22 SABELLARIA ALVEOLATA. 



Fauvel 1 (1914) mentions two varieties of Sabellaria spinulosa— one from Guernsey, 

 which he has named 8. spinulosa, var. Intoshi It had been described without a name by 

 the author in February, 1914. 



Crawshay found the crustacean Anthura gracilis in a tube of this species from a 

 depth of 42 fathoms off Plymouth, and he thought it Avas preying on the annelid. It 

 may be a commensal or an accidental visitor. 



2. Sabellaria alveolata, L., 17G7. Plate CXII, figs. 4, 4a; Plate CXVII, fig. 3— 

 body ; Plate CXVIIT, fig. 2— tubes ; Plate CXXIII, figs. 3—3 e— palea3, bristles 

 and hooks. 



Specific Characters. — Cephalic region with a less boldly bifid crown than in 

 S. spinulosa, but with three rows of very regularly arranged paleas, which are surrounded 

 by a more highly developed series of filiform papilla. The outer paleas are shaped like 

 a cricket-bat with a long tapering handle and unequal shoulder, the tip slightly bent and 

 split into five or six teeth directed or curved to the front, the second the largest and 

 most curved. The second row has palese resembling a large, heavy foot with a slender 

 tapering leg. The third, or inner set, form an oblique palisade, and each has a long 

 tapering terminal blade from which the shaft comes off at a large angle. Cephalic and 

 buccal region shorter than in 8. spinulosa and coloured brownish-purple. No long, 

 simple bristles running longitudinally on each side of the dorsal median line. Body of 

 two regions as in S. spinulosa, besides the caudal tube ; three segments in the first region, 

 about thirty-four bristled segments in the second. Length to the tip of the abdominal 

 appendage 2| inches ; breadth anteriorly at the peristomial lobes 6 mm. Branchise short, 

 thick, and greenish, first three with broader, flattened bases and more slender tips than 

 the rest. Bristles of the first region oar-shaped, slightly fringed, and with long shafts, a 

 slender, finely spinous form occurring between each. In the second region no dorsal 

 bristles occur. Ventral bristles of two kinds, viz. those having oar-shaped, long tips 

 minutely spinous, and others witli slender shafts and tapered tips bearing minute whorls 

 of spikes. Hooks similar to those of S. spinulosa, with six teeth in lateral view, but the 

 basal end is more distinctly truncate distally. Aggregated tubes of sand-grains forming 

 larger masses than in 8. spinulosa. 



Synonyms. 



1711. Vers a tuyau, Reaumur. Mem. Acad. R, So,, p. 128, pi. ii, figs. 15 17. 



175G. Tubularia arenosa anglica, Ellis. Corall., p. 104, pi. xxxvi, figs, a— e, and figs. A, B, C. 



1758. Tubipora „ LintiaBus. Syst. Nat., edit, x, vol. i, p. 790. 



1767. Sabella alveolata, idem. Syst. Nat., edit, xii, p. 1268. 



1774. Psamatotus a tuyau conique, un peu applati, et qui a un couvercle, G-uettard. Mem., t. hi, p. 68, 



pi. lxix, fig. 2. 

 1777. Sabella rudis, Pennant. Brit. Zool., vol. iv, p. 147, pi. xcii, fig. 162. 

 1801. „ alveolata, Donovan. Brit. Shells, vol. in. Tab. cxxxix. 

 1805. „ „ Montagu. Test. Brit., p. 540. 



i t 



Arch. Zool. Exper./ t. liv, p. 139. 



