CRUSTACEA OF THE MERGUI ARCHIPELAGO. 233 
having compared it with the typical specimen of Pagurus 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, Fabr. | 
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, Fabr., 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 
antenne 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 
