194 BULLET N 37, UNITED STATES NATIONAL MUSEUM. 



PLATE L. 



FlG. 1. Purpura lapillus LUIIH'. 



2. The same ; a younger specimen. 



3. The same; ovicapsules enlarged about four times. 



4. Chrysodomw (Sipho) pygmwus Gould. 



5. Scala multixtriata Say. 

 '6. Uroxalpinx cinerens Say. 

 7. Nti8na trivittatn Say. 



S. Nawa vibex Say. 



9. N<i8na ( Uyanassa) obsoleta Say. 



10. Scala Sayana Dall; 17.0. 



11. Euuleura caudata Say, small northern form. 



12. Anacliis avara Say, variety. 



13. Axtyris pural Verrill ; (A. zonalis Linsley, non Yen-ill). 



14. Manyilial plicosa C. B. Adams. 



15. Mangilia ? bicarinala Couthouy. 



16. Astyriit lunata Say. 



17. Bela harpularia Conthony. 



18. Lunatia triseriata Say ; young. 



19. The same, ; older specimen. 



20. Lunatia immaculata Totten. 



21. Natica puailla Say. 



22. Caecum pulchellum Stimpson. 



23. Crepidula fornicata Lamarck. 



24. Thesa'iie; young specimen. 



25. Crepidula convexa Say. 



26. Crepiduln (unguiformis Lam. var. 1) plana Say. 



27. Crucibulum slriatum Say ; profile. 



28. The 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. Biuney'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. Aomeea testudinalis Liune", 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 tuber Linne". 



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 



