23 

 Cryptonymtjs ornatus. H. and W., 1875. 



Syn. Cybele punctata, Hall, Pal. N. Y., Vol. II, P. 297. 

 Encrinurus ornatus. Hall, Geol. Ohio, Vol. II, P. 154. 



The cephalic shield is semilunar orsubcrescentiform, 

 with the posterior angles extended into long spines. 

 Gabella clavate, not lobed ; surface of the glabella and 

 cheeks tuberculated. Thorax composed of 11 segments. 

 Pygidium triangular ; as wide, or a little wider than 

 long. The axis forms less than I of the entire width, is 

 strongly marked and somewhat flattened on the top, ex- 

 cept at the anterior portion ; it has about 20 or more 

 segments ; the centre is marked with a row of five prom- 

 inent tubercles, the anterior one of which is situated 

 on the 2nd ring, the next on the 5th ; the others have 3 

 rings between each tubercle. Seven well defined pleurse 

 exist in the Ohio specimen, and they are all directed 

 backwards, gradually decreasing in size ; each pleurse 

 appears to have been marked near the dorsal furrows 

 with a node, and also with two or more other nodes 

 further out on the pleurse. 



A specimen of a pygidium represented on pi. Ixvi, 

 fig. Ig, Pal. N. Y., vol. ii, shows a row of four tubercles 

 on the centre of each pleursB. 



Steinhart figures in his work on the Trilobites of 

 Prussia, pi. iv, fig. 15, a triangular pygidium of '^rypt. 

 punctatus with 20 axal notches and 5 nodes. This speci- 

 men has 7 pleurae, and also latteral tubercles ; each 

 pleurse being marked at its base with a prominent tu- 

 bercle. We know of no species belonging to this section 

 which has a central row of tubercles along the pleurse 



