44 DE. W. T. CALMAN ON A COLLECTION OF 



margin of the ischium, and is less than half the width of the latter, hardly wider than the 

 succeeding joints, and hut little flattened. The exoj)od is rudimentary, heing a simple 

 lobe about half the length of the ischium. The epipod is well-developed. The second 

 maxillipeds have the basal part of the exopod much expanded. In the first maxillipeds, 

 also, the same part is very stout and much stronger than is usual in this appendage, 

 while the inner lobe or endopod is small and subtriangular. The chclipeds are rather 

 stout, about twice the diameter of the succeeding legs, and smooth save for scattered 

 setae similar to those on the carapace. The merus has a small spine near the distal end 

 of the inner margin. The hand is not much thicker than the preceding joints. Tiie 

 palm is less than twice as long as broad, nearly twice as long as the fingers. Thedactylus 

 has a single tubercle on its inner edge. Tiie walking-legs are not at all concealed by 

 the carapace. The first three pairs are about equal in length to the chelipeds and the 

 last pair is a little shorter. The dactyli are strong and curved, and bear a low tooth on 

 the inner edge near the tip. Tlie legs bear scattered set^e, which are larger and more 

 numerous than are those on the body. The abdominal appendages are reduced to three 

 pairs, corresponding to the second, third, and fourth abdominal somites. They are 

 uniramous with the exception of the first, which carries on the outer side near the base 

 a small unjointed aj)peudage which appears to represent the exopod. 



The female generative aj)erturesare ci-escentic in form, and are situated on the sternum, 

 far apart from each other, close to the bases of the third legs. 



The dimensions of our two sjjecimens are as follows : — 



Stimpson's brief description applies very well, on the whole, to the specimens examined 

 by me. The most serious discrepancy is that the exopod of the third maxillipeds is 

 described as '' slender and palpigerous." It seems quite possible, however, that in 

 examining the entire animal the rudimentary exopod of this appendage may have been 

 overlooked, and the more conspicuous exopod of the second maxilliped may have 

 appeared to belong to the third. The antennules are stated to be " very short and 

 minute," but as they are said to be " jjlaced at the inner angle of the orbit," it seems not 

 unlikely that these epithets should be transferred to the antennae, to which they are more 

 applicable. Some other less important differences, such as the description of the front 

 as " straight," may reasonably be attributed to imperfect observation. On the other 

 hand, tlie description of the general shape, the large abdomen, the large buccal area 

 occupying nearly the whole breadth of the carapace, the third maxillipeds with " the 

 ischium large and dilated within, while the merus is very small and slender like the last 

 three joints," and several other details can apply to no other crustacean, and leave no 

 doubt that we are dealing with Stimpson's species. 



