CAPRELLA. 49 
AMPHIPODA. CAPRELLIDA. 
ABERRANTIA. 
Genus—CAPRELLA. 
Caprella Lamarck, Hist. des Anim. sans Vert. p. 165. Leacu, Linn. 
Trans. xi. p. 363. Mitne Epwarps, Hist. des Crust. iii. 
p. 105. Kroyer, Nat. Tidssk. iv. p. 496. 
Aygina. Kréyrr, Nat. Trpssk. iv. p. 509. 
Podalirius. Kroyer, Nat. Tidssk. 2 Ser. i. p. 283. 
Generic character. Cephalon confluent with the first seg- 
ment of the pereion. Pereion cylindrical, with the last two 
segments shorter than the two preceding; in the male the 
first two segments are long, in the female they are shorter. 
Pleon rudimentary. Appendages of the cephalon normal. 
Gnathopoda subchelate; in the male the second pair of 
gnathopoda articulates with the pereion near the middle or 
posterior extremity of the second segment, in the female at 
the anterior extremity of the same segment. First two pairs 
of pereiopoda wanting. Three posterior pairs subequal, and 
placed near to each other. One or two pairs of pleopoda rudi- 
mentary, the rest obsolete. 
Tue head is confluent with the body. In the male the 
first segment of the body is longer than in the female, 
and the first pair of legs are always attached at the ante- 
rior extremity. The second segment is longer in the male 
than in the female, and we are strongly inclined to be- 
lieve that it increases in length with the age of the 
animal. The second pair of legs always articulate, in 
the female, at the anterior extremity of this segment ; 
whereas in the male they are affixed farther back, and 
generally posteriorly to the centre of the segment, and 
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