
36 CAPRELLID &. 
AMPHIPODA. CAPRELLID&. 
ABERRANTIA, 
Genus— PROTO. 
Proto. Leacu, Linn. Trans. xi. p. 362, 1814. Desmarzst, Consid. 
sur Crust. p. 276, 1825. Spance Bartz, Cat. Amph. Brit. 
Mus. p. 349. 
Leptomera. LAtRetu.n, in Cuvrer, Régne Animal, Ist ed. iii. p. 51, 1817. 
DesmAREsT, Consid. sur Crust. p. 275. GurErin, Icono- 
graph, R. An. Crust. pl. xxviii. fig. 3. Kroyer, Nat. 
Tidsk. iv. p. 496. Minne Epwarps, Hist. des Crust. iii. 
p. 109. Gossr, Mar. Zool. i. p. 131, 
Naupredia. Larrerniz, in Cuvier, Réegne Animal, 2nd ed. iv. p. 128. 
Cours d’Entomol. p. 893. Van Bunepen, Faune litt. de 
Belgique. 
Generic character. Cephalon confluent with the first seg- 
ment of the pereion. Pereion having the last joint shorter 
than the preceding, cylindrical. Pleon rudimentary. Gnatho- 
poda subchelate. Three anterior pairs of pereiopoda short and 
feeble, last two long and powerful. 
In this genus the head is small and globular, and so 
closely attached to the first segment of the body that it 
can only be distinguished from it by close observation. 
The body is cylindrical, and the tail is rudimentary. The 
eyes, antennz, and organs forming the mouth are similar 
to those in the group Normatta, but the legs have the 
first joint closely fused with the respective segments to 
which they are attached. In this respect we perceive a 
resemblance to the development of the same parts in the 
highest organized decapods. Many genera of the Bra- 
chyura have the coxz as closely anchylosed with the 
pereion as we here see exhibited in animals at the oppo- 
site extremity in the scale of development. The first 
two pairs of legs are subchelate, the second being the 
larger. The next four pairs are equidistant from each 
