PROTOZOIC ANNULATA. 179 



worm which he saw in the rockj and of which the specimen de- 

 scribed is a part, measured a yard in length_, without signs of 

 tapering or alteration of character, thus agreeing in proportion 

 with its hving alhes. Its great width easily distinguishes it from 

 the older C. Scotica (M'Coy), and it has no resemblance to any 

 other fossils I know of. The piece described is about 4 inches 

 long, and is gently flexuous. 



Tilestone (Upper Ludlow) of Storm Hill, Llandeilo. 



(Col. University of Cambridge.) 



Ct'ossopodia Scotica (M*^Coy). 



Sp. Char. Length unknown (upwards of 3 feet), width nearly 2 

 lines, width of body (and trail on the surface of the beds) one- 

 third of a line ; cirri very fine, close, delicate, about five in the 

 space of 1 line. 



This interesting worm is closely allied to the so-called Nereites 

 Loomisii of Prof. Emmons's ' Memoir on the Taconic System,' 

 t. 3. f. 3, from the taconic slates of Waterville, Maine. The 

 American species certainly belongs to our new genus Crossopodia, 

 but, if correctly drawn, has much thicker and fewer feet. The 

 narrow deep t7'ail of the middle part of the body on the upper 

 surface of the planes of deposition of the slate, and the narrow 

 cord-like ridge formed by the casts in them on the under surface 

 of the laminae, might possibly be mistaken for a different worm 

 resembling a Gordius, without due caution or the absolute de- 

 monstration of their nature, aff'orded by many of the specimens. 

 Very abundant in the greenish slate of Thorney Lee quarry, 

 on the Tweed, near Inverleithen. 

 {CoL University of Cambridge.) 



Trachy derma? Icevis (M^Coy). 



Sp. Char. Tube slightly curved, thin, coriaceous, slightly taper- 

 ing, subcompressed j slightly more than 1 line in diameter at 

 the broad end, and slightly less than 1 line at the imperfect 

 smaller end of a specimen 1 inch 7 lines long ; surface nearly 

 smooth. 



The specimen is a brown, tough, flexible tube, irregularly and 

 gently compressed (parallel to the plane of stratification of the 

 rock), assuming an oval section ; and being filled with the bright- 

 coloured matrix shows clearly the thinness of the tube, which, 

 from the same cause, has a few irregular indentations of the sur- 

 face, which otherwise seems smooth. 



Rare in the fine beds of Caradoc sandstone of Acton Scott, 

 Church Stretton. 



[Col. University of Cambridge.) 



m2 



