MARINE MOLLUSKS OF THE SOUTH-EASTERN COAST. 197 



PLATE LIX. 



Fig. 1. Xylotr y a fimhriata Jeffreys; Bhowing sbell, interior and exterior, pallets, and 

 sculpture, enlarged. 



2. Teredo navalis Liuu6; exterior of shell, pallets, and sculpture, enlarged. 



3. Teredo megoiara Hauley ; shell, interior and exterior, and pallets, enlarged. 



4. Teredo Thomsoni Tryon; shell, interior and exterior, and pallets, enlarged. 



5. Thracia mijoims Beck ; Arctic Seas to Cape Cod. 



6. Periploma (Cocltlodcsnia) Leaiia Couthouy. 



7. Periploma fragilis Totten. 



8. GastraneUa iumida Verrill, enlarged. 



9. Thracia iruncata Mighels and Adams; Arctic Seas to New York. 



10. Corhiila contracta Saj'. 



11. Lyonsia hyalina Conrad. 



12. Pholas (Barnca) iruncata Say. 



13. Saxicava arctica Deshayes. 



14. Clidiophora Gonldiana Dall (C. trilineata dould non Say). 



15. Pctricola pIiL^ladiformiii Lamarck. 



For remarks see note under Plate L. Figure 8 was drawn by Prof. A. E. Verrill. 



PLATE LX. 



Fig. 6G. Drilliaf Dalli Verrill & Smith. 



66 a. The same : side view of last whorl, showing anal notch. 



67. PleurotomcUa Agassizii\idVY\\\; adult. 



08. Pleiirotomclla Bairdii Verrill. 



69. Pleurotomella Pandionis Verrill. 



70. Pleurotomella Paclcardi Verrill; var. Beiiidicti Verrill &, Smith. 



70 a. The same; nucleus, showing sculpture of larval or Siinisigcra shell. 



71. Plenrolomclla Jgassizii Verrill ; young. 



71 a. The same; nucleus, showing Siiiusigera sculpture. 



72. Pteurotomella Packardi Verrill ; var. formosa Jeffreys. 



73. Mangilia handclla Dall. 



74. Pleurotomella Emertonii Verrill & Smith. 



The figures on this plate and several which follow were loaned by the U. S. Fish 

 Commission. They first appeared in the Report of the Commissioner of Fisheries for 

 1883, though reduced copies of them had been used to illustrate Prof. Verrill's papers 

 [n the Transactions of the Couuecticnt Academy of Suiences. They were drawn 

 under the supervision of Prof. Verrill for the U. S. Fish Commission by J. H. Emer- 

 tou and others. 



Some of these figures, in a reduced form, reappear on Plates XLIH-XLVI, but as 

 they are rather small there it was thought best to duplicate them by using the larger 

 fignres, since the latter were available. Had all the figures on the reduced scale 

 been available, separately, of larger size, none of the former would have been used; 

 but, after all, the duplication is of little consequence, as, in a general way, it is true 

 that the more good figures there are accessible, the better for students. 



