174 EUSYLLIS TUBIFEX. 



has dorsally the tapering cirrus, the distal crenations being better marked in the anterior 

 than in the posterior feet. Setigerous region conical, with a fan-shaped series of bristles, 

 the curves of which increase from the dorsal to the ventral edge. The terminal piece is 

 comparatively short and bifid, the hooks being directed upward. A well-developed tuft 

 of cilia occurs between the dorsal cirrus and the setigerous lobe. Ventral cirrus is ovate, 

 with a bluntly conical tip which does not reach the end of the setigerous region. 



Synonyms. 



1855. Syllis tubifex, G-osse. Ann. Nat. Hist., ser. 2, vol. xvi, p. 31. 



1865. „ „ De Quatrefages. Annel., II, p. 24. 



1869. Eusyllis „ Mcintosh. Trans. R. S. Edin., xxv, p. 414, pi. xv, f. 21. 



1874. , ; „ idem. Ann. Nat. Hist., ser. 4, vol. xiv, p. 198. 



1875. „ „ Mcintosh. Invert, and Fishes St. Andrews, p. 121. 

 1891. „ } , Hornel. Trans. Liverp. Biol. Soc, vol. v, p. 244. 

 1901. „ „ Whiteaves. Rep. Geol. Surv. Canada, No. 722, p. 81. 



Habitat. — In vast numbers in membranous tubes on the blades of Laminaria saccharina 

 tossed on shore by storms. It is thus common both in the laminarian region and in deep 

 water amongst alga3 and zoophytes. When the debris is placed in sea-water the annelids 

 congregate at the water-line of the vessel. Stomach of the haddock, St. Andrews (E. M.). 



Le Havre Bank, Nova Scotia ('Challenger'). Madeira (Langerhans). Canada (W.C.M.). 



Head (Plate LIX, fig. 13) somewhat ovoid, with a pair of comparatively small 

 red eyes on each side in the usual oblique position, the anterior being slightly larger and 

 wider apart than the posterior. Palpi of considerable length, ovoid, joined at the base in 

 front of the snout, and richly ciliated internally, besides having in front some motionless 

 microscopic palpocils. The pair in outline resemble the sole of a ruminant's foot. They 

 are capable of various movements of extension and contraction. The median tentacle is 

 longer than the two lateral. One palpocil in each segment of the tentacle is generally 

 prominent, though sometimes there are two. The three tentacles are often gracefully 

 coiled, and when the animals are vigorous the base is comparatively smooth, while crena- 

 tions and a moniliform condition occur distally. 



Body of about fifty-six segments, and about five eighths of an inch in length. It is pale 

 and translucent anteriorly, the pharynx having a bluish- white iridescence and a brown speck 

 or two. The proventriculus is opaque-whitish and dotted. Behind the latter is a pale 

 portion, then the intestinal region is pale brownish, increasing in depth towards the tail, 

 which, however, occasionally has its tip pale. A series of opaque-white grains is grouped 

 on the dorsum from the proventriculus to the tip of the tail. A faint, reddish streak 

 occurs just behind the former. All the cirri are pale. The body is little tapered anteriorly, 

 but diminishes rapidly posteriorly where it terminates in two long moniliform cirri with 

 palpocils. A short and somewhat lanceolate process marks the end of the body between 

 the cirri. The cirri of the first four segments are longest and most distinctly moniliform. 

 The sixth is shorter and is generally carried horizontally outward, and the rest are about 

 the same length, but with less evident crenations towards the tail, where they become a 

 little longer and more slender. All have palpocils — most developed towards the tip. The 



