EXPLANATION OF PLATE LV. 



Mytilus smockt n. sp., p. 502 



1-2. Two views of a complete internal cast which retains some 

 fragments of the shell. 



Xaz-L'siiil: marl: near Walnlurd, (149). 

 3-4. Two views of anolhcr comiilete niternal cast. 



Navcsiu]; marl; near Craiafurds Cnrncr, (uff). 



IMyTILUS oi:L1\IL'S Whitfield, p. 503 



5. The type s|iecnnen illustrated liy Whitfield. 



U'cnanali sand; near Marlboro. 



6. View of tlie internal cast of a left vah-e. 



U'cnanali sand; near Marllwro, (/jO). 

 7-8. A'iews of the internal casts ,-,\ two left valves draihtfully 

 referr(.'il to this species. 



Cliffzaood clay: Cliffiaaod Paint. lio<). 



M0DI0L-\ MONMOUTHliNSIS n. sp., p. SO4 



9-10. \'iews of two left vahes. Liternal casts. 



Mcrchantvillc clay-nnrrl ; near Mataican, tJOl). 



MoDioLA wEXox.\H n. sp p. 507 



II. View of the type specimen. 



Wcnonoh sand: near Marlboro, (i^^o). 



MoDioL.-\ jui,i,\ Lea p. 506 



12-13. Views of two specimens, a right valve and a left valve. 

 U'oodbary elay; LoriUard, UOl) . 



MoDioLA joHNSONi Whitfield p. 509 



14-15. Two vieus, lateral and cardinal, of the type specimen, 

 (After Whitfield.) 



Manasqnan marl; l-'arnungdale. 



MoDioLA ov,\T.\ Gahb p. 50S 



16. Lateral view of a specimen imperfect ]iostcriorly. (After 



Whitfield.) 



17. View of the right side of tlie type specimen. ( .Vfter 



Whitfield.) 



rineenlozan formation ; Timber Cieek. 



MODIOLA BL'RLINGTONENSIS Whitfield p. 50S 



1S-19. Cardinal and lateral views of the type specimen. (After 

 AVhitfield.) 



Merelnnitville elay-marl ; Burlington. 



MoDiii[,,.\ suiiiNFLATA Whitfield p. 507 



20-21. Cardinal and lateral views of the type specimen, (x2). 

 (After \Wlltfield.) 



Jlonierstozan marl; near .Mulliea Hill. 



992 



