214 DB. J G. DE MAN ON THE PODOPHTHALMOUS 



The anterior margins of the meropodites of the ambulatory 

 legs are unarmed, but the posterior margins of the first two pairs 

 are armed with an acute spine near their distal ends. In one 

 large individual the latter margins are armed with two spines 

 at the distal end, as a second smaller spinule occurs between 

 the described one and the articulation. The posterior margins 

 of the meropodites of the third pair of ambulatory legs (the 

 penultimate pair of legs) are unarmed. The propodites of 

 the first three pairs of ambulatory legs are armed with a small 

 spinule in the middle, and with one somewhat larger and with 

 two similar small spinules at the distal ends of their posterior 

 margin; these spinules are all mobile. The dactylopodites of 

 the first three pairs of ambulatory legs are short, terminate in 

 a black horny claw, and are armed on their posterior or inner 

 margins with two ot three spinules. The ambulatory legs are 

 somewhat hairy. 



The specimens are of a yellowish-red colour, and marked with 

 numerous small red spots on the carapace and on the ambulatory 

 legs, and with some larger red spots on the anterior legs. 



Mr. Miers has lately pointed out (Voyage of H.M.S. ' Alert,' 

 p. 269) that the carapace of JPorcellana (Petrolisthes) LaonarcMi, 

 Leach, from Australia, is armed witb an epibranchial spine. I am 

 indebted to Prof. Milne-Edwards for a typical specimen of For- 

 cellana (Fetrolisthes) Lamar cJcii, M.-Edw. (Hist. Nat, des Crust. 

 t. ii. p. 251), from New Ireland, and having carefully examined 

 it, I am disposed to regard this form as merely a variety of 

 P. inermis, Heller, as the foregoing typical specimen differs from 

 the Mergui specimens of P. inermis only in one character, viz., 

 the presence of two small spinules on the anterior margins 

 of the meropodites of the second and third pair of ambulatory 

 legs. 



Fetrolisthes hastatus, Stimps., from Japan, seems to be iden- 

 tical with, the New Ireland species. If this and the foregoing 

 supposition prove to be true, then this species must bear the 

 name of P. hastata, Stimps. 



The cephalothorax of the largest Mergui specimen is nearly 

 12 milHm. long. 



Porcellana inermis, Heller, has hitherto been recorded only 

 from the Nicobar Islands. 



