CCXXXll 
APPENDIX. 
upper pair having a small seta at the base of the fourth articulation ; legs 
fourteen, two first pair with a large compressed monodactyle hand, those of the 
anterior pair being smaller than the others ; third and fourth pairs of the same 
length as the preceding, slender, terminating in a nail ; the three posterior 
pair directed backward, similar in formation, but differing in size, the middle 
and longest pair being as long as the body, and the seventh pair shorter 
than the fifth, all terminating in a nail; colour in some individuals pale, in 
others varied red and white. 
This species differs from the Oniscus Serratus of Fabricius, Faun. Green. 
No. 237, in the length and relative proportion of the legs, the three posterior 
pairs of the Serratus being described as shorter than the third and fourth pairs, 
whereas those of the Loricatus are much longer, the sixth pair are indeed more 
than twice as long as either the third or fourth pairs : it also differs in many 
essential respects from the Gammarus Carinatus, Fabricius, Ent. Syst. 2, 515, 
(Atylus Carinatus, Leech, Zool. Misc. ii, t. 69.) as may be seen on com- 
paring it with the figure of the Carinatus in the Zool. Misc,; (the latter 
is stated by Dr. Leach to have been taken from the identical specimens 
to which Fabricius attached the name of Carinatus ;) the upper antennae of 
the Carinatus are shorter than the lower, which, in the arrangement of La- 
marck, is not merely a specific but a generic difference. The present species 
is sufficiently distinguished by the rostrum from the Gammarellus Pulex,. 
Herbst. 230, t. 36. fig. 4* and 5. 
Gammarus Sabini. 
Leach in Ross’s Voyage, Ed. 8vo., Vol. 2, page 178. 
G. segmentis dorsalibus postice falcato productis, capite inter antennas acumine minuto. 
Plate I, fig. 8 — 11- 
On the shores of Baffin’s Bay, but not met with in the Polar Sea : the 
head of this species which terminates in a point between the antennae, instead 
