666 C. CALLAWAY ON A NEW AREA OF UPPER 



Thorax of 13 rings ; axis about J the width of the body, each 

 ring rising into a nodule at the sides ; pleurae, fulcrum nearly half- 

 way out, grooved almost to the ends, which are rounded. 



Tail small, entire, axis reaching nearly to the margin. 



This species closely resembles C. striata, Emmr., of Barrande's 

 " Primordial Zone." 



Prom the Shineton Shales at Shineton. Common. 



Olentjs, Balm. 



Olentts Salteri, Call (Plate XXIV. fig. 5.) 



(Conocoryphe) Quart. Journ. Geol. Soc. vol. xxx. p. 196. 



Head wider than body, transversely oval, with short curved spines 

 at two thirds from the front, margined by a narrow furrow ; glabella 

 ovate, wider than fixed cheeks, nearly reaching the front margin, 

 with two pairs of lateral furrows ; facial suture as far out behind 

 as the ends of the pleurae, but in front cutting the margin a little 

 outside of the anterior prolongation of the sides of the glabella ; 

 eyes forward, submedian, roundish oval, prominent, distinctly show- 

 ing the facets ; occipital ring with a spine or tubercle. 



Thorax of 11 (or more) rings, each ring with a tubercle ; axis as 

 wide as pleurae ; pleurae strongly grooved and bent sharply back- 

 ward into points. 



Pygidiwm small, axis of two or three rings, nearly reaching the 

 margin, which is rounded. 



I originally described this as a Conocoryphe, from imperfect ma- 

 terial. 



From the Shineton Shales at Shineton. Common. 



Olenes teiarthrvjs, n. sp. (Plate XXIV. fig. 6.) 



Head wider than body, transversely oval, with curved spines at 

 two thirds from the front reaching back as far as the tail, margined 

 by a deep dotted furrow ; glabella much w r ider than the fixed cheek, 

 subquadrate, shorter than in 0. Salteri, with two pairs of lateral 

 furrows, the hinder pair nearly meeting ; facial suture nearly as far 

 out as the ends of the pleurae behind, in front cutting the margin 

 some distance outside the forward prolongation of the sides of the 

 glabella ; eyes forward, near the glabella ; occipital ring with a 

 tubercle. 



Thorax of 15 (or more) rings ; axis not so wide as the pleurae, 

 each ring with a tubercle ; pleurae grooved to the ends, bent back to 

 a point. 



Pygidiwm short, rounded ; axis of 2 or 3 rings, reaching nearly 

 to the margin. 



This species is easily separated from 0. Salterihj its squarish gla- 

 bella, its long cheek-spines, its narrow axis, and its more numerous 

 segments. In its long spines it resembles Eurycare, Ang. ; but the 

 eyes are not lateral as in that genus. In some points it suggests Tri- 

 arthrus, and is, perhaps, the form which Salter doubtfully assigned 

 to that genus. 



