294 EGIDA. 
ISOPODA. AGIDA. 
NORMALIA. 
Genus—CIROLANA. (Leach.) 
Generic character. Pereiopoda formed for progression, each 
terminated by a slender nearly straight dactylos ; lower antenne 
long; superior short, cylindrical; pleon formed of six distinct 
segments; eyes small, granulated; head with submarginal 
channels. 
Tue animal is elongated and cylindrical-ovate; the 
head is semicircular (owing to the deep emargination of 
the following segment), with a minute triangle interposed 
between the base of the upper antenne ; it is also marked 
with an impressed line on each side near the outer orbit 
of the eyes, and another finely impressed line runs closely 
parallel with the anterior margin. The eyes are small, 
but strongly granulated. The upper antenne are scarcely 
more than half the length of the head, the two basal 
joints broad and rather flat, the flagellum small, conical, 
and with about ten articulations; the upper antennze are 
inserted beneath the latter ; the two basal joints are short ; 
the third, fourth, and fifth more elongated, and the flagel- 
lum is long and slender, composed of more than thirty 
articuli, extending as far as the third or fourth segment 
of the body; this lower pair of antennez are separated 
at the base by a narrow elevated ridge, arising from a 
small triangular piece which rests upon the front margin 
of the transverse emarginate labrum. 
Careful figures of the mouth-organs of C. hirtipes are 
given by M. Milne Edwards in the Crochard edition of 
the “ Régne Animal.” 
The mandibles are strong, angulated beyond the 
