238 TEREBELLID.E. 



continuing down the back in a decreasing line. The general colour 

 of the other parts is yellowish. Beyond the first seventeen joints 

 the peduncles are very small, and appear to be destitute of fasciculi ; 

 and they incline gradually from the sides to the back, till towards 

 the extremity they almost meet, forming two dorsal lines. Near the 

 mouth originate numerous capillary appendages, that are 5 or 6 

 inches in length ; the three pair of branchiae are much ramified and 

 red." — " T. yigantea is the largest of the discovered species ; it in- 

 habits the soil at the bottom of the sea, and seems to be destitute of 

 any case. We found one specimen in the estuary of Kingsbridge at 

 low water ; it discharged an orange-coloured fluid from its mouth in 

 great abundance." — Montagu. 



6. T. constrictor, branchise arbuscular; setigerous feet 17 pairs; 

 body orange-red, unspotted; sternal band with about 14 segments 

 not narrowing posteriorly. Length 3-4". Tube cylindrical, com- 

 posed of mud, fragile, horizontal. Diam. 4-6'". 



Terebella constrictor, Montagu in Linn. Trans, xii. 343. tab. 13. f. 1. 

 Terebella figulus, Daly ell, Pow. Creat. ii. 191. pi. 27. f. 1, 2, and pi. 28. 

 f. 1, 2. 



Hab. The coralline region. 



Obs. "Body orange-red, with about 120 approximate articulations 

 furnished with small fasciculi." — Montagu. The branchise are 

 rather small and arbuscular, with somewhat secund divisions inclined 

 inwards. The tentacula are few and unspotted, capable of being 

 extended to a greater length than the body. The head is pale, 

 without any peculiar appendage, but marked behind the margin with 

 a dark transverse line, composed, apparently, of minute dots. The 

 orange colour of the body is best defined on the ventral aspect. The 

 sternal belt is white, composed of about seventeen narrow transverse 

 segments, which are not narrower posteriorly. Phosphorescent. 



Montagu says, " Its case or tube is unknown." Sir J. G. Dalyell 

 says, " Where circumstances allow, it selects soft mud or clay ex- 

 clusively for the materials of its dwelling, which also is fashioned of 

 a tubular form, heavy, thick and clumsy." The specimen under 

 observation was found detached from its tube, nor could I appro- 

 priate any one of the many in the basin to it ; it had lost the greater 

 part of the abdominal portion. 



(a) Berwick Bay, Br. Johnston. 



(b) Barmouth, Merionethshire, C. Stokes. 



(c) No locality. 



7. T. venustula, "with orange-red body, thickly and minutely 

 marked with white spots." Length 3-4". 



Terebella venustula, Montagu in Linn. Trans, xii. 344. pi. 13. f. 2. 

 Hab, The coralline region, in old shells. 



