PIl YLLOBRAXCII lATE CRUSTACEA-MACRUKA. 439 



The second autemuB have the pedimcle only slightly exceeding that of the first pair. 

 The basal joint is produced into a short triangular lobe on the lower inarijin ; tiie 

 scaphocerite reaches nearly to the end of the peduncle, and its outer spine is short. The 

 flagella arc thick and tapering, and though I have not been able to observe the 

 movement, I am inclined to think they help the animal to spring. 



The third maxillipeds are slender, and do not reach to the extremity of the peduncle of 

 the first antennfe. 



The first pereiopoda are not very strongly developed and are .subcqual in form ; the 

 triangular carpos is produced on its lower side into a rounded lobe ; the propodos is 

 about as long as the rest of the limb and slightly curved at its extremity ; the dactylos 

 is short and curved, and, as well as the opposed pollex, is somewhat hairy at the tii). 



The second pereiopoda are normally long and slender ; the carpos is 5-jointed, the 

 three middle joints Ijeing together equal to the first and last in length. 



The succeeding pereiopoda are very strong and stout, and are used for walking over 

 tlie rocks and among the T^ced in T\-hich this species is found; the tiiird pair are 

 the strongest. 



The f>leopoda have short, broad, foliaceous branches, except the first pair, which have 

 one of the branches long and slender, and the other rudimentary. 



The last pair, forming the tail-fan, are nearly twice as long as thetelsou, and the plates 

 are broad and spreading ; the outer is divided by a distinct diaeresis into two nearly equal 

 parts, the upper margin ending in a strong spine ; the inner is ovate in form, and ends 

 in two sti'oug spines. 



The integument is somewhat rough vrhh harsh points, especially on the limbs, and 

 these are rather hard and brittle, as is so often tlie case with shore species. 



The colour appears to be dependent on the surroundings. The specimens from Stewart 

 Island, taken under stones, were of a uniform brownish-red colour; those from Moeraki, 

 caught on the seaweed, were olive-green. 



The normal mode of progression appears to be by walking, but when disturbed the 

 animal escapes by vigorous leaps of a foot or more in length. 



The following are the dimensions of a large male 



niiu. 



Entire Icnjjth .'JO 



Length of carapace 10 



,, telsou ;} 



Deptli of carapace 5-3 



Length of 1st pereiopod 10 



„ 1st antennse to end of flagelhun 11 



Habitat. This species occurs most commonly under stones or among Aveed between 

 tide-marks, less rarely in rock-pools. It is probably common on the coast. I have it 

 from the Bay of Islands (where Dana's original specimens were collected), "Waiwera, Capsi 

 Campbell, Moeraki, Dunedin Harliour, Stewart Island, and Chatham Islands (U. B. Kirlc). 

 rilhol records it from Cook Strait. 



I) ist I'll lit ion. Confined to Xew Zealand. 



