AMPHIPODA OF THE BRITISH ISLES. 155 
senting the form from which the subterranean species of Cran- 
gonyx in Europe is probably derived. Nearly allied species are 
found in the surface and underground waters of North America, 
and were formerly assigned to the genus Crangonyx, though most 
of them have now been placed in new genera by Mr. Stebbing. 
CRANGONYX SUBTERRANEUS, Spence Bate. (Plate 18. figs. 4.) 
1859. Crangonyx subterraneus, Spence Bate, Proc. Dublin Univ. Zool. & 
Bot. Assoc. i. p. 240; Nat. Hist. Rev. vol. vi. p. 166, fig. 3. 
1861. Crangonyx subterraneus, Hogan, Rep. British Assoc. (1860), 
pp. 166-169. 
1862. Crangonyx subterraneus, Spence Bate, Cat. Amphip. Brit. Mus. 
p. 178, pl. xxxii. fig. 6. 
1863. Crangonyx subterraneus, Spence Bate & Westwood, Brit. Sessile- 
eyed Crust. i. p. 327. 
1890. Crangonyx subterraneus, Wrzesniowski, Zeitschrift fiir wissenschaft- 
liche Zoologie, L. 4, p. 697. 
1893. Crangonyx subterraneus, Della Valle, Gammarini del Golfo di 
Napoli, p. 681. 
1896. Crangonyx subterraneus, Vejdovsky, Sitz. kegl.-bdhm. Gesellschaft 
der Wissenschaften, 1896, x. pp. 3-32, pls. i. & ii. 
1896. Gammarus puteanus, Hamann, Europaische Hohlenfauna, p. 234, 
(in part). 
1899. Eucrangonyx Vejdovskyi, Stebbing, Trans. Linn. Soc., Zoology, 
ser. 2, vil. p. 423. 
Specific diagnosis.—First four side-plates nearly as deep as 
their respective segments, the fourth much the largest, being 
about twice as long as the third ; the lower margins of all convex 
and supplied with a few sete. 
Superior antenne about one-fourth the length of the body; 
the flagellum of about 12 joints; secondary appenaage of two 
slender joints, the first much longer than the second. 
Inferior antenne with the flagellum of 4 joints, the articula- 
tions between them slightly oblique. 
Mandible with the palp rather broad, its second joint half as 
broad as long, its inner margin being produced and convex. 
First gnathopod rather shorter than the second, carpus sub- 
triangular, much shorter than the propodos: the propodos 
subquadrate, length of anterior border one and a half times the 
breadth ; palm oblique, defined by a stout spine, and supplied 
along its length with peculiar sete split at the ends. The second 
gnathopod similar, but with the anterior border of propodos 
twice the breadth of the joint, and the palm rather more oblique. 
