Chilion. — Notes on the Callianassidae of N.Z. 463 



that this species comes very close to C. ceramica of Victoria, 

 Australia. It appears to differ in the possession of a small spine 

 on the ocular peduncles, in the greater development of the 

 crest-like expansions of the greater chelipeds, and perhaps also 

 in the proportions of the abdomen and of the telson and branches 

 of the uropods, and in other minor details. None of these differ- 

 ences are of very much importance, and some of them may be 

 due to differences in age and sex. Mr. Stebbing has described 

 two species, C. kraussi and C. rotundicaudata, from South Africa, 

 but both of them appear to differ considerably from the Austra- 

 lian and New Zealand species. A. Milne-Edwards describes the 

 chelipeds of C. filholi as being almost equal in the specimens he 

 examined, but in all the specimens I have seen one is much 

 larger and broader than the other. The figures of the chelipeds 

 given by Filhol do not appear to be particularly accurate. 



In the few works at my disposal I have been unable to find 

 much information about the pleopods, more particularly as 

 regards the 1st and 2nd and their modification in the two sexes. 

 Mr. Stebbing briefly described these appendages in C. kraussi, 

 but does not figure them nor mention which sex he is describing ; 

 in C. rotundicaudata there is, he says, no trace of pleopods on the 

 first two segments of the pleon. 



In most of the specimens of C. filholi that I have seen there 

 is no appendage on the 2nd segment of the pleon, and only a 

 small one on the 1st : this is only 4 mm. long, and consists of a 

 slender basal joint followed by a second joint of about the same 

 length, but stouter, and bearing two or three simple setae. (See 

 Plate XVI, fig. 3.) In one specimen both 1st and 2ud pleopoda 

 are present, and they are much better developed. In the 

 1st (fig. 4) the basal joint is long and bent into a curved 

 or boomerang shape ; it bears a dense tuft of long setse, 

 most of which are plumose, at the bend of the joint, and 

 tufts of similar setse at the distal end. Some of these setae 

 are irregular towards the end and appear covered with some 

 mucilaginous substance ; the basal joint bears only a single 

 branch, of which the 1st joint is a little longer than the 2nd ; 

 both bear numerous long setae, most of which are plumose. The 

 2nd pleopods (fig. 5) are large and biramous, the basal joint is 

 stouter than in the 1st pleopod but similarly bent and supplied 

 with setae ; the outer branch is composed of two joints, the 1st of 

 which is about half as long again as the 2nd ; the inner branch 

 is rather longer than the outer and consists of two subequal 

 slender joints. Dense tufts of plumose setae are found at the 

 bend and distal end of the basal joint, and at the distal end of 

 the 1st joint of the outer branch ; the other parts bear nume- 

 rous long simple setae as shown in the figure. 



