12 



3. Peneus indicus, Edw. Plate I. fig,, 3, 3a. 



PewKus i«ciicas, Milae Edwards, Hist. Nat. Crast. II. p. 415, 1837: Dana, U.S. Expl Exp, Crust, pt. I., 

 p. 604, 1852 : Heller, Novara Crnst p. 122, 1865 : Hilgendorf, MB. Ak. Berlin, 1878, p. 844 : Miers, P.Z.S., 1878, 

 p. 301: Spence Bate, Ann. Mag. Nat. Hist. (5) VIII. 1881, p. 177, pi. xii. fig. 5, and Challenger Macrura, 1888, 

 p. 248, pi. xxxiii. fig. 2 : de Man, in Max Weber's Zool. Ergebn. Niederl. Ost-Ind. II. 1892, p. 511 pi. xxxix. fig. 

 53 and Zool. Jahrb., Syst., X. 1898, p. 680 : Henderson, Trans. Liun. Soo. (2) V. 1893, p. 447 : Ortmann in Se- 

 moa's Zool. Porschnngsr. Austral, etc. 1894, p. 10 : Lanohester, Ann. Mag. Nat. Hist. (7) VI. 1900, p. 263 : Nobili, 

 Ann. Mus. Geneva (2) XX. 1900, p. 474, and Boll. Mus. Torino, XVI. 1901, No. 397, p. 2, and XVIII. 1903, 

 No. 447, p. 1, No. 452, p. 2, and No. 455, p. 2. 



This is an extremely variable species, especially in respect of the length of 

 the rostrum, which in young individuals projects far beyond the tip of the 

 antennal scale, whereas in adults it is often not longer than that of P. monodon. 



Large adults of P. indicus strongly resemble P. monodon, but differ con- 

 stantly in the following particulars : — 



The post-antennular ("antennal") and hepatic spines are not so strong and 

 salient: the post-antennular or hepatic sulcus is not nearly so deep, and the 

 ridges defining it are not so prominent: and there is no sub-hepatic ridge defin- 

 ing the branchial region anteriorly. 



The rostrum has a manifest double curve, and usually reaches beyond the 

 tip of the antennular peduncle; dorsally it has 8 — 10 teeth, ventrally 4 — 6. The 

 groove ou either side of the rostrum ends beside the last (epigastric) tooth. 

 The post-rostral crest is faintly canaliculate, and ends nearly an eye-length in 

 front of the posterior border of the carapace. 



The upper (outer) antennular flagellum is about 1^ times the length of the 

 peduncle. 



The sixth abdominal somite is as long as the telson. 



This species attains a length of about 8 inches. It occurs all round the 

 coasts of India and Ceylon, from Karachi to the Andamans. 



There are 112 specimens in the collection, registered as follows : — 



3007-9 4371-72 



Karachi Karachi Museum. 



Pulicat (Madras). ^ 



C " Investigator." 



Orissa and Ganjam. ) 



Malabar coast. J. Wood-ilasou. 



Madi-as. Purchased. 



Colombo. J. Anderson. 



Andamans. G. H. Booley. 



