97 



australiensis Sp. Bate is identical, was observed by the "Challenger" at Port Jackson in water 

 of 2 — lo fathoms. Concerning P. iiiarginatus Miss Ratiibun (U.S. Fish Commission Bulletin 

 for 1903, Part III, Wash. 1906, p. 902) writes: "Large and mature specimens are found only 

 in deep water, medium and smallish specimens are restricted to shallow water along shore, while 

 the very young occur at the surface". About the vertical distribution of most other species 

 little seems to be known. 



742. Penaetis seiiiisii/catns de Haan. 



Penaeus semisiilcatus W. de Haan, Fauna Japon. Crust. 1849, p. 191, PI. XLVI, Fig. i. 

 Penaens semisulcatns J. G. de Man, in: Notes from the Leyden Museum, Vol. II, 1880, p. 185 



and in: Max Weber's Zool. Ergebnisse II, 1892, p. 510 (partim) and in: Zool. Jahrb. X. 



Abth. f. Syst. 1898, p. 6tj. 

 Penaeus seniisitlcatus A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1890, p. 450. 

 Penaeus vionodon C. Spence Bate, Report Challenger Macrura, 1888, p. 250, PI. XXXIV, Fig. i. 

 "i Penaeus monodon Th. R. R. Stebbing, South African Crustacea, Part III, 1905, p. 74. 

 "i Penaeus monodon A. Alcock, Catal. Indian Decap. Crustacea. Part III. Macrura. Fasc. i. 



Calcutta, 1906, p. 8, PI. I, Fig. i, \a — b. 

 Penaeus asJiiaka K. Kishinouye, in: Journal Fisheries Bureau, Tokyo, Vol. VIII, N" i, 1900, 



p. 14, PI. Ill and PI. VII, Fig. 4, 4 A, 4B. 

 Penaeus ashiaka M. J. Rathbun, in: Proc. U.S. Nat. Museum, Vol. XXVI, 1902, p. 38. 

 Penaeus ashiaka G. Nobili, in: Boll. Mus. Zool. Torino, N" 455, 1903, p. 2 and in: Bull. 



Scientif France et Belgique, T. XI, 1906, p. 16. 



Stat. 121. July 14 iG. Menado-anchorage. 55 m. i young male and i young female. 



Stat. 125. July 1819. Anchorage oft" Sawan, Siau-island. 27 m. Stone and some Lithothamnion. 



I young male and 2 young females. 

 Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings. Coralreefs, mud 



and mud with sand, i male of medium size captured at a depth between 9 and 



45 m. and 2 young males collected on the reef. 

 Stat. 299. January 2729. io°52'.4S., i23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- 



island. Depth up to 20 m. Mud, coral and Lithothamnion. i young male. 



I received from the Leyden Museum a type specimen of Penaeus semisulcatus de Haan, 

 an almost adult female, long 170 mm., from Japan and furthermore the two females of medium 

 size from Djeddah, Red Sea, referred by me (I.e. 1880, p. 185) to this species. The e.xamination 

 of these specimens led to the following conclusions: i" that the "Siboga" specimens, mentioned 

 above, belong to P. semis-iilcatus de Haan, 2" that the species described by Col. Alcock (1. c. 

 1906, p. 10, PI. I, fig. 2) as P. semisulcatus de Haan, does not belong to this species, 3" that 

 the species described by the same author as P. monodon Fabr. is very closely related to /'. 

 semisulcatus de Haan, if not identical, 4° that the species described by Spence Bate in the 

 Report on the Challenger Macrura as P. monodon, belongs to P. semisulcatus de Haan, 5" that 

 with DE Haan's species P. ashiaka Kish. from Japan is identical and 6" that the two young 

 females from Djeddah fully agree in all characters with the Japanese type of P. semisulcatus. 



In P. sef/iisulcatus de Haan the pereiopods of the 5'*^ pair are provided with a well 

 developed exopod, that is somewhat smaller than the exopods of the preceding legs. As 

 I already observed, the P. monodon of Alcock (I.e. 1906, p. 8) bears a close resemblance to 



97 



SIBOGA-EXPEDITIE XXXlXa. '3 



