194 BULLET N 37, UNITED STATES NATIONAL MUSEUM. 



PLATE L. 



Fig. 1. Purpura lajnllus Liun^. 



2. The same ; a younger specimen. 



3. The same; ovicapsules enlarged about four times. 



4. Chrysodomus {Sipho) pygmwus Gould. 



5. Scala mullistriata Say. 



6. Urosalpinx cinereus Say. 



7. Nassa iriviUata Say. 



8. Nassa viiex Say. 



9. Nassa (Ilyanassa) odsoleta Say. 



10. Scala Sayana Dall ; 17.0. 



11. Eupleura caudata Say, small northern form. 



12. Anachis avara Say, variety. 



13. Astyris pura"^ YcviiU; (4. 2^onaKs Liusley, uoa Verrill). 



14. Mangilia'? plicosa C. B. Adams. 



15. Mangilia^ Mcarinala Couthouy. 



16. Astyris lunata Saj'. 



17. Bela liarpuJaria Couthouj', , 



18. Lunatia triseriaia Say ; young. 



19. The same; older specimen. 



20. Lunatia immaculata Totten. 



21. Natica pusilla Say. 



22. Ccecum pidchelliim Stimpson. 



23. Crepidula fornicata Lamarck. 



24. The same; young specimen. • 



25. Crepidula convexa Say. 



26. Crepidula {ungidforviis Lam. var. ?) plana Say. 



27. Crucihulmn striatum &aj • profile. 



28. ^he same, from below. 



Except where otherwise indicated the figures are of natural size. These figures 

 were drawn by E. S. Morse, were first published in Mr. W. G. Binney's edition of 

 Gould's Invertebrata of Massachusetts, and were loaned on the present occasion by 

 the U. S. Fish Commission. 



PLATE LI. 



Fig. 1. Lunatia heros Say, showing animal crawling. 



2. Acmcea testudinalis Linn6, profile. 



3. The same, from below. 



4. Vermicularia spirata Philippi. 



5. Lilorina palliata Say. 



6. Litorina rudis Maton, 



7. Acmcea testudinalis var. alveus Couthouy, profile. 



8. The same from below. 



9. Trachydermon ruier Linn^. 



10. Chaetopleura apiculata Say. 



11. Lunatia heros Say. 



12. Neverita duplicata Say. 



The same remarks apply to these figures as to those included in Plates L, LII, and 

 LIIL 



