the sternum. This posterior part appears broader backward than forward, its lateral margins are 

 slio-htly concave and make right angles with the anterior margin ; it is furrowed longitudinally 

 in the middle, the narrow furrow passing into the cavity of the cyathiform organ and, at 

 either side of the median furrow, one observes another groeve that runs obhquely. In younger 

 specimens the three grooves are less distinct, the middle one often wanting. 



Trachypenaeus Alcock. 



Seven or eight species constitute the small genus Tracliypoiacus, which is represented 

 both in the Atlantic and in the Indopacific. Trachyp. constrichis (Stimps.) occurs along the 

 east coast of North America from the Chesapeake Bay to Porto Rico and Sombrero Island, , 

 and Trachyp. siinilis (S. I. Smith) which, however, is regarded by Alcock as a variety of 

 the former, has been observed in the West Indies, near Porto Rlco, off the coast of Florida 

 and in the Gulf of Paria. Trachyp. anchoralis (Sp. Bate) inhabits the East Indian Archipelago, 

 this species, indeed, was discovered by the "Challenger" in the Arafura Sea, while it was 

 captured by the "Siboga" at four rather remote Stations; it is recorded by Pearson from the 

 coast of Ceylon and by the author of the Report on the Challenger Macrura from off Yoko- 

 hama, but it seems to me probable that the specimens of the last named locality will prove 

 to belong to Trachyp. curvirostris (Stimps.). Trachyp. graiuilosus (Hasw.) is known from 

 Torres Strait. Trachyp. aspcr Alcock is an inhabitant of the Persian Gulf and the Bay of 

 Bengal, while Trachyp. curvirostris (Stimps.) seems to be confined to the seas of Japan; this 

 species, indeed, is found along the Pacific coast of that country from the Bay of Awomori to 

 Kagoshima, but it occurs also in the Inland Sea. In Japan, as Kishinouye writes, it is captured 

 in large quantities, used as food and bait and known under the names of "saruyebi", "kosa- 

 kuyebi" and "atamabuto". 



One new species, Trachyp. salaco, was discovered by the "Siboga", specimens were 

 captured both at the eastern and at the western extremity of the Banda Sea. 



Thoug^h two females of Trachyp. curvirostris are said to have been caught, in the 

 Inland Sea of Japan, in deep water (de Man, in: Trans. Linnean Soc. London, 1907, p. 436), 

 the other representatives of this genus seeni to be shallow-water species. Trachyp. anchoralis 

 was taken by the "Siboga" at a depth of 141 m. at Stat. 153, but at Stat. 162 only in water 

 of 18 m. Trachyp. asper was collected in water of 60 fathoms, but also between 20 and 35 



87 



