182 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



PLATE XVITI. 



Fig. L Scala hellenica var. MorcMana Dall ; 6.b7. 



2. Scala discvholariaDixW ; 6.5. 



3. Acta^on perforatus 'DaW ; 7.75. 



4. Scala aurifil a DaW; 11.0. 



5. Ni^o inteirupta Sowerby var. alhida Dall ; 8.1. 



6. Niso interrupta var. albida Dall, base. ; 3.5. 



7. Jclis nucleala Dall; 9.3. 



8. Jc/is /ato Dall ; 5.5. 



9. Scala contorquata Dall ; 4.7. 



10. Sca/ajjoZacia Dall, aperture imperfect ; 7.25. 



11. Scalaformosissima Ja&cajs; 8.5. The aperture is a little distorted where 



it joins the body whorl. 



11 b. Scala belaurita Dall ; 8.3. 



12. Aclis egiegia Dall ; 13.0. 



PLATE XIX. 



Fig. 1. Bissoa p7-ecipitata D-dU ; 4.0. 



2. Mai ginella fiemin Ilia Dull; 7.0. 



3. Margini'lla Watsoni Dall ; 9.5. 



4. MargiiieUafasiHii Dull; 8.0. 



5. Marginella ijiicatecana Dall ; 5.62. 



6. Marginella succiiiea Conrad ; 12.0. 



7. Marginella torticula Dall; 1L5. 



8. Coliimiella (Anacbis ?) Verrillii Dall ; 9.0. 



9. Pedicularia decussata Gould, profile ; G.O. 



9 b. Pedicularia decussata, young, showing spiral apex; 2.5. 



10. Bissoa xanthias Watson, var. acuticoslata Dall ; 3.7. 

 10 b. Eucosmia brevis Orbigny ; 2.0. 



10 c. Columbella (Anachis) amphissella Dall ; 4.0. 



10 d. Dalium aolidum Dall; 41.0. 



11. Enlima (Melanella) arcuata C. B. Adams ; 4.0. 

 lib. Leiostracafusus Dall; 13.5. 



11 c. Eulimella unifasciala Forbes ; 6.0. 



PLATE XX. 



Fio. 1. Ce7-itMopsis SigsbeeanaDaill; 10.5. 



2. Cerithiopsls Martensii Dall; 11.25. 



3. Cerithiopsis cryslallina Dall ; 16.0. Poor figure. 



4. Eumeta subulata Monlagn ; 14.25. 



5. Cerithiopsis abrupta Watson ; 4.3 



5 a. Triforis triserialis Dall ; 8.25. 



6. Ti if oris cylindrella Dall; 6.5. 



6 a. Triforis triserialis Dall ; 15.5. 



7. Mathilda yueatecaua Dall ; 8.0. 



8. Triforis triserialis var. intermedia Dall ; 11.0. 



9. Triforis abrupta Dall ; 7.5. 



10. Triforis longissima Dall ; 26.0. 



11. Triforis bigemma var. hirciis Dall; 12.5. 

 lib. Triforis torticula Dall; 10.5. 



12. Triforis colon Dall ; 12.0. 



12 b. Triforis inflata Watson var. ibex Dall ; 11.0. 



