294 



ISOPODA. 



NORM A LI A. 



Genus CIROLANA. (Leach.) 



Generic character. Pereiopoda formed for progression, each 

 terminated by a slender nearly straight dactylos ; lower antennae 

 long ; superior short, cylindrical ; pleon formed of six distinct 

 segments; eyes small, granulated; head with submarginal 

 channels. 



THE 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 antennae ; 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 antemise 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 antennae 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 antennas 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 "Regne Animal." 



The mandibles are strong, angulated beyond the 



