158 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
Dimensions of the largest (male) specimen :— 
millim. 
Length of the cephalothorax (distance from its pos- 
terior margin to the anterior margin of the buccal 
CAVItY) a2ks see weet tdetas ee eee 283 
Breadth of the cephalothorax (distance between the 
second antero-lateral teeth) ...........+.... 374 
Breadth of the anterior margin of the front...... 8 
ihenipthsot the chelipedes,” :2:)..26)..5 ee eee 90 
Length of the hands (distance between the proxi- 
mal extremity of the under margin of the palm 
and the tips of the fingers)... sa sya oe eR 
Length of the upper margin of ihe ee wat eee es 27 
Length of the ambulatory legs of the penultimate 
SUE cre ont agulte SON Rite iutedlar yeas eee 90 
The habitat of this rare and interesting species was hitherto 
unknown. 
87. Meraprrax pistinctus, H. M-EHdw. (PI. X. figs. 7-9.) 
Metaplax distinctus, H. Milne-Edwards, Observations sur la classifi- 
cation des Crustacés, Ann. Sct. Nat. 1852, p. 162, pl. iv. fig. 27. 
Two fine male specimens were collected at Sullivan Island. 
The collection of typical specimens of the Paris Museum, 
kindly sent to me by Prof. A. Milne-Edwards, included two 
small, little-known forms, viz. Metaplax indicus and M. dis- 
tinctus ; unfortunately the type specimen of the latter had lost 
its chelipedes, but this species is very well characterized by the 
structure of its infraorbital ridge. 
M. distinctus and the three following species of the present 
report differ at first sight from I. crenulatus by their smaller size, 
their more enlarged cephalothoraces, not narrowed anteriorly, by 
their less elongate legs, and by the ambulatory ones being spinu- 
lose only along the upper margin of their meropodites. 
For the general appearance of the cephalothorax, I refer to 
the figure in the ‘Annales des Sciences Naturelles,’ which is 
exact. The upper surface is sparsely punctate, and the lateral 
margins are armed with four teeth (the external orbital angles 
included); these teeth are formed by three incisions, the an- 
terior of which is rather deep, whereas the posterior two are 
much smaller. The first two teeth have almost the same 
size, and are much larger than the posterior two, the last being 
