. AMPHIPODA OF THE BRITISH ISLES. 151 
1862. Miphargus Kochianus, Spence Bate, Cat. Amphip. Brit. Mus. p. 177, 
pl. xxxii. fig. 3. 
1863. Niphargus Kochianus, Spence Bate & Westwood, Brit. Sessile-eyed 
Crust. i. p. 528. 
1889. Gammarus Kochianus, Moniez, Rev. Biol. du Nord de la France, 
1. p. 48. 
1890. Hip hoctou Kochianus, Wrzesniowski, Zeitschrift fiir wissenschaft- 
liche Zoologie, L. 4, p. 674. 
1893. Miphargus Kochianus, Della Valle, Gammarini del Golfo di Napoli, 
p- 704 (2 part). 
1896. Gammarus puteanus, Hamann, Kuropiische Hohlenfauna, p. 234 
(in part). 
Specific diagnosis.—Body less slender than in NV. subterraneus, 
first four side-plates as deep as their segments. 
Second and third segments of pleon with posterior angles 
acute, that of the first rectangular. 
Superior antenna about two-thirds the length of the body, 
slender; third joint of peduncle more than half as long as the 
preceding joint; flagellum containing about 16 joints, secondary 
appendage of two slender joints, as long as the first two joints 
of the main flagellum. 
Inferior antenna with the last two joints of peduncle equal, 
rather slender; flagellum of about 8 joints, half as long again as 
the last joint of peduncle. 
Maxillipedes with the lobes large, inner lobe reaching con- 
siderably beyond the distal end of the inner margin of the meros, 
and the outer lobe reaching as far as the end of the carpus. 
First gnathopod shorter and rather stouter than the second ; 
basos not specially broadened ; carpus as long or longer than the 
propodos ; propodos subquadrate, widest distally where the width 
is rather greater than the length; palm transverse, produced 
anteriorly as it approaches the inferior angle, so that this is 
rather less than a right angle, defined by a stout spine with a 
smaller one at its base; dactylos fitting closely on to the palm, 
convex border with only one or two sete. 
Second gnathopod slender ; carpus much longer than propodos, 
its inferior margin not much shorter than the anterior, and 
supplied with five tufts of sets; propodos as in first gnathopod, 
but narrower, its articulation with the carpus very narrow. 
Terminal uropoda about one-fifth of the length of the body; 
outer branch with the first joint about four or five times as long 
as the peduncle, and supplied with three or four tufts of sete ; 
