FROM THE CARBONIFEROUS FORMATION. 167 



view, with both ends drooping but neither perfect, none of the spines and only a few of 

 the legs partially preserved. The length of the fragment as it lies is 33 mm.; if extended 

 it would probably reach 38 mm., and represent the full length, nearly thirty segments 

 being partially or wholly visible. 



All the specimens which I refer to this species come from the carboniferous ironstone 

 nodules of Mazon Creek, Morris, 111. Those which have been personally examined 

 were received from Messrs. Carr, Armstrong, Worthen, Bliss and Pike. 



The species differs from the last mentioned in the somewhat shorter segments and less 

 highly developed spines ; it is besides somewhat smaller ; the spines are longer than in 

 the American species hereinafter mentioned and the shape of the body also differs. 



The Scotch E. Brownii is not improbably distinct from this, but is said to have no spines 

 preserved, removing one of the best sources of comparison ; this, judging from the cast I 

 have, seems to be a mistake, the appendages on the concave side of the body having the 

 appearance of being spines, while those of the convex side are certainly legs. If those of 

 both sides are really legs it presents a dorsal (or a ventral) aspect, and must be considered 

 as distinct from this species because it does not taper to any considerable extent. If it 

 presents, as is far more probable, a side view, like those of the specimens of the present 

 species figured by Meek and Worthen, the spines must be incorrectly drawn in Woodward's 

 figure ; on the cast they appear much stouter than the legs (of the convex side), and 

 appear to be of about the same size as in the present species, but with no basal thorn, or 

 none of any size. 



Euphoberia Brownii Woodward. 



PL 12, figs. 7, 8, 21. 



Eu-plioberia Brownii Woodward, Geol. Mag., VIII, 102-104, pi. 3, figs. 6 a.-c. (1871). 



The single specimen upon which this species was based, gives, according to Woodward 

 a dorsal view of the animal in a slightly curved position ; but judging from a cast which I 

 owe to his kindness, as well as from the features of the animal as figured by him, we must 

 adopt the view that it presents a lateral aspect. Below, i. e. on the convex side, the 

 appendages (legs) are really much longer than those (spines) upon the opposite side, 

 though similarly figured by him, even in an enlarged view (pi. 12, fig. 7, 8) ; and at this 

 same margin, as in figures C and D of Meek and Worthen' s E. armigera, though not to 

 so great an extent, the pair of ventral plates can be seen against the lower edges of the 

 dorsal plates; and on the posteror part of the body, from which Woodward's figure 6 b (pi. 

 12, fig. 7) is probably taken, only the lateral row of spine-bases can be seen. The body is 

 flattened and of very nearly uniform size throughout, a little the largest near the seventh seg- 

 ment and a little tapering posteriorly ; this form would also indicate a lateral view. The 

 body is 90 mm. long and 6.5 mm. broad at greatest. The head is rather broader than the 

 segments behind it, scarcely more than half as long as they, and well rounded, with a con- 

 striction in the middle, giving it the appearance of being formed of two rounded lobes. 

 No appendages can be seen. The segments are stated by Woodward to be thirty-six in 

 number besides the head. They are composed of two equal parts, the anterior forming an 



