158 DE. J. G. BE MAJSr ON THE PODOPHTHALMOTJS 



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) 28| 



Breadth of the cephalothorax (distance between the 



second antero-lateral teeth) 37^ 



Breadth of the anterior margin of the front 8 



Length of the chelipedes 90 



Length of the hands (distance between the proxi- 

 mal extremity of the under margin of the palm 



and the tips of the fingers) 42 



Length of the upper margin of the palm 27 



Length of the ambulatory legs of the penultimate 

 pair 90 



The habitat of this rare and interesting species was hitherto 

 unknown. 



87. Metaplax distincttjs, H. M.-Udw. (PI. X. figs, 7-9.) 



Metaplax distinctus, S. Milne-Edwards, Observations sur la classifi- 

 cation des Crustaces, Ann. Sci. Nat. 1852, p. 162, pi. 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 M. 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 



