Chilton. — On New Zealand Freshxvater Crayfisli. 243 



(1.) On the portion of the carapace in front of the cervical 



groove : ^ 



Group A, containing the two spines at base of the 



rostrum on each side. 

 Group B, two spines behind the eyes and below 



A. 

 Group C, thi'ee or four spines on anterior margin of 



the carapace, near the bases of the antennge. 

 Group D, two or more spines on the part of the 



carapace posterior to C, and in front of the cer- 

 vical groove. 

 Group E, one or two spines below D, and usually ou 



a slight projection of the carapace. 



(2.) On the portion of the carapace behind the cervical 

 groove : 



Group F, two spines immediately behind the cer- 

 vical groove, and between it and the branchio- 

 cardiac grooves, which here extend forwards and 

 outwards towards the cervical groove. 



Group G, four spines close behind the vertical 

 portion of cervical groove below and in front 

 of F. 



Group H, six or seven spines along the cervical 

 groove where it curves horizontally, forwards 

 (below group E). 



Group J, includes the spines and tubercles on the 

 branchiostegites, excluding those bordering the 

 cervical groove and already enumerated. About 

 six of the more anterior are distinctly spinous, 

 the others gradually degenerate posteriorly into 

 mere tubercles. 



The peduncles of the antennae and antennules both reach 

 about to the end of the rostrum ; that of the antenna bears 

 several spines on the under surface of the different joints. 

 The squame of the antenna is large, and reaches rather be- 

 yond the end of the rostrum ; it is triangular, narrowing an- 

 teriorly, and at the end narrowing abruptly to a sharp point ; the 

 inner edge is fringed with long setaB, and there is a deep longi- 

 tudinal groove above. The anterior part of the epistoma, between 

 the bases of the antennules, is broad, triangular, and flat, end- 

 ing anteriorly in a sharp spine. The great claws are large and 

 long, being about six-sevenths the length of the body. The 

 propodos is not compressed, and its length (excluding the fixed 

 finger) is about twice as great as that of the carpus, and about 

 three times its own width; it widens slightly towards the distal 

 16 



