,4:6 MR. H. R. HOGG ON SOME 



ou both joints. The palpi are orange, with dai'k blotclies on tlie 

 t'eniur and inside of tibia. Tlie legs are dingy yellow, ringed with 

 brown. On the under side the whole of the cephalic part is 

 orange, and the segments black-brown. In the female the pale 

 area of the carapace is paler and more cream-colour th.an in the 

 male, and the femur and patella of the palp are more continuously 

 black-brown, otherwise the coloration is much the same. 



The carapace in both sexes is of a dull smoothness without 

 granulations, and the only spinous tubercles are one at each 

 front corner at the side of the trochanter of the first leg. The 

 spots on the segments are slightly raised, with a bristle on each. 



The eye-tubercle is clearly removed from the front mai'gin, and 

 the portion between the eyes is produced forward into a peak 

 about as high as the portion of the tubercle below the eyes. 



The mandibles are remarkably short, but the first joint bulges 

 upwards above the base. On the other hand, tlie palpi are 

 nearly twice as long as the whole body, the femoral joint bowed 

 like the first joint of the mandible, and pow^erfully bespined both 

 above and below. The other joints are similarly spined. 



The tarsal joint of legs iii. and iv. in the male has the modifi- 

 cation of the claws which Mr. Pocock considered one of the 

 points of his genus Sorensenella — viz., the side claws longer than 

 the median ; but in the female the claws are normal, the side 

 claws being only half the length of the median, but springing 

 from the base, thus showing that this character is only sexual in 

 some cases. 



The sternum in the male is of the narrow type, triangular at 

 the base and spear-headed at the distnl end, with the oral part 

 of coxa3 ii. meeting above it and no visible lip ; but in the female 

 it is broad, as I have above described it in Tricenovyx varieyata, 

 with a well-defined lip in front. It would appear, therefore, as 

 if this broad sternum, where it occurs, is a sexual cliaracter. I 

 have re-examined the specimens I believe rightly taken to be 

 males of T. variegata (indeed, in one of them the penis is exposed ) ; 

 and, although the sternal depression is still wide, a slightly- 

 formed narrow sternum is to be seen in the median line, and the 

 lip is above it. 



The measurements (in millimeti'es) are as follows : — 



Male. Oeph. Ig. 2^, lat. 3| ; abd. Ig. 2f , lat. 4; mand. 2; palpus ; 

 1st leg 8i, 2nd 14i,' 3rd 9, 4th 13. 



Mr. W. Traill, after whom I have named them, sent the 

 specimens, one male and one female, from Stewart Island. 



Algidia, gen. nov. 



This genus differs from the others in the family in having the 

 genital operculum, in both sexes, furnished with denticular 

 tubercles, each with a short bristle at its apex, extending along 

 the front margin and to a greater or shorter distance down the 



