CRTJSTAC"EA OF THE MERGITI AECHIPELAGO. 233 



having compared it with the typical specimen of Fagurus miles, 

 Fabr., which was sent to me by Prof. Mobius, of Kiel University. 

 The type unfortunately is in an extremely bad state, being broken 

 into many pieces, and some of the fragments, such as the hands 

 of the anterior legs, are missing. The type specimen is much 

 larger than the Mergui individual, the cephalothorax, including 

 the rostrum, being about 32 millim. long. The latter, however, 

 almost completely agrees with the fragments of the type. In the 

 structure of its cephalothorax, rostrum, ophthalmic scales, and 

 antennal peduncles, the Mergui specimen completely agrees with 

 the type of D. miles. The legs of the two specimens, so far as I 

 can judge from the fragments of them remaining in the type, 

 show striking resemblances, but the dactylopodites of the second 

 and third pairs in the typical specimen are armed above only with 

 one row of acute spinules, whereas in the Mergui specimen two 

 parallel rows are present. Although I am inclined to ascribe 

 this slight difference to the larger size of the typical specimen, I 

 must acknowledge, however, that the identification is inconclusive, 

 as the hands of the typical specimen are not available for 

 comparison, and that further researches are necessary to decide 

 whether I am right in considering the Mergui Crab to be a 

 young individual of Pagurus miles, Eabr. 



As has already been observed by Mr. Miers, P. miles, Herbst, 

 is a distinct species from P. miles, Fabr., differing from it by the 

 larger hand having a smooth outer surface, and by the existence 

 of a strong blunt lobe or tubercle on the inner margin of the 

 wrist. D. miles of Milne-Edwards, Dana, and Haswell is a third 

 species, which I have described above as new, under the name of 

 D. merguiensis. I will first point out some characters by which 

 it will be possible to distinguish this species, as here understood, 

 from D. merguiensis. 



The rostrum of D. miles, Pabr., is comparatively much longer 

 than that of D. merguiensis, being almost twice as long as the 

 inner margin of the ophthalmic scales ; it is strongly spinulose 

 at its distal half and armed on each side with three or four 

 spinules. The spines in which the basal scale on the upper sur- 

 face of the penultimate joint of the peduncle of the external 

 antennae terminates are comparatively shorter in D, miles, the 

 internal spine reaching scarcely to the middle of the joint, 

 whereas in D. merguiensis the internal spine projects even 

 slightly beyond its distal end. The legs of D. miles are less 



