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HORN EXPEDITION—CRUSTACEA. 
(9) Limnetis ereniia, sp. nov. (Figs. 30, 31, 32.) 
Cai’apace globose ; unibones indistinct, near anterior; dorsal edge very slightly 
convex. Surface of carapace very 
finely reticulate, the interspaces being very 
shallow. No lines of growth. Translucent. Spirit specimens pale horny. 
Measurements 
OF Average Examples. 
Length. 
Height. 
Thickness. 
Male - 5 mm. 
4 mm. 
3'5 mm. 
Female - 5-5 „ 
... 4-5 „ 
4 „ 
Head resembles that of Z. jnacleayana (King) in general appearance and 
structure, but is clearly separable from that species and from Z. tatei (Brady) by 
the shape of the rostrum. Seen from the front it is more constricted in the 
middle than in either of the former .species, and as in them the termination is 
rounded in the female and truncate in the male. The eyes are distinctly separate 
from one another, and below and in front of each is a small finely setose patch. 
Owing to the truncation of the rostrum in the male there is no sharp angle formed 
between the inner surface of the rostrum and the lower surface of the labrum. 
The second antennee have from twenty-four to twenty-seven joints in the 
distal portion, each joint being provided with a long plumose seta. 
The female has twelve pairs of feet, but owing to the poor state of preserva¬ 
tion of the specimens it was found impossible to count them in the males. The 
lirst leg in the male has the movable claw sharply bent at right angles at about 
half its length. This claw bites against a rounded pad of very much larger size 
than that described by Sars in Z. vuideayana and Z. taiei. The other appendages 
resemble those of the above species as described by Sars. 
Locality. —Cooper’s Creek (S.A. Museum). 
Astacopsis. 
(10) Astacopsis bicarinatus, Gray. 
The specimens differ from the form found near Melbourne in one or two 
particulars, but not sufficiently, apparently, to make the definition of a new species 
advisable. The rostrum, viewed from above, has a convex outer border, whereas 
the Victorian form usually has the sides of the rostrum straight. A series of 
twenty-six specimens from Melbourne afforded one example which exhibited a 
