EPHESIA PERIPATUS. 51 



dorsal cirrus ; and a ventral cirrus, which in the third and fourth segments has papillae on 

 the enlarged base. Bristles with jointed tips. 



Synonyms. 

 1845. Pollicita peripatus, Johnston. Ann. Nat. Hist., vol. xvi, p. 4, Tab. ii, fig. 1 — 6. 

 1851. Bphserodorum peripatus, Grube. Fam. Annel., pp. 67 and 134. 

 1856. Pollicita „ Thompson. Fauna Ireland, vol. iv, p. 434. 



1863. Bphserodorum „ Claparede. Beobacht., p. 50, Taf. xi, fig. 8—18. 



1864. „ „ Kolliker. Kurzer Bericht., p. 9, Taf. vi, fig. 1. 



1865. „ „ Johnston. Cat. Worms Brit. Mus., p. 208. 

 „ Pollicita „ De Quatrefages. Annel., t. ii, p. 85. 



1894. Ephesia „ De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 41. 



„ ? „ abyssorum, Bidenkap. Christ. Vid.-Selsk. Forhandl. (after Hansen), p. 93. 

 1908. „ peripatus, Mcintosh. Ann. Nat. Hist., ser. 8, vol. ii, pp. 529 and 540. 



1910. „ „ Elwes. Journ. M. B. A., vol. ix, p. 61. 



1914. „ „ Southern. Proc. Roy. Irish Acad., vol. xxxi, pt. 47, p. 89. 



Habitat.— The Clyde area (Kolliker) ; Channel Islands (W. C. M.) ; Torquay (Elwes); 

 Clare Island district (Southern). 



Gulf of St. Lawrence, Canada, dredged by Dr. Whiteaves. 



Head similar to that of E. gracilis, with four tentacles, and it is often retracted. 

 The two lateral globular cirri with short papillae. 



Body resembles that of the common species, and is about two inches in length, some- 

 what spindle-shaped, and terminating posteriorly in two globular papillae with the anus 

 between, and an unpaired ventral cirrus inferiorly (Claparede). 



The foot presents dorsally a globular cirrus with a papilla at the extremity, and near 

 its base a gland with coiled contents. The setigerous region forms a cone with small 

 papillae thinly scattered over its distal region, and a larger process or cirrus ventrally 

 below the tip. Anteriorly the base of this process is hirsute and a longer papilla occurs 

 at the tip of the setigerous process (third and fourth segments). 



The bristles are more slender than those of E. gracilis, but the distal end of the shaft 

 has a similar curvature. The bevelled end is much less produced, and the enlarged region 

 on the whole more nearly approaches that of a Syllid. Moreover there is an articulated 

 appendage which starts from a broad base and has a sharp hook-like tip, the curvature 

 dorsally being convex and ventrally concave (Plate CIII, fig. 10). Such a bristle differs 

 from the long, hook-like tip of the shaft in E. gracilis, which theoretically might be 

 supposed to arise after the shedding of the terminal process, by the free growth of the 

 end as a hook-like structure. 



A detailed account of this form, which he clearly differentiated from Ephesia gracilis, 

 was given by Claparede in 1863 with figures. He showed the simple nature of the alimen- 

 tary apparatus, for after the folded oesophagus the stomach formed an ovoid enlarge- 

 ment, and the intestine ran straight from this to the vent. The peculiar and forwardly 

 directed ganglia of the ventral chain have not been seen in the sections of the northern 

 forms. The author likewise gave an account of the contents of the globular dorsal cirri 

 and the glands in the foot beneath them. He pointed out that (Ersted's association of 

 the genus with the Ariciidae could not hold, nor that of Johnston with the Goniadidae. 

 He was inclined to link it on to the Syllidae. 



