114 FLABELLIGERA BUSKIL 



Miss JSTewbigin 1 (1900), in her account of the forms procured in the Clyde, concluded 

 that Siphonostoma dijplochaitos, S. affinis, and 8. Glaparedii may be varieties of the same 

 species, a view put forward by Cunningham and Ramage 2 many years previously. 



Kurt Grunther 3 (1912) gives a detailed account of the histological structure of this 

 form, which he thinks is probably "intermediate between the Terebellids and the 

 Serpulidse." 



2. Flabelligera affinis, var. 



A form dredged in the c Porcupine ' Expedition of 1869 in 110 fathoms on a sandy 

 ground off Valencia, Ireland, varies a little in the great length of the urn-shaped papillse 

 and in the less clavate form of the other kind, the tips, indeed, being elongate-ovoid. The 

 frontal bristles are translucent and slender (Plate XCVII, fig. 4), and their articulations 

 are longer than in F. affinis. The claw at the tip of the hook (Plate XCVII, fig. 4 a) is 

 longer and more distinctly curved, and the articulations of the shaft are wider. It is right 

 to add, however, that considerable differences exist between the young forms and the 

 adults of F. affinis, and this specimen is comparatively small. 



Similar remarks apply to a fragmentary example from the ' Porcupine ' Expedition 

 of 1870, dredged in 257 fathoms in the Atlantic. The slenderness of the shafts of the 

 hooks, their wide articulations, and the size of the terminal claw bring this variety near 

 Flabelligera Buskii. 



3. Flabelligera buskii, Mcintosh, 1869. Plate XCVI, fig. 11— papilla; Plate CII, 

 figs. 3—3 b— bristle and hook ; Plate CIV, figs. 8—8 6— bristles. 



Specific Characters. — Body about half an inch in length and having the outline of a 

 young example of F. affinis, both as regards gelatinous investment and the urn-shaped 

 and clavate papillaG, but the former have a coarser central axis, and the latter are smaller 

 and have thicker stalks. Palpi pale ; body and branchiae bright red. Frontal bristles 

 translucent and delicate, and the articulations wide. Hooks have slender shafts with 

 longer articulations, and the terminal claw is wider toward the base, is longer, and has a 

 smaller angle with the shaft ; hooks often in pairs. 



Synonyms. 

 1869. Siphonostoma bushii, Mcintosh. Trans. Roy. Soc. Edinb., xxv, p. 420, pi. xv, fig. 13 a; and 



pi. xvi, figs. 4 and 4a. 

 1908. Flabelligera buskii, Mcintosh. Ann. Nat. Hist., 8 ser., vol. ii, p. 533. 



Habitat. — Brought up by a fisherman's hook on a stone with Ascidians, sponges, etc., 

 in the Minch, August, 1865. 



Body about half an inch in length, with considerably fewer segments, but of the 

 general shape of a young F. affinis, and also enveloped in a gelatinous investment, and 



1 ' Ann. Nat. Hist./ ser. 7, vol. v, p. 195. 



2 ' Trans. Eoy. Soc. Edinb./ vol. xxxiii, p. 677. 

 Jen. Zeitschr., Naturw/ xlvii, pp. 98—186, 1 pi. and 55 figs. 



3 t 



