PLATE XVII. 



Page. 



Mytilus oblivius Whitfield 64 



Fifj;. 1. Vi(!\v of the only specimen known, natural size. 



LiTllODOMUS AFKINIS Gabli 66 



Fig. 'Z. Lateral view of Mr. Gabb's type specimen, natural size. 

 3. Cardinal view of the same. 



LiTHODOMLS KiPLEYANA Gabb 67 



Fig. 4. Lateral view of a very entire cast of a shell, showing the callus at the posterior end; 

 one of the originals. 

 5. View of a group of the burrows which have been made in wood, from Mullica 

 Hill, N. J. 



MoDiOLA Julia Lea 64 



Fig. 6. Lateral view of Mr. Lea's type, twice enlarged. 



7. View of a specimen irom another locality, natural size, doubtfully referred to this 

 species. Coiiip. M. Julinsoiii. 



MODIOLA BUKLIXGTOXEXSIS Whittield 65 



Fig. 8. Lateral vievif of the type specimen, from Burlington, N. J. 

 9. Cardinal view of the same. 



Crassatella (Etea) PUOiiA Conrad 120 



Fig lO. Lateral view of the type. 

 II. Cardinal view of the same. 



Crassatella vadosa Morton 116 



Fig. lU. Right view of an internal cast. 



13. Cardinal view of the same. 



14. View of a specimen preserving some of the shell substance, showing the concentric 



markings. FVom Freehold, N. J. 

 1.5. Similar view of another specimen from the same locality. 



Crassatella tua.ssveusa Gabb 122 



Fig. 16. Lateral view of the type specimen. 

 17. Cardinal view of the same. 



Crassatella cuxeata Gabb 118 



Fig. Irf. View of a specimen, natural size. 



19 and 20. Views of a ca.st of this species, enlarged to two diameters. 



Crassatella Moxmoutiikxsis Gabb 119 



Fig. 21. View of the right side of a cast of this species, Mr. Gabb's type. 

 22. Similar view of another cast. 



302 



