TO INDIAN CAKCINOLOGY. 433 



characters vary. De Man has more recently described a variety amboinensis in which 

 the lower carpal spine is wanting. 



Distribution. N. Australia (3Hers) ; Amboina (De Man) ; Singapore ( Walker) ; 

 Mergui (I)e Man). 



Group Astacidea. 

 Genus Thenus, Leach. 



244. Thenus orientalis (Fabr.). 



T. orientalis (Fabr.), Milne-Edwards, Hist. Nat. Crust, t. ii. p. 286 (1837). 



Common at Madras and on the South Indian coast generally (J. JR. H.). 



The three teeth in the mid-dorsal line of the carapace are prominent and subacute in 

 young individuals, blunt and ill-defined in adults. 



Distribution. Madagascar, Seychelles, Indian Seas, Malay Archipelago, China, W. 

 Australia. 



Genus Panulirus, Gray. 



245. Panulirus ornatus (Fabr.). 



Palinurus ornatus (Fabr.), Milne-Edwards, Hist. Nat. Crust, t. ii. p. 296 (1837). 

 Panulirus ornatus (Fabr.), Stinipson, Proc. Acad. Nat. Sci. Philad. Jan. 1860, p. 24. 

 Senex ornatus (Fabr.), Ortmann, Zool. Jabrb. Bd. vi. Abth. f. Syst. p. 34 (1892), ubi synon. 



Ceylon (Hal//). 



Distribution. From E. Africa to Japan, N. Australia, and the Pacific (Samoa). 



246. Pantjlirus penicillatus (Olivier). 



Palinurus penicillatus (Oliv.), Milne-Edwards, Hist. Nat. Crust, t. ii. p. 299 (1837). 



Panulirus penicillatus (Oliv.), Stimpson, Proc. Acad. Nat. Sci. Pbilad. Jan. 1860, p. 24. 



Senex penicillatus (Oliv.), Ortmann, Zool. Jabrb. Bd. vi. Abtb. f. Syst. p. 28 (1892), ubi synon. 



Ceylon (Haly). 



Distribution. From the Red Sea and Mauritius to the Malay Archipelago, N. 

 Australia, and the Pacific (Fijis, New Hebrides, Tahiti). 



247. Panulirus dasypus (Latr.). 



Palinurus dasypus (Latr.), Milne-Edwards, Hist. Nat. Crust, t. ii. p. 300 (1837). 



Senex dasypus (Latr.), Ortmann, Zool. Jabrb. Bd. vi. Abtb. f. Syst. p. 33, (1892), ubi synon. 



Silavaturai Par (Thurston). Common at Madras (J. JR. D.). 



The Silavaturai example is very young, measuring only 45 mm. in length, but is appa- 

 rently referable to this species. It has two pairs of spines, arranged as if at the angles 

 of a square, on the antennal segment, the posterior pair being smaller than the anterior 

 pair ; at a later stage small spinules are developed towards the centre of the square. 



Distribution. Indian Ocean (Milne-Edwards) ; Ceylon and Madras (Heller) ; Muscat 

 (Brit. Mus.) ; Moluccas (Her/dot). 



