12 SABELLAEIA SPINULOSA. 



slightly larger, and the wall consists only of two layers, whereas there are four or five in 

 the middle " (in lit.). It is possible that some of the very coarse tubes figured by the 

 earlier authors, such as Martini, may represent those of this form. 



Bernardi (1911) mentions the occurrence of a species at a depth of 555 — 235 m. in 

 the Mediterranean. It would be satisfactory to ascertain if it is the same form as Allen's. 



It is interesting to note how closely the bristles of Fauvel's PJialacrostemma elegans 1 

 approach those of this species, whilst differing in minute detail, the cephalic hook, for 

 instance, being less curved. 



Genus CXXXIII. — Sabellaria, Lamarck, 1818. 



Prostomium small, having in front of it the two moveable pillars, disc-like in front, 

 and provided with three concentric rows of golden paleae, whilst ventrally are numerous 

 tentacles in several transverse rows. Mouth opens in the centre between the cephalic 

 pillars. The second segment has a fascicle of two capillary bristles. Segments 3, 4 and 

 5 each with a lateral ramus of paleae and capillary bristles and a ventral fascicle. The 

 other segments have uncinigerous pinnules dorsally and tufts of capillary bristles ventrally. 

 Body of three regions — including the caudal tube — the anterior broad, flattened, divided 

 into segments, branchiferous ; the second with branchiae and lateral lamellae for the 

 hooks, and sometimes with bristles. The caudal tube is devoid of appendages. Branchiae 

 cirriform or ligulate, dorso-lateral, from the third segment backward, gradually diminishing 

 and disappearing. Bristles of various kinds simple, paddle-like, brush-like and whorled, 

 often minutely serrate. Hooks pectiniform, rather elongate, with five or six teeth. Tube 

 of agglutinated sand-grains, solitary or in masses. 



1. Sabellaria shnulosa, R. Leuchirt, 1849. Plate CXII, figs. 1 — lc; Plate CXVIII, 

 figs. 3 and 3 a — tubes and opercular crown ; Plate CXXIII, figs. 2 — 2 i — bristles and 

 hooks; Plate CXXIV, figs. 10— 10 £— bristles. 



Specific Characters. — Head with a bifid opercular crown carrying three rows of 

 paleae, the outer having broad paddle-shaped tips with a spiked median process and 

 three strong spikes at each side, the middle shaped like a bill-hook or with long dagger- 

 shaped points, and the inner having the tip bent at an angle, with a heel and long toe 

 like a shoe. Cephalic, buccal, and first body-segments form a firm and muscular anterior 

 region. Mouth with a transverse series of six ridges bearing purple tentacles at each 

 side. First region of the body of three segments carrying branchiae, short lamellae with 

 powerful spatulate dorsal bristles borne laterally, the tips of which are split like brushes, 

 and rudimentary delicate spinous bristles between them. Ventrally are minute bristle- 

 tufts of like arrangement and structure. Purplish-brown pigment on the dorsum, sides, 

 and other parts. The second region (of about twenty-eight segments) has branchiae and 

 bristles dorsally, laterally lamellae— deep in front, but long and cirrus-like in the posterior 



i ( 



Camp. Scient./ Fasc. xlvi, p. 270, pi. xxiv, figs. 1 — 16, 1914. 



