REPORT ON THE ISOPODA. 117 



consist of several closely approximated conical tooth-like processes ; just below this is a 

 lobe which bears at its extremity a tuft of strong though rather slender spines which are 

 in every case bifid at their extremity ; the molar process projects downwards nearly at 

 right angles with the rest of the appendage ; it terminates in a blunt cutting edge which 

 is finely grooved on one side. 



The palp arises just above the point at which the molar process joins the body of the 

 appendage ; it is three-jointed, the middle joint being the longest ; the terminal joint is 

 crescentic in outline ; from the straight lower margin are given off a series of hairs which are 

 shorter towards the articulation of the joint ; the hairs at the apex of the joint are very 

 long ; the second joint is fringed with a row of moderately long hairs for the distal one-third. 



The first pair of maxillae (PL XV. fig. 7) have, as appears to be invariably the case in 

 the Isopoda, two well-developed masticatory lobes, of which the anterior is considerably the 

 larger ; the extremity of this is fringed with a row of stiff stout hairs, above which is a 

 long, soft, spine-like process which may serve the function of a tasting organ ; above this 

 again and fringing the upper margin of the joint are a few short slender hairs ; the lower 

 lobe is oval in form, the distal margin being fringed with a few stiff hairs ; the palp of 

 this appendage is, as in other Apseudidae, well developed and three-jointed ; the proximal 

 and distal joints are subequal and much longer than the very short median joint ; three 

 or four long, slender, simple hairs spring from the apex of the terminal joint. 



The second pair of maxillae (fig. 8) are faintly divided at their extremity into 

 three lobes, of which the upper is again subdivided into two ; this lobe lies on a different 

 plane from the others ; on the outer margin are two long hairs ; the masticatory edge is 

 furnished with similar but shorter hairs ; the middle ]obe is fringed with stout spines 

 similar to those upon the masticatory edge of the mandible. The third and lowest lobe, 

 which does not project nearly so far forwards as the others, is fringed with a dense array 

 of stout, simple, straight spines, between which are a number of short slender hairs. 



The maxillipedes (fig. 9) do not present any features of particular interest. The 

 palp is long and four-jointed, the second joint being very considerably the largest. As 

 in other Apseudidse this appendage has an exopodite, which, however, I am not able to 

 figure, as it was destroyed in teasing out the mouth appendages ; its distal joint is oval 

 and fringed with fine hairs ; the second joint is stout but smooth. I presume that there 

 is a third basal joint, but I am not able to describe it. 



The chelipedes (fig. 10) are rather remarkable in form, and appear to be similar in 

 both sexes ; I could not, at any rate, detect any marked difference in the form of these 

 organs in eight individuals, which probably include representatives of both sexes. 



The chelipedes, and also the following pair of appendages, viz., the fossorial limbs, 

 are furnished with a minute three-jointed setose exopodite. The hand of the chelipedes 

 is extremely elongated and slender, and the other joints share in this slenderness, which 

 gives these appendages a very unusual form, inasmuch as they are generally extremely 



