602 E. J. ALLEN. 



The corresponding characters of S. variegata are described below 

 under that species. 

 Syllis (typosyllis) variegata Grube : Langerhans, Zeit. wiss. Zool. 

 XXXII, 1879, p. 532, Marenzeller, Sitzb. mathem.-naturw. CI. 

 LXIX. Bd. I. 1874, p. 441. Mcintosh, Mon. Brit. Ann. II. 1, 1908, 

 p. 161 as Pionosyllis prolifera (Krohn). 



Plymouth. Not uncommon in dredgings from Millbay Channel 

 and Asia Shoal. Off Yealm Head. One large specimen from the 

 shore at Wembury Bay amongst Laminaria roots. 



South by west of Eddystone in 44-49 fms. {Crawshay, Journ. M.B.A., 

 vol. 9, 1912, p. 340). 



The distinction between S. variegata and S. pivlifera will be seen 

 on comparing the following characters. In S. variegata Grube the 

 pharynx is long and slender, extending through as many as ten 

 segments when a fully grown worm is alive and crawling. The single 

 dorsal tooth is relatively smaller than in S. proUfera and lies close to 

 the anterior margin of the pharynx. 



The proventriculus is long and relatively narrower than in S. 

 prolifera. 



The end-pieces of the bristles are on the whole longer than those 

 of S. frolijera and are much less boldly bifid at the tip. The long 

 end-pieces are continued back to the posterior segments to a much 

 greater degree than in S. 'prolifera and the bifid character does not 

 to the same extent become more marked. 



Simple bristles occur in the posterior parapodia as in the former 

 species. Their bifid character is not easy to make out, but some 

 of the bristles seem to show it under a high power of the micro- 

 scope. 



The pigment is brown and the transverse figure of eight pattern 

 described by Grube and subsequent authors is very characteristic 

 on the anterior segments. This pattern is liable to considerable 

 modification, one extreme form of which is described and figured 

 by Mcintosh (p. 162, fig. 53). It will be seen that merely by thicken- 

 ing the different bars and dots figured by Mcintosh until their ends 

 touch the characteristic variegata pattern is produced. The largest 

 specimen of S. variegata which I have examined resembles Mcintosh's 

 description in colour pattern as well as in all other respects. 



The dorsal cirri are monihform and long, in most cases longer 

 than in S. prolifera. In a large specimen the median tentacle con- 

 tained about 42 articulations, whilst the lateral contained 20. The 

 dorsal cirri along most of the length of the body are alternately long 

 and short ; in the specimen referred to there were 43 articulations in 

 the long cirri and 20 in the short ones. The short cirri are carried 

 by the worm horizontally, whilst the long ones rise vertically and 

 arch over the back, the ends being frequently coiled. The long and 

 short cirri are of nearly uniform diameter throughout, thus dift'ering 

 from Syllis Krohnii Ehlers. 



