Mr. E. J. Miers on Malaysian Crustacea. 383 



its distal end than is usual in P. carcinus, and seems to 

 approach the form of this segment in P. Rosenbergii, a species 

 recently described by Mr. de Man, and founded on a unique 

 example. Possibly a larger series would show that the latter 

 is not specifically distinct. 



Palcemon ornatus. 



Palcemon ornatus, Olivier, Encycl. Meth. Hist. Nat. viii. p. 660 (1811); 

 Latr. Encycl. Meth. Atlas, pi. cccxviii. fig. 1 : M.-Edw. Hist. Nat. 

 Crust, ii. p. 396 (1837) ; v. Martens, Arch. f. Nat. xxxiv. (i.) p. 36 

 (1868) ; Miers, Phil. Trans. Roy. Soc. clxviii. p. 493 (1879). 



Palcemon vagus, Heller, Sitzb. Ak. Wien, xlv. i. p. 417, pi. ii. figs. 42, 

 43 (1862). 



P. equidens, Heller, t. c. p. 418, pi. ii. fig. 44 (1862). 



Palcemon reunionensis, Hoffmann, Crust, in Recherches faune Mada- 

 gascar, p. 33, pi. ix. figs. 66, 67 (1874). 



Palcemon mayottensis, Hoffmann, t. c. p. 32, pi. ix. figs. 61, 62 (1874). 



Palcemon longimanus, Hoffmann, t. c. p. 34, pi. ix. figs. 68, 69 (1874). 



Celebes, Macassar (an adult male) ; Bali (an adult male) . 



The identity of P. vagus, Heller, and of P. longimanus, 

 Hoffmann, with the very common and widely-spread P. orna- 

 tus is confirmed by Mr. de Man, by whom also P. mayottensis, 

 Hoffm., is shown to be at most only a local variety of the 

 same species. On the other hand, Mr. de Man (who had Hoff- 

 mann's types before him) regards P. reunionensis (which I 

 have considered identical with P. ornatus) as synonymous 

 with P. equidens of Heller, and the latter as distinct from P. 

 ornatus. P. equidens was originally founded by Dana on an 

 example in which the second legs were wanting and which is 

 thus insufficiently known. But I can see no reason for 

 regarding P. reunionensis or P. equidens as described by 

 Heller, as distinct from P. ornatus, nor does Mr. de Man 

 mention any character by which they may be separated with 

 certainty. Both Heller's and Hoffmann's figures of the 

 second legs show that they resemble those of P. ornatus, both 

 in the proportions of the joints and characteristic tuberculation 

 of the fingers. 



Palcemon dispar. 



Palcemon dispar, v. Martens, Arch. f. Nat. xxxiv. p. 41 (1868) ; Miers, 



Phil. Trans. Roy. Soc. clxviii. p. 493 (1879). 

 Palcemon Alphonsianus, Hoffmann, Rech. faune Madagascar, Cr. p. 35, 



pi. ix. figs. 63-65 (1874). 



Samangkabaai, Tandjong (an adult male). 



In this example the rostrum (which is broken off at the 

 tip) is ™ -toothed. The smaller leg of the second pair is 

 wanting ; but I do not doubt its identity with v. Martens's 

 species. The teeth on the inner margins of the fingers are 

 largest at base, and become smaller or obsolete toward the 



26* 



