156 THE HON. PAUL A. METHUEN ON [Feb. 1, 



no males were taken. It was found with the other Cyprida? in 

 Lake Chrissie in the shallow marginal parts of the lake. 



Cypris tuberculata, sp. n. (PI. XIII. figs. 24-28, & PI. XIV. 

 Jigs. 29, 30, 33.) 



Length L9 mm. Height, anterior portion 1 -65 mm., central 1 -50 

 mm., and posterior L53 mm. External appearance: the shell has 

 rather an exceptional appearance. It is covered with tubercles 

 and short spines ; the arrangement of these processes in no way 

 resembles that found in C. spinosa ; moreover, those parts not 

 bearing tubercles or spines have everywhere small indentations, 

 giving the appearance of beaten copper. The fore-part of the 

 shell bears a few hairs irregularly arranged. The marginal edge 

 is provided with hairs along most of its length. From the 

 side, the outline of the shell is seen to have a slight anterior 

 prolongation . 



Appendages. — The antennule is typical of the fa,mily Cypridse. 



The antenna : the swimming-hairs do not extend beyond the 

 bristles of the distal segment. The arrangement of the minute 

 hairs on the second and third joints resembles that found in 

 C. spinosa, but differs chiefly in the absence of hairs just behind 

 the basal attachment of the swimming process on the second 

 joint. Denticulations, as in G. gunningi, found on third joint. 

 Distally only three curved serrated seta? are present. 



The mandibles : an external serrated seta is present on the 

 gnathobase ; a comb-like structure is found on one of the 

 external biting lobes of the same. The palp is provided' with 

 a very strong plumose bristle which is conspicuously larger than 

 any of the other bristles and seta which it has in addition ; 

 the structure as a whole bears most resemblance to that of 

 C. gunningi. 



The maxillula from the point of view of classification is of 

 most importance, in that no foliaceous hairs are present on the 

 biting processes, although the two large bristles characteristic 

 of the genus are present. The first biting process is provided 

 roughly with a dozen and a half bristles, all smooth save two 

 which are longer than the rest and serrated ; at the basal 

 extremity on the inner surface of this process arise two hairy 

 bristles. The second biting process does not differ much from 

 the first ; but the long serrated bristles of the first are in this 

 case absent. The third biting process is remarkable in possessing 

 no foliaceous setse. The two stout bristles shown in fig. 27 

 represent the foliaceous seta? found in the genus Cypris, the 

 small grooves noticeable on these structures possibly indicating 

 the remains of the reduced " pinnae." This same character is 

 also found in C. virens described and figured by Claus (1), but 

 in this case the bristles are smooth. The palp resembles that 

 of G. gunningi, the only difference between the two being that 

 the short hair on the first segment is replaced by a longish one. 



The maxilla : the exopodite is furnished with fifteen stout 



