97 



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

 of 2 — lo fathoms. Concerning P. inarginatns Miss Rathbun (U.S. Fish Commission Bulletin 

 for 1903, Part 111, W'ash. 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. Pcnaetis seiiiisti/cafus de Haan. 



Penaeus semisulcatiis W. de Haan, Fauna Japon. Crust. 1S49, p. 191, PI. XL VI, Fig. i. 

 PenacHS scinisulcatiis 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. 677. 

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

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

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

 ^Penaeus monodon A. Alcock, Catal. Indian Decap. Crustacea. Part III. Macrura. Fase. i. 



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

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



p. 14, PI. III and PI. VII, Fig. 4, 4A, 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: Buil. 



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



Stat. 121. July 14/16. Menado-anchorage. 55 m. i young male and i young female. 



Stat. 125. July iS'19. Anchorage ofF 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 27/29. 10° 52'. 4 S., 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 Lej-den 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 (1. c. 1880, p. 185) to this species. The examination 

 of these specin»ens led to the following conclusions : 1° that the "Siboga" specimens, mentioned 

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

 1906, p. 10, PI. I, hg. 2) as P. semisulcatiis 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 P. 

 semisulcatus -di^t Haan, if not identical, 4" that the species described by Spence B.\te in the 

 Report on the Challenger Macrura as P. monodon, belongs to P. semisulcatiis 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. semisulcatus de Haan the pereiopods of the s'*' 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 (1. c. 1906, p. 8) bears a close resemblance to 



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SmOGA-EXPEDITIE XXXIX <2. I3 



