ADDENDA ET CORRIGENDA. #505 
Page 174. Turso Lacinratus. A series of specimens, recently 
brought from New Caledonia, has shown that the specimen here de- 
scribed is a very young one. The shell grows to be quite large and 
massive, some measuring as much as three by two and a half inches. 
Sometimes the row of spines is double, the lower ones being smaller 
and more numerous than the upper. In older specimens the columella 
loses its rosy tint; the columellar tooth becomes a smooth undulation ; 
the inner and transverse lips advance, so that the aperture becomes 
remarkably hopper-shaped. 
Page 184. Trocuus TAntittus. Margarita angulata, A. Adams, 
Ann. and Mag. of Nat. History, Sep. 1855, seems to be the same 
shell. 
Page 185. Trocuus ticatus. Prof. KE. Forbes has given a descrip- 
tion of this in the Proceedings of the Zool. Society for 1850, p. 271, 
under the name of TJrochus castaneus, Nuttall, MS. In fresh speci- 
mens, there is a violet band just in front of the suture. 
Page 196. LitiopA pecussaTA. The figure referred to should be 
252, instead of 232. 
Page 211. Narica Lewist. This noble shell has since been de- 
scribed as NV. herculea, Middendorf, Beitrage zur einer Malacol. Rossica 
(U849))) m1. 96. pl. 7; fies. 55 6, 7. 
Page 218. There should have been inserted a reference to the 
undetermined species of Pyramidella, probably Obeliscus terebelloides, 
A. Adams, delineated on account of the animal, at Figure 262. 
Page 219. Tricnorroprs pusILLA should precede 7! cancellata, hav- 
ing been accidentally omitted. The following description is copied 
from the Proceedings of the Boston Society of Natural History, iii. 
197 (Apr. 1850). “T. minuta, rhomboideé, umbilico semicirculari 
perforata, albida, striis minutis volventibus cinct&; spira conic, an- 
fractibus 4—5 convexis, ultimo ventricoso et costis elevatis tribus 
cincto; apertur&é semicirculari; columell4 rectéi, ad planitiem labri 
acuti trilobati haud assurgente; umbilico semicirculari. Axis ¢ poll. 
Habitat, crevices of rocks beaten by surf, at Fishtown, Liberia. 
“This curious little shell was also collected by the Exploring Expe- 
dition, probably at the Cape de Verd Islands. No hairy epidermal 
processes appear on any of the specimens; yet I cannot doubt that 
