TO INDIAN CAECINOLOGY. 433 



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

 the lower carpal spine is wanting. 



Distribution. JS'. Australia (Jliers') ; Amboina (De Man) ; Singapore ( TVatker) ; 

 Mergui {I)e Man). 



Group A s T A c I B E A. 

 Genus Thenus, Leach. 

 2M. Thenus orientalis (Eabr.). 



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



Common at Madras and on the South Indian coast generally {J. B. II.). 



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 (Pabr.). 



Paliimrus ornatus (Fabr.), Milne-Edwards, Hist. Nat. Crust, t. ii. p. 296 (18:37). 

 Pa?uilirus ornatus (Fabr.), Stimpsoii, Proc. Acad. Nat. Sci. Pbilad. Jan. 1860, p. 21. 

 Senex ornatus (Fabr.), Ortmaun, Zool. Jalirb. Bd. vi. Abth. f. Syst. p. 34 (1892), iibi synon. 



Ceylon [Haly). 



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



246. Panulirus penicillatus (Olivier). 



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



Panulirus penicillatus (Oliv.), Stimpson, I'mc. Acad. Nat. Sci. Pliilad. Jan. 1860, p. 24. 



Senex penicillatus (Oliv.), Ortmaun, Zool. Jahrb. J5(l. vi. Ahtb. f. Syst. p. 28 (1892), ubi .^ynon. 



Ceylon (Hali/). 



Distribution. Prom the Ued Sea and Mauritius to the Malay Archipelago, X. 

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



247. Panulirus dasypus (Latr.). 



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



Senex dasypus (Latr.), Ortmaun, Zool. .laluh. Hd. vi. Abth. f. Syst. p. 33, (1892), itbi synon. 



Silavaturai Par (Thurston). Common at Madras {J. B. R.). 



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 spimiles arc developed towards the centre of the square. 



Distribution. Indian Oce;ui {.Milne-Bdwards) ; Ceylon and Madras (Relier) ; Muscat 

 {D?it. Mus.) ; Moluccas [Ilerklot). 



