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as also along the coasts of India, hut /'. latisii/catiis is not vet known from these coasts and 

 its occurrence in the Red Sea appears still uncertain. The fourth indopacific species of this 

 sectiün, F. plebcJ2is Hess, has still only been recorded from Sydney and Port Jackson, while 

 the male is unknown. 



P. semisulcatus de Haan is distributed from Japan, the Philippine Islands and New 

 Guinea, along the coasts of India, to the Red Sea, where it has been observed at Djeddah and 

 even at Suez; a variety exsjilcatus Hilgd. is known from the coast of Mozambique. P. carinatiis 

 Dana, discovered at Singapore, was taken by the "Siboga" at Makassar and in the Java Sea, 

 but this species ranges also from Karachi, along the coasts of India, to the Andamans and 

 Mergui and occurs even in the seas of Japan, though it is here a rare species. P. indicus 

 H. M.-Edw. is distributed along the coasts of India from Karachi and Bombay to Singapore; 

 it is known from Ouellimane and Dar-es-Salaam on the east coast of Africa, as also from Java 

 and Amoy, but this species was not taken by the "Siboga". Instead of the typical species, 

 however, the variety longirostris, described by me in 1S92, was captured in the Bay of Bima 

 and near Saleyer, while it was previousl)- known from Makassar. This variety has not yet 

 been observed outside of the East Indian Archipelago, as far as I am aware. Another variety 

 of P. iiidiais, viz. penicillatus Alcock, is distributed from Karachi and Bombay to Mergui. 

 P. merg-iiiensis de Man which previously was considered to be also a variety of P . indicus^ 

 was taken by this expedition in the Bay of Bima, off Makassar and on the west coa.st of New 

 Guinea, but this species occurs also at the Philippine Islands, in the Bay of Bengal and along 

 the coast of India as far as Bombay and Karachi. 



P. inonodon (Fabr.) Alcock is known from Suez and occurs on the coasts of India to 

 the Gulf of Martaban, but this species is probably identical with P. seiiiisuh-atiis. 



P. esculenhis Hasw. is the common edible prawn of Sydney and the east coast of 

 Australia ; it seems to be closely related to P . carinatiis, but to differ by its very .short anten- 

 nular flagella. P. gracilirostris Thallwitz is known from North Celebes, it is a rare species 

 which mostly approaches to P. semisulcatus de Haan. P. niarginatus Rand. is still only known 

 from the Hawaiian Islands and the beautiful P . coeruleus Stebbing has still only been observed 

 in the Nahoon river, which is tidal for several miles inland, near East London on the east coast 

 of South Africa. 



Seven species besides the varietj- longirostris of P. indicus are at present known to 

 inhabit the East Indian Archipelago. P. brcvirostris Kingsley occurs on the west coast of 

 America from San Erancisco Bay, California, to the Bay of Sechura, Peru and at the Galapagos 

 Islands-, it is the representative of P. brasiliensis Latr. from the Atlantic. P. balboae Fax. is 

 also found on the west coast of Central America, and, finally, also P. stylirostris Stimps., 

 with which P. occidentalis Streets from Panama is considered by Miss Rathbun to be identical, 

 and which ranges from Panama to the north coast of Peru. 



The species of Penaeus are littoral or sublittoral forms, though they descend sometimes 

 to considerable depths. So e. g. P. balboae Fax. that was taken at a depth of 770 fathoms; 

 P. brasiliensis is a littoral or sublittoral species, but it was captured by the "Blake" west of 

 Tortugas, in water of 950 fathoms. P. plcbejus Hess, with which P. cajialiculatus (Oliv.), var. 



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