Arenicola olacialis 111 



Floridan Keys, in the West Indian Islands, e.g. Jamaica and Santa 

 Cruz, and in the Bermudas. It was reported by the writer from 

 Curajao, this being the first record from South America. 



A. cristata has been known for more than twenty years from 

 Naples, but has not been recorded from any other station in the 

 INIediteiTanean. It was never common at Naples, and latterly seems 

 to have become more rare. 



This species is evidently widely distributed in the Indo-Pacific 

 Ocean, but it has, as yet, been found only at a few stations. Mr. 

 Crossland obtained it in the mud flats near Suez, and the M-riter has 

 recorded specimens from Barrow Island (north-west Australia), from 

 Misaki and Tomo Harbour, Jajmn, and from San Pedro and Monterey 

 Bay, California. 



The range of distribution may be stated thus :—A. cristata 

 is known from Naples, Suez, the warmer parts of the Indo- 

 Pacific Ocean (records from north-west Australia, south Japan and 

 California), the Atlantic sea-board of the United States from Wood's 

 HoU southwards, the Bermudas, and the eastern parts of the (Julf 

 of Mexico and the Caribbean Sea (including the West Indies). 



All the stations at which specimens have been obtained are in 

 latitudes less than 40°, except Naples and Wood's Holl, whieli, 

 however, are very little north of this parallel. A. cristata appears 

 therefore to occur only in the tropics or on the shores of the warmer 

 temperate regions ; its distribution thus presents a sharp contrast to 

 that of the nortliern A. marina and tlie austral A. assimilis. 



Murdoch, Rep. Intcrnat. Polar E.xped. to Point Barrow, Alaska (1885). 



p. 15.5; Proc. U.S. Nat. Mus. 1884, vii (1885), p. .522. 

 Ashworth, Proc. U.S. Nat. Mus., xxxix (1910), p. 24. 



Caudate yl/-c«iWrt with seventeen chaetiferous segments; eleven 

 pairs of small gills, the first .situated on the seveuth segment ; the 

 gill-axes are very slunt and bear at their distal ends few branches, each 



' For other figures of this species, see Fig. 23, p. 52, crotchets ; Figs. 33, 34, 

 p. 60, gills ; Fig. 39, p. 69, statocyst. 



