TEREBELLA. 237 



4. T. nebulosa, branchiae arborescent, without lobe-like appendages ; 

 setigerous feet 23 pairs ; dorsal surface of the anterior segments 

 crenate and tessellated; "body spotted with white, having 13 

 dorsal plates/' Length 6-7" ; breadth 6'". Tube " composed of 

 slimy matter, covered with gravel and broken shells." 



Terebella nebulosa, Montagu in Linn. Trans, xii. 343. tab. 12. f. 2. 

 M. -Edwards in Ann. des Sc. nat. iii. 147 (1845), pi. 5, 6, 7 & 8, 

 reproduced in Voy. en Sidle, i. 21. Williams in Rep. Brit. Assoc. 

 1851, 170, 183, and in Ann. 8f Mag. Nat. Hist. xii. 408. pi. 14, 

 f. 1-3. Quatrefages, Souven. ii. 46. 



Hab. The coralHne region. 



Desc. " Body long, orange-red, spotted all over with white. An- 

 terior extremity very tumid, defended by the dorsal plates * ; anterior 

 peduncles very small, with the fasciculi pointed. The other pedun- 

 cles and fasciculi are broad. The posterior end is abruptly smaller 

 than the other, as if it had been lost by accident and afterwards 

 reproduced. The capillary tentacula are numerous, and of a pale 

 orange colour spotted with white. Branchiae red, with white spots." 

 — Montagu. 



The spots disappear in preserved specimens. The anterior portion 

 of a full-grown specimen is as thick as a man's little-finger, and 

 tapers into the cylindrical tail consisting of numerous narrow seg- 

 ments. The dorsal half of the anterior segments is crenated on each 

 margin, and wrinkled longitudinally so as to be divided into little 

 squares, — a structure, perhaps, peculiar to the species. The nume- 

 rous tentacula arise from above the upper lip, which is everted. 

 The setigerous feet are proportionably small, and the lines formed 

 by the uncini are linear-elongate, extending from the setigerous 

 tubercle to the sternal band. The bristles and uncini present no 

 peculiarity. 



(a) Tenby, Dr. J. Goodall. 



(b) Falmouth, W. C. Cocks. 



(c) Berwick Bay, Br. Johnston. 



5. T. gigantea, "with 17 pairs of exserted fasciculi and 8 dorsal 

 plates." Length 16". 



Terebella gigantea, Montagu in Linn. Trans, xii. 341. tab. 11. 

 Hab. " Inhabits the Devon coast, but is very rare." — Montagu. 



Desc. "Body long, with numerous articulations furnished the 

 whole length with peduncles, and a few with fasciculate bristles ; 

 but the seventeen anterior joints have the fasciculi most conspicuous, 

 being always erected, and remaining so after death : the first eight 

 joints have a broad plate on the back, different in structure from the 

 rest ; they are of a rufous-brown colour, shaded with purpHsh-black, 



* By " dorsal plates " Montagu means the segments of the sternal or abdo- 

 minal band, mistaking the ventral for the dorsal surface. 



