342 Mr. MonfTACv's Descriptions of 



inches in length : the three pair of branchiae are much ramified, 



and re.d. 

 Length sixteen inches. 

 Inhabits the Devon coast, but is very rare. 



T. gigantea is the largest of the discovered species ; it inhabits 

 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. 



J Spec. 2. Terebella cirrhata. 

 Tab. XII. Fig. 1. 

 T. with eleven oval dorsal plates on the anterior articulations. 

 Body long, with numerous orange-coloured articulations, fur- 

 nished with small peduncles, and at the anterior end with fas- 

 ciculi of bristles : branchiae large and red : mouth with a frill- 

 like membrane beneath, and ciliated above. Capillary appen- 

 dages four or five inches in length. 

 Length nearly twelve inches. 

 Diameter near the head half an inch. 



The tube (which is described in Testacea Britannica under the 

 name Sahella cirrhata) is very fragile; it is composed of sand and 

 clay, and is lodged in the ground, with half an inch projecting 

 above the surface. 



This species is gregarious, and is not uncommon on the south- 

 ern coast of Devon. 



Spec. 



