PODOPHTHALMOUS CRUSTACEA. 65 



wise shaped antero-lateral margins and by the spines of 

 the meropodal joints. 



It may be allowed to add that the Museum is also in 

 the possession of a Paratelphusa from the island of Banka, 

 which resembles almost completely the true Paratelph. 

 tridentata M. Edw., but the carapace is a little more convex 

 and the meropodal joints have only rudimentary spines. 

 Perhaps this variety may be pecuHar to that island. 



12. Limnocarcinus intermedius n. gen. n. sp. 



Limnocarcinus ^): New genus of the family of Gecarci- 

 nidae, and more particularly of the subfamily of the 

 Gecarcininae Wood-Mason. Front not united to the internal 

 suborbital lobes , quite as is the case in Hylaeocarcinus 

 Wood-Mason ; the flagella of the antennae projecting into 

 the interspaces between the front and the internal subor- 

 bital lobes. The third joint of the external maxilhpeds 

 with an obtuse-angled emargination in its anterior border; 

 the three terminal joints however fully visible exter- 

 nally when the manillipeds are properly closed, the manil- 

 lipeds having quite the same shape and form as in Pelo- 

 carcinus Lalandei M. Edw. 



Limnocarcinus evidently presents a remarkable transition 

 from Pelocarcinus M. Edw. to Hylaeocarcinus Wood-Mason, 

 quite as the latter genus is intermediate between Pelocar- 

 cinus and Gecarcinus. 



The species which we will call Limnocarcinus interme- 

 dius , is most closely allied to Hylaeocarcinus Humei Wood- 

 Mason of the Nicobar-Islands , and bears a striking 

 resemblance to it, so that it may suffice to describe only 

 the differences and to state the measures. 



Firstly the tubercles on the mesogastric lobe are scarcely 

 perceptible in our species , which are very distinct in Hyl. 

 Humei. Then the fissures separating the two suborbital 



1) From ^I'l^vti, a moor and KxpKivo^, crab. 



Notes from the Leyden IMuseum. 



