five British Species of Terebella. 343 
Spec.3. TEREBELLA NEBULOSA. 
: Tas. XII. Fie. 2. 
T. with its body spotted with white, having thirteen dorsal plates, 
Body long, orange-red, spotted all over with white. Anterior 
extremity very tumid, defended by the dorsal plates: anterior 
peduncles very small, with the fasciculi pointed. The other 
peduncles and fasciculi are broad. The posterior end is ab- 
ruptly smaller than the other, as if it had been lost by acci- 
dent, and afterwards reproduced. | The capillary tentacula are 
numerous, and of a pale orange-colour spotted with white. - 
Branchiæ red with white spots. 
Length six or seven inches. — 
Diameter of the largest part half an inch. . j 
Inhabits the southern coast of Devon rarely, being taken only by 
deep dredging. Its case is composed of slimy matter, covered 
with gravel and broken shells. 
Spec. à. TEREBELLA CONSTRICTOR. 
; | LAR III. Fio. 1. 
T. with twelve broad plates on the back: capillary appendages 
i pale. 
Body orange-red, with about one hundred and twenty approxi- 
mate articulations furnished with small fasciculi ; those behind 
the dorsal plates are divided down the middle by a sulcus: 
mouth with an expanded lower lip, surrounded with capillary 
appendages longer than the body. _ 
Length three or four inches. 
Inhabits the coast of Devon, and is rare. 
The very closely-connected articulations discriminate this spe- 
cies from any of the others. Its case or tube.is unknown. 
Spec. 
