[McMURRICH] PLANKTON OF BRITISH COLUMBIA COAST 83 
be counted; in the male the right antenna is slightly dilated in its mid- 
dle part but does not bear any denticulate grasping lamella. Posterior 
antenne with the inner ramus nearly or quite as long as the outer 
one, which is confluent with the second basal joint. 
Masticatory portion of the mandible with 5 teeth, of which the 
3rd and fourth are bicuspid, the others simple. The outer ramus of 
the 1st-4th thoracic limbs 3-jointed, the inner ramus of the 1st 
limb 3-jointed and that of the 2nd and fourth limbs 2-jointed. Fifth 
limb in the female almost symmetrical, with both inner and outer 
rami, each consisting of a single joint; in the male asymmetrical, 
the right one being larger than the left, with no inner ramus and a 
simple single-jointed outer ramus. 
“Paralabidocera amphitrites n. sp. 
The individuals upon which this species is founded were three in 
number two females and one male. Many additional examples were 
found, which from the general form of the body, the arrangement of 
the eyes and other particulars were evidently identical, but immature, 
and not presenting in all respects the characters that may be regarded 
as adult. Neither of the presumably adult females carried ova or 
spermatophores, and there is consequently a possibility that even they 
had not quite reached the adult stage. This possibility, however, 
seems so slight that it may be disregarded. 

Fig. 8. Paralabidocera amphutrites, from dorsal surface. 
