247 



EXPLANATION OF PLATE 24 

 Figure Page 



165. Natica canrena (Linne) 123 



Fig. a. Operculum. Fig. b. Front or apertural view. 



166. Natica pusilla Say 124 



167. Polinices dnplicatns (Say) 124 



168. Sinnm perspcctivum (Say) 125 



169. JUarsenina gloljosa L. Perry 127 



Copy Perry, Nautilus, 1939. 



170. Xeiiophora conchj liopliora (Born) 128 



Basal view with Chione cancellata attached. 



171. Calyptraea centralis Conrad 129 



Fig. a. Lateral view. Fig. b. Basal view. 



172. Crucibulum striatum (Say) 129 



