EXPLANATION OF PLATE XXIII. 



FIGURE 1*25. Crucibulum striatnui, (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. Xeverita duplicate, (p. 646 ;) natural size. 

 131. Lnuatia immaculata, (p. 646 ;) natural size. 

 132.- Natica pnsilla, (p. 647 ;) slightly enlarged. 

 133. Luuatia heros, (p. 646;) natural size. 



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

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

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

 (From Binney s Gonlil, drawn by E. S. Morse.) 



