CRUSTACEA OF THE MERGUI ARCHIPELAGO. 255 
Length of the last four joints of the second and third legs :— 
Right leg Rightleg Left leg Left leg 
of the of the of the of the 
2nd pair. drdpair. 2nd pair. 3rd pair. 
mm. mm. mm. mm. 
Meropodites*...... z ; 63 61 
Carpopodites ...... 44 43 4 4d 
Enopodites ...'..... 7 = 52 64 
Dactylopodites .... 7 1Z 67 a 
As these dimensions show, the right legs are longer than 
the left; the right lee of the third pair is the longest of all, 
and the left leg of the second pair the shortest. The propo- 
dites of the two right legs have nearly the same length, those 
of the two left legs are unequal, the propodite of the left leg of 
the third pair being a little longer and stronger. Except in the 
right leg of the second pair, the dactylopodites are slightly 
longer than the propodites ; the dactylopodite of the right leg of 
the third pair is the longest, the dactylopodite of the left leg 
of the second pair the shortest of all; and the dactylopodites of 
the right leg of the second pair and of the left leg of the third 
pair are almost of the same length. 
Genus Cenosira, Latr. 
142. CENOBITA VIOLASCENS, Heller. 
Cenobita violascens, Heller, Crustaceen der Novara- Reise, p. 82, Taf. vi. 
fig. I. 
Four specimens were collected. One, inhabiting the shell of a 
Turbo, is adult, and was found in King Island Bay; the other 
three, one of which is ina shell of Eburna, are from Sullivan 
Island. 
According to Mr. Miers (‘Annals and Magazine of Natural 
History ’ for May 1880, p. 32), this species is probably identical 
with Cenobita compressa, M.-Kdw. I believe he is right. 
Cenobita violascens was discovered in the Nicobar Islands by 
the ‘Novara’ Expedition. 
* These joints were measured along their upper margins; all the dactylo- 
podites, when seen from above, seem to be shorter than the propodites, because 
their tips are downwardly curved; but the real length of their upper margins, 
the tips included, are given in this Table ; and this length, as a matter of fact, 
exceeds, in some dactylopodites, the length of the upper margin of the cor- 
responding propodites. 
