EXPLANATION OF PLATE XXIII. 



Figure 125. — Crucibulum striatum, (p. 651 ;) natural size. 

 126. — The same ; side view. 

 127. — Crepidula plana, (p. 650 ;) natural size. 

 128. — C. convexa, (p. 650 ;) natural size. 

 129. — C. fornicata, (p. 649 ;) natural size. 

 129a. — The same; young specimen. 

 130. — Neverita duplicata, (p. 646 ;) natural size. 

 131. — Lunatia immaculata, (p. 646 ;) natural size. 

 132. — Natica pusilla, (p. 647;) slightly enlarged. 

 133. — Lunatia heros, (p. 646 ;) natural size. 



134. — The same ; with the animal extended, as in crawliug ; dorsal view. 

 135. — The same, variety triseriata, (p. 354 ;) young, natural size. 

 136. — The same variety ; natural size, lower side. 



(From Einney's Gonkl, drawn by E. S. Morse.) 



