CBTJSTACEA OP THE MERGITI AECHIPELAGO. 103 



with those of T. Callianira, and the under margin of the lower 

 finger is minutely granular near the tip. 



The ambulatory legs are unfortunately wanting, except the left 

 leg of the last pair ; this leg closely resembles bhe corresponding 

 leg of T. Callianira, but the propodite is comparatively a little 

 shorter and broader. The dactylopodite is flattened and not 

 grooved or ridged. 

 Dimensions •• — 



millim. 



Length of the cephalothorax lOf 



Distance between the epibranehial teeth 13^ 



Distance between the external orbital angles. . . . II5 

 Length of the larger hand (fingers included) .... 10| 



Height of the hand 5| 



Breadth of the front 6^ 



Genus Pinnotheres, Latr. 



Q5. PiNNOTHEEES Edwaedsi, n. sp. (PL VI. figs. 6-9.) 



The collection contains one adult female specimen of a Pinno- 

 theres, provided with eggs, which was found in an Osfrea at King 

 Island Bay. 



I regard this species as new. So far as I know, eight species 

 of the genus Pinnotheres, besides the European P. pisiim (which, 

 according to Heller, occurs also in New Zealand), have been 

 described as inhabiting the shells of MoUusca in the Indian Ocean, 



Although the specimen before me agrees in many of its 

 characters with the European P. pistim, it appears to be distin- 

 guished from it by the shape of its external maxillipeds and by 

 the short down with which the whole animal is nearly covered. 



It closely resembles P. pisum in the shape of its cephalothorax, 

 but the front is a little more prominent and the carapace is 

 somewhat more laterally dilated, the antero-lateral portion of the 

 lateral margin making a blunt angle with the postero-lateral 

 portion. The upper surface is a little convex, and the grooves 

 or depressions by which the gastric, cardiac, and intestinal regions 

 are separated from the lateral regions of the upper surface are 

 rather deep, whereas in P. pisum these impressions are quite 

 indistinct. 



The whole upper and under surfaces of the cephalothorax, the 

 external maxillipeds and the abdomen included, appear to have 



