302 PROF. W. J. DAKIN ON THE ~ 
shell is reticulate and irregular. The valves are red-brown in 
colour and of firm consistency. 
Rostrum (fig. 21) pointed and moderately long. 
The number of legs is less than 20 pairs. 
Tail of usual shape (fig. 20). The caudal plates have their 
upper margins almost straight. Each plate bears about five equal 
denticles and some smaller ones. 
The caudal claws bear feathered setee on the proximal half. 
Eggs spherical. 
Size. Length of adult female, 8°5 mm. 
The species Cyzicus rufa differs from Cyzicus lutraria in 
(1) Shape of shell—straight ventral margin, convexity of 
anterior end. No compression behind middle. 
(2) Caudal plates not concave dorsally. 
(3) Rostrum of female moderately long. 
(4) Much smaller number of appendages. 
The species differs from Cyzicus elliptica in 
(1) Shell—ridges and shape generally. 
(2) Tail. 
(3) Size. 
(4) Number of appendages. 
The species differs from Cyzicus sarsii in 
(1) Shape of head. 
(2) Shape of shell and number of ridges. 
(3) Caudal plates. 
The species differs from Cyzicus packardi in 
(1) Shell—general shape and lines of growth. 
(2) Shell sculpture. 
(3) Caudal plates. 
Oyzicus dictyon (Spencer & Hall) seems to be synonymous with 
Estheria lutraria. 
There is a possibility that this might be the female of Cyzicus 
sarsit, a species founded by Sayce on one example,a male. The 
differences in the shell, etc., are so great that the author considers 
it more probably a new species. 
Family LyYNCEID&. 
Genus Lynceus. 
Three species of the genus Lynceus have been recorded from 
Australia, and of these none is supposed to occur in Western 
Australia. 
The record that I have to note therefore shows still further 
that the supposed absence of East Australian species of Phyllopoda 
