1904. 



MARIXE FAUNA OF ZANZIBAR. 



30- 



taken from anterior feet differ somewhat from those from 

 posterior. Compare a and h in text-fig. 51, p. 302, which are from 

 the 50th and the 10th foot respectively of the same specimen. 

 The anterior feet may contain thi-ee acicula, some of which end in 

 peculiarly elongated points (text-fig. 51, c). Posteriorly a single 

 thicker aciculum (cZ) accompanies a slender but black acicular seta 

 which ends distally in two small hooks. These latter project 

 markedly from posterior feet. 



The subjoined table gives the principal variations obsei'ved in 

 the specimens from the Maldives and Seychelles. 



Eunice tubifex, sp. n. (Plate XXI. figs. 1-8.) 



One of the five % species which make stiff leathery tubes witli 

 lateral openings. This is distinguished from all other species of 

 the genus except E. depressed Schm.§ by the possession of both the 

 kinds of compound setse found in the family, viz. those with knife- 

 shaped and those with hooked sickle-shaped end-pieces. The 

 former occur in the anterior feet, then for a short distance both 

 together, and finally for the greater part of the body's length the 

 ordinary " Sichelborsten " occur alone. 



The worms were first collected through the kindness of Capt, 

 Agnew, R.ISr.R., who allowed me to accompany the Zanzibar 

 Government Steamer when engaged in putting fresh chains to 

 the buoys which mark the southern approaches to Zanzibar. The 

 tubes, which are a foot or more long by about three- eighths of an 

 inch in diameter, were found attached singly to the chains, from 

 which they projected horizontally. All were overgrown with 

 hydroids, polyzoa, and alcyonarians, which, with the organisms 

 collected from the under surface of the buoys themselves, formed 



* This is one of the specimens in which the gills overlap across the back. The 

 gills are not abnormally complex. 



t The tentacles are abnormally slender distallj' and may haye been injured. 

 J See second note on page 308. 

 § See first note on page 308. 



