CIRRATULUS CAITDATUS. 253 



4. Cirratulus bioculatus, Mcintosh, 1911 . Plate GUI, fig. 16— dorsal bristles ; Plate CV, 



fig. 19 — ventral bristles. 

 Synonym. 

 1911. Cirratulus cirratus, young, Mcintosh. Ann. Nat. Hist., ser. 8, vol. vii, p. 156. 



A small (young ?) form dredged in Shetland in 1867 by Dr. George Jeffreys presents 

 the peculiarity of having only two eyes ; and the head shows less of a basal constriction 

 than usual in examples of C. cirratus of the same size. The complete tentacles from the 

 fourth segment are of very great length, probably reaching in life beyond the tip of the 

 tail which has a similar termination to that of G. cirratus, the ventral papilla being the 

 more prominent. 



The tenth foot has dorsally a long slender tuft of finely tapered bristles (Plate CM, 

 fig. 16), whilst the ventral bristles are much shorter, the flattened tips being expanded 

 like a " bellied" knife and then tapered to a fine point (Plate CV, fig. 19). The hooks 

 by-and-by appear in both ventral and dorsal divisions and their shape corresponds with 

 that of the ordinary examples in G. cirratus. 



5. Cirratulus caudatcs, Levinsen, 1893. Plate C, fig. 13 — bristles, twentieth foot; Plate 

 CIX, figs. 14 and 14 a — bristles and hook ; Plate CXI, fig. 3 — head and anterior 

 region. 



Specific Characters. — Snout forming a blunt cone, with slight lateral furrows. Mouth 

 large with a crescentic groove posteriorly, and two lateral lips. Peris to mial seg- 

 ment without bristles, and so with the two following, the third bearing a pair of 

 tentacles. 



Body widens to the eighth or ninth bristled segment, is about two inches long; 

 segments fifty, one-ringed. Branchiae not observed behind the twelfth segment. Feet 

 form lateral ridges with dorsal and ventral setigerous processes, and a minute flat inter- 

 mediate papilla. A long dorsal tuft of capillary bristles, and a shorter one ventrally. 

 A stouter series appears at the thirtieth foot. Posteriorly are elongated hooks with 

 straight shafts and sharp curved tips. 



Synonyms. 



1893. Cirratulus caudatus, Levinsen. Kanonb. " Hauchs," p. 338. 



1911. Ghoetozone Dunmanni, Mcintosh. Ann. Nat. Hist., ser. 8, vol, vii, p. 160. 



Habitat. — Dredged in Dunmanus Bay, Ireland, and now in the collection of the Royal 

 Irish Museum. Levinsen found his examples in the Kattegat. 



The snout (Plate CXI, fig. 3) forms a blunt cone, with slight lateral notches which 

 may indicate sensory organs, and the peristomial segment is devoid of bristles. The mouth 

 opens ventrally as a large aperture, having a crescentic groove posteriorly and a median 

 furrow between the two lateral tips anteriorly. 



