255 



EXPLANATION OF PLATE 28 

 Figure Page 



199. Cerithidea oostata (da Costa) 143 



200. Cerithidea scalarifomiis Say 144 



201. Cerithidea costata turrita Stearns 143 



202. Bittiam variuin (Pfeiffer) 144 



203. Strombus pngilis alatus Gmelin 145 



204. Strorabns pngilis alatus Gmelin 145 



Smooth shoulder, no tubercles. 



205. Sirania uniplicata (Sowerby) 147 



206. Trivia pediculus (Linne) 148 



207. Erato maugeriae Gray 148 



Fig. a. Exterior view. Fig. b. Interior view. 



