TWO SPECIES OF CTJilACEA IN NEW ZEALAND. 23% 



Four visible 

 thoracic segments. Six abdominal segments. 



Carapace. 



39 4, 5, 11, 8 li, U, 15, 14, 20, 13 



As ia C. australis each segment is furnished on its antero- 

 lateral margin with an acute knob-like process, which fits into 

 and hinges with a notch on the posterior margin of the preceding 

 segment. 



The antenmdce (PL XVL fig. 4 a^) bear a general resem- 

 blance to the same organs in C. australis, having a 3-jointed 

 peduncle, of which the basal joint is large and broad in com- 

 parison with the two which succeed it. The flagellum also is 

 2 -jointed, and bears at its extremity two long setse. Of the 

 second flagellum, which occurs in a rudimentary form in other 

 species of the genus, I have failed to find any trace in this 

 species. 



The antennce (PI. XVI. fig. 4«') in the female are rudimentary, 

 consisting of a broad base bearing on its inner face two plumose 

 setae, and — at the extremity of its distal part which projects almost 

 at right angles from its proximal end — tapering to a small conical 

 joint tipped with three minute setae. In the male (fig. 5) the 

 antennae are furnished with a basal joint, with which the rest 

 of the organ articulates at right angles. The distal portion of 

 the peduncle consists of two joints, of which the second is nearly 

 three times as long as the first, and bears a very long multi- 

 articulate flagellum. In the specimen figured, in which it is 

 evident that a portion has been broken off", the flagellum is about 

 four times as long as the base, and is divided into 45 articu- 

 lations, each tipped with a few minute setae. There is nothing 

 of the vermiform appearance which Sars describes and figures as 

 characterizing the antennae of the young male of C. australis 

 examined by him. 



The mandihles (fig. 6) are extremely brittle, and hence are 

 difl&cult to dissect without breaking. The right mandible has its 

 anterior or cutting-branch ending in a single strongly indurated 

 tooth, behind which, on the inner margin, is a comb-like row of 

 curved setose spines. The left mandible has the same branch 

 ending in two strong teeth or projections, of which the outer 

 and larger is itself formed of four blunt teeth. In each mandible 

 the molar tubercle stands nearly at a right angle to the cutting- 

 branch. 



20* 



