series, and are armed 
with spines only upon the superior margins, and the sides of the carapace 
are smooth. In P. setosus there are spines arranged seriately upon the 
external surface as well as the upper margin of the hand, and the branchial 
and hepatic regions of the carapace are armed with numerous unequal 
conical spines. A specimen agreeing well with Hutton’s description is in 
the National collection. 
I may say, in conclusion, that a somewhat analogous mode of attach- 
ment has been observed among the Edriophthalmata, in the case of the 
* “ L'Institut," p. 152 (1839). 
t “ Archives du Muséum d'Histoire ES IL, p. 35, pl. iii.cfigs. 1-4 (1941). 
1 “ Zoological Miscellany,” IL, p. 79 (184 
$ Astacus zealandicus, White, ** P.Z.S.,” i p. 123; “ Ann. and Mag. Nat. Hist.," 
ser. 2, i, p. 225 (1848) ; Paranephrops zealandicus, Miers, ** Zool. * Ereb.’ and * Terr," 
Crust., p. 4, pl. ii., fig. 2 (1874); “ Cat. New Zeal. Crust.," p. 73 (1876). 
|| * Ann. and Mag. Hist.," Ser. 4, Vol. XII., p. 402 (1873). 
