104 Mr. Tate on the Geology and Archoeology of Beadnell. 



marine worms which creep in a serpentine manner, and even 

 swim by successive undulations of their bodies or by agitating 

 their appendages. 



CRASSOPODIA EMBLETONIA,* (TaTE.) Plate I., fig. 1. 2. 



Length unknown (upwards of two feet) ; width one inch ; 

 thickness not exceeding four lines; width of body five 

 lines ; articulations three lines apart ; cirri about four lines 

 long, crowded, there being twenty-four in the space of one 

 inch. There is no appearance of a head ; the width and 

 characters are the same throughout the entire length; it 

 occurs in large rounded loops from half an inch to more than 

 three inches apart. 



Having found sections shewing the interior of this curious 

 fossil, I have been able to determine the width of the body, 

 and the distance of the articulations from each other. 



This is the most widely distributed of the carboniferous 

 annelids ; it occurs in sandstones of the mountain limestone 

 at Beadnell, Scremerston, Howick, Haltwhistle, on the Irthing 

 near Combe Crag, and also in flaggy beds of the millstone grit 

 at Berlin Carr, between Alnmouth and the Coquet. 



Fig. 1. — Upper surface ; the keel-like centre is that por- 

 tion of the body not covered with cirri. 



Fig. 2. — Section shewing the articulations of the body; 

 a, intestinal canal ; 6, muscular layer and articulations ; 

 c, space occupied by cirri. 



CROssopoDiA MEDIA, (Tate.) Plate I., fig. 3. 4. 



Length considerable (upwards of three feet nine inches), 

 usual width about four lines, but some specimens are only 

 three lines and others as much as six lines wide ; thickness 

 three lines ; width of body two lines ; length of cirri one line 

 and a half, and twenty of them in the space of one inch ; the 

 width and thickness continue the same throughout the entire 

 length. It occurs in irregular loops and long undulations which 

 occasionally cross each other. 



This is quite distinct from the C. Embletonia, being much 

 smaller and much thicker in proportion to its size ; the cirri 

 are less crowded and the foldings are more tortuous and ir- 

 regular. 



It occurs in sandstone at Beadnell, abundantly at North 

 Sunderland, at Newton-on-the-Moor, and at Howick. 



Fig. 3. — Upper surface. 



Fig. 4. — Section shewing the cirri and a cast of the body. 



* I have named this after my esteemed friend Mr. R. C. Embleton, the ac- 

 complished Secretary of our Club. 



