Cl. VI. SABELLA. CONCRETE-SHELL. 371 



Found in muddy bottoms above low-water 

 mark. Animal, a Terebella. 



Mont. Test. Br. 552. 8. areWarta* 



* S. with a cylindric tube, extremely brittle, 

 composed of fine sand ; length from one to two 

 inches, and about the size of a raven's quill. 

 Animal unknown. 



Mont. Test. Br. 552. g. subcy- 



LINDRICA. 



* S. with a slender, fragile, subcylindric tube, 

 composed of fine sand, and minute particles of 

 shells, cemented together on a fine membrane ; ^i,-; 



length from one to three inches ; diameter not 

 above one tenth of an inch. Animal unknown. 



Mont. Test. Br. 553. 10. setifor- 



MIS. 



* S. with a slender tube, tapering at the smaller 

 end to one half of the larger end, composed of 

 particles of shells and stones, placed in an im- 

 bricated manner ; length three or four inches ; 

 size double that of an hog s bristle. Animal 

 unknown. 



g. B 2 



