CAPRELLA LINEARIS. 53 
Cancer (Astacus) atomos? Punnant, Brit. Zool. ed. 1777, iv. p. 17, pl. xii. 
fig. 832. Basrer, Opusc. Subs. pl. iv. fig. 2. 
Cancer (Astacus) punctata. Risso, Crust. de Nice, p. 130. Hist. Nat. 
Eur. merid, v. 102. 
Oniscus scolopendroides. Pauas, Spic. Zool. ix. p. 78, pl. iv. fig. 15. 
Squilla quadrilobata ? Mixer, Zool. Dan. ii. pl. xxxvi. fig. 4-6, male ; 
iii. pl. exiv. fig. 11, 12, female. 
THIs species must be considered as the type of the 
genus. It has the head and back unarmed. In the male 
the first segment of the body is longer than in the 
female, as is also the second segment; the three succeed- 
ing are subequal in length, and a little shorter than the 
second ; the last two are but half the length of the pre- 
ceding. The superior antenne are about half the length 
of the animal, the peduncle being rather longer than the 
flagellum. The inferior antenne are about half the 
length of the superior, reaching scarcely to the ex- 
tremity of its peduncle. The first pair of legs are short, 
and articulate with the first segment of the body at the 
anterior extremity: the hand is ovate, the palm very 
oblique, straight, ciliated, and defined by a prcecess or 
tooth: the finger is serrated, and slightly curved. The 
second pair of legs are a little longer than the first, and 
articulate with the second segment just at the centre, 
but in the female a little more anteriorly ; the hand is 
long-ovate, having the palm defined by a process or 
tooth, tipped with a spine, and armed with a tooth 
situated anteriorly to the centre, and just before which is 
a square-angled tooth or process. ‘The last three pairs of 
legs are short, robust, and have the hand excavated in 
front, and armed with two small spines, which antago- 
nize with the extremity of the finger when closed. 
The incubatory pouch is an appendage which is de- 
veloped when required for the purpose of carrying the 
ova, as shown in the two figures given below. It con- 
