ISOPODA. 67 



The mandible is stout, the cutting edge is prominent, expanding to its 

 distal extremity which bears a very small tooth both anteriorly and posteriorly, 

 the intermediate margin being minutely toothed. The molar process is stout, 

 curved and tapering, it ends in two or three stout teeth and four slender spines 

 below these. 



The palp was not observed. 



The first maxilla consists of the normal two lobes, the inner and smaller carries 

 distally two large and one small seta, which are slightly plumose, the outer lobe is 

 armed with stout spines. 



The second maxilla. The principal lobe is nearly as broad as the other two 

 together and is armed with stout pectinate spines, the innermost ones being the 

 shortest and strongest. The other lobes are subequal in size, and each bears two long 

 pectinate spines, which are much more delicate than those on the inner lobe. 



The maxillipeds are of quite normal proportions ; the distal margin of the 

 masticatory lobe is armed with three or four denticulate spines. There are two 

 papilliform teeth on the inner margin, these are rounded knobs with short stalks. 

 The palp is five-jointed, the first three are broad and progressively increase in length, 

 the remaining two become more finger-like. 



The pereiopoda are, except the first, uniform in structure, slender and not 

 inordinately long, as far as can be seen without removing a limb. The first pereiopod 

 is rather short and much stouter than the others, obviously prehensile in function. 

 The basis is stout and of moderate length, the ischium rather more than half as long. 

 The merus and carpus are both very short and stout, the latter is much dilated, with 

 two stout spines vent-rally. The propodus is slightly curved and about as long as the 

 two preceding joints. The dactylus is well developed, with a spine or accessory claw 

 at the base of the nail and two curved setae upon it. 



Of the others the basis is rather long, the ischium much shorter. The merus is 

 short and enlarged dorsally ; the carpus is quite twice as long ; the propodus a little 

 longer and much more slender than the carpus ; the dactylus is well developed, 

 proportionally one-third the length of the propodus, and a " nail " is distinct with a 

 small spine or spiuous seta at its base. 



The first pair of pleopoda which forms an operculum over the remainder consists 

 of a comparatively narrow band which at about two-thirds of its length widens out 

 considerably and then tapers to a blunt point. The lateral projection bears three small 

 setae, and the angular apex is due to the folding of the lateral margins inwards and 

 downwards. 



Four specimens were taken in Winter Quarters during February and March, 1902, 

 before the ship froze in. Inside the 20-fathom line. 



Q 2 



