PLATE 64 



1. Olivella mutica Say. a-g, varieties of form and color; h, operculiim; 



1, 1, operculum outside and inside, magnified; m, animal crawling; n, head, 

 showing absence of eyes and tentacles; section of oral aperture magnified; 

 p, sexual organ; r, section of shell showing absorption of walls, p. 132. 



2. Olivella mutica Say. Portion of radula. p. 132. 



3. Thais floridana Conrad. c, animal from below; d, head from above, p. 117. 



4. Thais floridana Conrad; radula. p. 117. 



5. Maculopeplum junonia Chemnitz, b, shell; c, sculpture of early whorls; 



d, nucleus; e, section, p. 128. 



6. Volutomitra groenlandica Beck. Young shell and magnified nucleus, p. 129. 



7. Volutomitra groenlandica Beck. Rhachidlan tooth; a, from above; b, in pro- 



file, p. 129. 



8. Oliva sayana Ravenel. a, animal crawling; b, tentacles and eyes; c, soft 



parts removed from shell, showing (f) foot, (g) propodium, (h) breathing 

 siphon, (i) vent, (l) posterior ligament of mantle, (m) mantle raised up, 

 (n) verge, (o) gill; d, section of muzzle; e. gill and sensory organ, p. 131. 

 8g. Oliva sayana Ravenel. Dentition from female specimen. These drawings were 

 made in 1889 by Dr. .William Stimpson. p. 131. 



