452 PROK. C. CHILTON ON DETO, A SUBANTARCTIC 



and hard and rather difficult to cut through. On opening one I found it to 

 be loosely filled with a soft white substance of a granular nature, showing 

 no definite structure, but containing numerous globules of fat. In this 

 Paterson's Inlet specimen the tubercles on the segments of the perseon are 

 rather more developed and more acutely pointed, especially those near the 

 sides, than in the Chatham Islands specimen. 



The antennules (fig. 47) have the first joint about as long as the second 

 and third together, the third being only about half the size of the second. 



The antennse are large and strong in the male (fig. 48), but not so greatly 

 expanded as in D. aucklandice ; the whole antenna is scabrous, with minute 

 spinules, and bears also some fine setse, especially towards the distal part. 

 In the female (fig. 49) the antenna is much more slender and does not differ 

 very much from that of the female of D. aucMandia\ 



The mouth-parts are, on the whole, similar to those of D. aucklandice. In 

 the right mandible (fig. 50) the accessory appendage ends in a crown of 

 small pointed teeth of irregular size, and the hairy lappet at its base bears a 

 haired bristle similar to the '' penicil " situated between the lappet and the 

 tuft of bristles representing the molar tubercle ; this tuft contains a large 

 number of bristles varying in length, those towards the cutting-edge being 

 the shortest. The left mandible (fig. 51) has four teeth in the outer cutting- 

 edge and three in the accessory appendage, the other parts being the same 

 as in the right. The lower lip (fig. 52) and the first maxilla (fig. 53) are 

 similar to those of D. aucklandice ; in the second maxilla (fig. 54) the outer 

 lobe is much narrower than the inner one. The terminal portion of the 

 maxilliped is shown in fig. 55, and does not differ in any essential detail 

 from that of D. aucklanduc. 



The legs (fig. 56) are similar to those of I), aucklandice, though slightly 

 more slender ; they are all of about the same length, the posterior ones being 

 only slightly longer than the anterior ; in all, the inner surface of the joints, 

 especially of the ischium, merus, carpus, and propod, is thicldy covered with 

 a dense fringe of short fine setse; a few stout spinules are found on the 

 different joints, as shown in the figures. 



The pleopoda are, on the whole, similar to those of D. aucklandia;, except 

 that the exopod of the first pleopod (fig. 57) is not so much produced at its 

 inner distal angle ; the endopod is fairly stout, more than twice as long as 

 the exopod, and is channelled on the posterior surface. The male organ 

 reaches as far as the exopod. In the second pleopod (fig. 58) the terminal 

 portion of the endopod forms an extremely long styliform process, about 

 three times as long as the exopod, and a groove extends along its anterior 

 surface throughout about two-thirds of its length. 



The uropod (fig. 59) is, on the whole, similar to that of D. aucklandice, and 

 has been sufficiently described in the specific diagnosis. 



