EXPLANATION OF PLATE XXI. 



FiGur.E 106. — Pleurotoma bicariuatum, (p. 638 ;) natural size. 

 107. — Bela i')licata, (p. 637 ;) natural size. 

 108. — Bela harpnlaria, (p. 636 ;) natural size. 

 109. — Anachis similis, (p. 644 ;) natural size. 

 110. — Astyris lunata, (p. 645 ;) enlarged. 

 111. — Astyris zonalis, (p. 645 ;) enlarged. 

 112. — Tritia trivittata, (p. 641;) natural size. 

 113. — Ilyanassa obsoleta, (-p, 641 ;) natural size. 

 114. — Nassa vibex, (p, 640 ;) natural size. 

 115. — Neptunea pygrasea, (p. 639 ;) natural size. 

 116. — Urosalpinx cinerea, (p. 641 ;) natural size. 

 117.— Eupleura caudata, (p. 642 ;) natural size. 

 118. — Purpura lapillus, (p. 642 :) natural size. 

 119. — The same ', banded variety. 

 120. — The same ; egg-ciipsules, enlarged one-third. 

 121. — Buccinum undatum, (p. 638 ;) natural size. 

 122. — Scalaria multistriata, (p. 660 ;) enlarged. 

 123. — Scalaria lineata, (p. 660 ;) enlarged. 



(Figure 120 was drawn from nature by J. II. Eiucrtou ; the rest arc i'rom Liuney's GouUl, drawn by 

 E. S. Morse.) 



