344 ADDENDA AND CORRIGENDA. 



dorsal; composed of 11 segments. Tentacula long and channeled. 

 Fourth segment of anterior portion of body broader than the others, 

 and furnished on the ventral surface with a row of stout black 

 setae. The feet of the 10th segment are long and lanceolate-shaped. 

 Middle portion of body cylindrical, and composed of four segments, 

 which are in the form of sacs or vesicles. The posterior portion of the 

 body consists of from 13 to 23 segments, which gradually diminish 

 in size as they descend, the last 6 or 8 being very small and closely 

 crowded together. The animal inhabits a thin parchment-like tube 

 coated externally with sand and gravel. 

 Hah. Coasts of Great Britain ; Channel Islands, 

 (rt) Island of Guernsey, Mrs. Manger. 



(b) Island of Herm, Channel Islands, /. Smith. 



(c) Cumbrae, Firth of Clyde, D. Robertson. 



(d) Polperro, Cornwall, Laiighrin. 



(e) Fahnouth (tube only), W. P. Oochs. 



(/) Herm, Channel Islands (tubes), J. Smith. 



(f/) Beaumaris, Isle of Anglesey (animals and tubes), J. Williams. 



Ohs. The true place in the systematic arrangement of Annelides 

 for the family Cho'.topteridce has been much misunderstood. Oersted 

 some years ago divided the large family Ariciidce into two sections, 

 Avhich he has distinguished by the names of Arii:ea> vera; and Aricexe 

 Naidece. Sars and other more recent authors consider that these two 

 sections ought to be raised to the rank of distinct families ; and they 

 may be called Aridido' (s. str.) and Spionidce. 



Between these two famihes Cams has more recently still arranged 

 the family Cluet opt er idee ; and certainly the animals belonging to this 

 family have much more analogy with those of the Spionidce than 

 with any other group of Annelides. In the present Catalogue, how- 

 ever, it has been considered sufficient to introduce the family Chce- 

 topteridoi (now for the first time made known as British) in its 

 present place, at the end of the Ariciidce, before the commencement 

 of the Tribe Limivora. (For a more complete view of the reasons 

 for assigning the place for the Cha'topterid<e close to the Aricece, see 

 paper in Trans. Linn. Soc. xxiv. pt. 3, 1864.) 



Page 217, Ophelia acuminata, after (b) Cullercoats, J. Alder, &c., 

 add (c) Cumbrae, Firth of Clyde, D. Robertson. 



Page 221, TraAisia Forbesii, after description o/ Plate XIX. add 

 (rt, b) Cumbrae, Firth of Clyde, D. Robertson. 



Page 223, Siphonostoma uncinatum, after (a) Tenby, S. Wales, 

 F. D. Dyster, add (b) Cumbrae, Firth of Clyde, D. Robertson. 



Page 231, Arenicola piseatorum, after (</) Berwick Bay add (h-j) 

 Holy Island, Br. Johnston ; (/•) Cumlirae, Firth of Clyde, D. Robert- 

 svii; (1) Polperro, Cornwall, L((ii</hri)i. 



