ADDENDA AND CORRIGENDA. 343 



Page 197, loida macrophthalma, for Plate XIV. read Plate 

 XIV. a. 



Page 210, Cirratulus tentaculatus, after {a) South Devon, 0. Mon- 

 tagu, add (b) Falmoutli, W. P. CocJcs; (c-g) Polperro, Cornwall, 

 Laughrin. 



Page 212, Cirratulus borealis, after (a) South Devon, G. Montagu, 

 add (b) Falmouth, W. P. CocJcs ; (c, d) Berwick, Dr. Johnston ( = Cir- 

 ratulus ^avescens, JoJinst.) ; {e-k) Polperro, Cornwall, Laughrin. 



Page 212. Introduxe here, before Genus DODECACERIA, 

 Genus AONIS, Savigny {Aud. 6f Edw.). 



Tentacle one, or none ; tentacular cirri wanting ; setiferous pro- 

 cesses of aU the segments similar, two-rowed ; branchiae short, lancet- 

 or tongue-shaped. — Grube. 



Sp. 1. Aonis vittata. 



Aonis vittata, Grube, Famil. der Atineliden, p. 69. 

 One median tentacle ; branchiae Ungulate, at first leaving the 

 greater part of the back free, wrinkled on the outer margin, after- 

 wards gradually lengthening and becoming filiform. — Grube. 

 Hub. Scotland and England. 



(a) Loch GoU Head, Firth of Clyde, D. Robertson. 



(b) Polperro, Cornwall, Laughrin. 



Page 214, before Tribe II. LIMIVORA, introduce 



Family CH-ffiTOPTERID^. 

 Body vermiform, somewhat cyHndrical or depressed, consisting of 

 several diiferently formed divisions, which are again subdivided into 

 segments. Head-lobe fiat and short, with two tcntacula on the 

 underside. Buccal segment fm-nished with pinnules. Mouth directed 

 forwards ; trunk (proboscis) wanting. Lateral processes of the seg- 

 ments consisting of simple pinnules armed with a row of flat bristles, 

 but not present on all the segments. — Grube. 



Genus CHiETOPTERUS, Cuvier. 

 As there is only one British genus belonging to this family, the 

 characters given above will suffice. 



Sp. 1. Chsetopterus insignis. 



Chsetopterus insignis, Baird, Trans. Linn. Sac. xxiv. 477. tab. xlix. 

 f. 1 & 2. 



Anterior portion of the body square-shaped, broad, flattened, or 



somewhat convex on the ventral surface and sUghtly concave on the 



