PLATE XXXIV. 



These figures are from unpublished drawings by the late Dr. "William Stimpson. 



Fig. 1. Olivella mutica Say ; a-g, varieties of form and color, natural size ; 

 h, operculum, natural size ; i, I, operculum outside and inside, mag- 

 nified ; m, animal crawling ; n, head, showing absence of eyes and 

 tentacles ; o, section of oral aperture, magnified ; p, penis ; r, sec- 

 tion of shell showing absorption of internal walls. Page 133. 



" 2. Olivella mutica Say ; dentition. Page 133. 



3. Purpura floridana Conrad. c, animal from below, natural size ; 

 d, head and verge from above. Page 217. 



" 4. Purpura floridana Conrad ; dentition. Page 217. 



" 5. Scaphclla junonia Hvass. b, shell one half natural size ; c, sculpture 

 of early whorls ; d, nucleus ; e, section of shell. Page 148. 



" 6. Volutomitra gronlandica Beck. Young shell and magnified nucleus. 

 Page 145. 



" 7. Volutomitra gronlandica Beck. Rhachidian tooth; a, from above; 



b, in profile. Page 145. 



" 8. Oliva litcrata Lamarck, a, animal crawling, f ; b, tentaculaand eyes ; 



c, soft parts removed from the shell, showing (/) foot, (7) propo- 

 dium, (h) respiratory siphon, (?) vent, (I) posterior filament of 

 mantle, (m) mantle raised up, (ji) verge, (0) gill ; d, section of muz- 

 zle showing proboscis extruded ; e, gill and sensory organ (osphra- 

 dium). Page 133. 



" 8. Oliva litcrata Lamarck. Dentition taken from a female specimen. 

 Page 133. 



