Critstacca. 235 



propodos and dactylus. TIiu cliula of the second appendage is similar 

 but smaller, and the entire limb is much more delicate and, l)y a 

 good deal, the longest of the series. The carpus is divided into 

 fourteen more or less distinct joints, and of these the most distal is 

 ,as long as any other two. Of the remaining appendages, the next or 

 third is the longest. It is stoutly built, and the carpus and meros 

 respectively, bear one and two distal spines. The inner margin of 

 the propodos and dactylus bear smaller spines along their entire 

 length, and the latter terminates in two claws. The fourth and 

 fifth are similar, but the propos in the latter bears a conspicuous 

 tuft of setae at the distal extremity. 



In the specimen most closely examined it was found that the 

 second and fourth appendages were obviously replacements due to 

 injury, as they were very much less than normal size. 



Tlie pleopods consist of a stout peduncle and a lanceolate exo- 

 and endopodite, the pair forming the caudal fan being large and 

 ovoid. The exopodite is scarcely as long as the endopodite, but is 

 obscurely divided near the extremity ; this division is marked by 

 the presence of a stout spine on the outer border. Another stout 

 spine exists at the proximal end, but this belongs to the peduncle. 



The telson is long and gently tapering, rounded at the extremity, 

 which bears five spines among the setae. The middle one of these is 

 small, the adjacent pair are very long and the outer of moderate 

 size. The dorsal surface bears two pair of lateral spines and a few 

 stout setae near its junction with the body. 



Tliis species is a very close ally of Hi'p'polyte magellanicus of 

 Milne Edwards (22, p. F. 46), but the specific descriptions afforded 

 by that work are by no means satisfactory. Four specimens of this 

 species were taken at Auckland Island in ten fathoms. The speci- 

 mens varied in size from thirty-eight to twelve millimetres, 

 measured from rostrum to telson. The species also appears subject to 

 some variation as regards the rostrum ; the specimen examined had 

 f teeth, two of the others |, and in one of these a lower tooth was 

 very small, and the fourth specimen had | teeth. 



A large member of the Palaemonidae was taken from the stomach 

 of a seal on Duke of York Island, but it is in such a mangled 

 condition that no satisfactory description can be made. 



