EXPLANATION OF PLATE XIX. 



WORM BURROW, p. 311 



1. View of an individual of average size. 



Tinton Beds; Beers Hill Cut, (/-?p 8 ). 



SERPULA WHITFIELDI n. sp., p. 308 



2. View of the type specimen, illustrated by Whitfield as Diplo- 



concha cretacea. 



Navesink Marl. 



HAMULUS ?? sp., p. 311 



3. View of the internal cast. 



4. View of a squeeze showing the external characters. 



Wenonah sand; near Crawfords Corner, (/p6 3 ). 



SERPULA CIRCULARIS n. sp., p. 307 



5-6. Two views of the type specimen. 



Marshalltown clay-marl; near Swedesboro (/77). 



HAMULUS LINEATUS n. sp., p. 310 



7. View of the specimen selected as type. 



Merchantville clay-marl; Lcnola, (/6y). 



SERPULA ROTULA (Morton), p. 308 



8-9. A sinistral and dextral specimen from the upper surface. 

 10. A sinistral specimen from the under side, showing the point 

 of attachment. 



Vincentown limesand; Vinccntown, (154}. 



HAMULUS FALCATUS (Conrad), p. 309 



11-12. Views of two different individuals illustrated by Whitfield. 

 Navesink marl. 



918 



