172 PALAEMON ORNATUS. 



lected by Mrs. Pollen and van Dam in the island of Reu- 

 nion , which belong positively to the species , called Palae- 

 mon ornatiis Oliv: these specimens however have been 

 described and figured by Mr. Hoffmann (1. c.) under the 

 new name of Palaemon longimatms Hoffm.: it is hoivever quite 

 impossible for me to find any specific difference between these 



specimens and the typical examples of Pal. ornatus Oliv. 



7 9 



from the Moluccas. Thus the rostrum , being - — - dentate , 



is in most specimens rather shorter than the peduncle of 

 the internal antennae, in some individuals however it 

 reaches to the end of this peduncle , and it agrees closely 

 in its form with the rostrum of Pal. ornatus Oliv. The 

 specimens present also a complete resemblance in all other 

 regards with the Indian species. Hoffmann has given the 

 measures of the largest male specimen , and the figures of 

 its second pair of legs : the largest female specimen that has 

 a length of 105 mm., has the second pair of legs equal in size , 

 being 75 mm. long, th^ arm measuring 15 mm., the wrist 

 13 mm., the palm 16 mm., and the fingers 14 mm.; in 

 a very young female specimen 63 mm. long, the second 

 pair of legs are also equal in size, measuring 35 mm., 

 while the arm has a length of 7^/2 mm., carpopodite of 

 6'/v mm., palm of 7 ram. and fingers of 6 mm. 



Palaemon ornatus Oliv. accordingly has a wide geogra- 

 phical range , being found in Tahiti (Fleller) , New-Zealand 

 (Heller) , New-Guinea (Andaï , von Rosenberg) , Halma- 

 hera , Morotaï , Amboina , Celebes , Ternate , Flores , Ado- 

 nare , Waigeoei (Milne Edwards) , Xulla-Bessy , Gebeh , the 

 Philippines (von Martens) and also at the island of Reu- 

 nion , a very wide range for a fresh-water form. As we 

 have seen , this species however presents some varieties , 

 individual and local , not only as regards the relative length 

 of the rostrum with respect to the peduncle of the inter- 

 nal antennae , or the antennal scale and the number of 



JSotem from, the Ley den IMueseum. 



