26 AUSTRALASIAN ANTARCTIC EXPEDITION. 
female are exactly like those of Boecki as figured by Dr. Giesbrecht, but the segmentation 
of the abdomen is in both sexes entirely distinct, if I am right in assigning the two 
forms here figured to the two sexes of one and the same species. The filth pair in the 
male are more simple than in the recognised Metridia, and indeed do not much differ 
rom those of the female except as to size. Abdomen in both sexes four-jointed, the 
first three segments nearly equal in size; fourth nearly twice as long as either of the 
preceding segments; caudal laminee about twice as long as broad, more than half as 
long as the last abdominal segment. The specific name Andrewana is adopted in 
recognition of the assiduous study which Mr. Andrew Scott has for many years devoted 
to the Copepoda, both British and foreign. 
The specimens here noted occurred in gatherings from Stations 6, 7, 8 and 11. 
METRIDIA TRISPINOSA sp. nov. 
(Plate XIV, figs. 12-17.) 
Male—tLength 3 mm. (circa.) The anterior antennz are very slender and 
almost destitute of marginal setee, except towards the base; the basal joints have not 
the rugose aspect which characterises most species of this genus, but the second, fourth 
and sixth segments have each a sharp spine at the distal extremity; the hooks at the 
base of the second endopodite are strong and well developed; the first (genital) segment 
of the abdomen is equal in length to the combined length of the two following segments, 
but shows an imperfect division in the middle, the last segment has two sharp back- 
wardly-directed spines on its anterior surface; furcal laminze three times as long as 
broad. Fifth pair of feet in the male very stout, the basal portion three-jointed, with 
prehensile apical processes; (mutilated in these specimens). 
Two specimens only have been seen, both of them imperfect—taken at Stations 
10 and 11. 
Genus PLEUROMAMMA Giesbrecht, 1898. 
PLEUROMAMMA WOLFENDENI sp. nov. 
(Plate VIII, figs. 10-18.) 
Female.—Basal joints of the anterior antenn strongly spined marginally; 
exopodites of all the swimming feet bi-articulate, endopodites one-jointed ; endopodites 
Of the second pair slightly emarginate at the base, with a small subjacent spine; first 
joint of the fourth exopodite much produced externally, forming a prominent hook-like 
projection which ends in a sharp spine; fifth pair of feet somewhat like those of 
P. gracile, the terminal joints not cleft but bearing irregular fascicles of short bristles; 
abdomen stout, composed of three segments, the third equal in length to the combined 
anterior segments; “eye spot” situated on the right side of the thorax, circular, 
composed of three coalescent pigment cells. Apical spines of the exopodites lancet 
shaped, scarcely half as long as the last joint, 
