62 PODOPHTHALMOUS CRUSTACEA. 



A close examination has led me to the conclusion that the 

 first three enumerated Paratelphusae belong altogether to the 

 same species , to the Paratelphusa ^Wc?ewtoto M. Ed w. , which 

 name has the priority , though the names , given by de 

 Haan , are of older date , 1". because it appears that three 

 different names have been applied by de Haan to three 

 specimens of the same species , tohich fact is quite inexplicable, 

 and 2°. because these species have never been described by 

 our eminent carcinologist. The fourth specimen , on the 

 contrary , to which de Haan has given the name of Tel- 

 pliusa convexa , belongs really to a new species , which I am 

 now going to describe. I intend, moreover, to describe a second 

 new species from Sumatra, that has been collected by Mr. Snel- 

 leman during the recent expedition to the interior of this island. 



The Paratelphusa tridentata M. Edw. may be characte- 

 rized in this manner: 



Antero-lateral margins of the somewhat depressed carapace 

 with two epibranchial teeth , the posterior of which is 

 directed straightly backwards and passes not inwards on 

 to the carapace. The post-frontal crest ends nearly 

 at the middle of the anterior epibranchial tooth. An 

 imaginary line , uniting the posterior epibranchial teeth , 

 is situated much nearer to the post-frontal crest than 

 to the transverse furrow on the middle of the carapace. 



The suborbital margin having a regularly arched course 

 without an obtuse angle. The meropodal joints of all the 

 legs without a sharp spine at the distal end. 



This species may therefore at once be distinguished from 

 the Paratelphusa maculata mihi and from the Paratelphusa 

 convexa de Haan by the want of the sharp spines at the 

 distal end of the meropodites. It differs more especially 

 from Paratelphusa convexa de Haan by quite a different 

 facies, by its depressed carapace, comparatively shorter antero- 

 lateral margins , by its more slender legs etc. ; and it dif- 

 fers from the Paratelphusa maculata mihi moreover by 

 its shorter and otherwise shaped antero-lateral margins 

 and by the course of the post-frontal crest. 



Notes from the Leyden Miuseuixi. 



