DEVONIAN SPECIES. 25 



the projecting ends of the pk^urre, 2.40 inches; length of wliat remains 

 of the pygidium, 1.03 inches; breadth of the same, about 1.80 inches. 



Supposing it to be a true Paradoxides, with not less than sixteen thoracic 

 segments, the entire specimen, when complete, could not have been far from 

 six inches in length. It can hardly be a true Paradoxides, however. 



It is possible I should call this species Olenus or ParaboUna Nevadensis; 

 bat its large size seems to be an objection to placing it in any section of 

 either of these groups. In the possession of a node, or spine, on each of the 

 thoracic segments, as well as in the direction of the jiosterior segments of 

 the lateral lobes of the pygidium, it agrees with the type of ParaboUna; but, 

 unfortunately, the specimen is not in a condition to show whether or not 

 these segments of the pygidium terminated in produced marginal spines, 

 while the furrows of its pleurae have not the obliquity of those seen in that 

 type, but agree more nearly with those of some species of Conocoryphe. The 

 comparatively lai-ge size of its pygidium, and the nodes, or spines, on its 

 thoracic segments, as well as the nature of the furrows of the pleurae, are 

 rather against its reference to Paradoxides, and lead me to think that it may 

 belong to an undescr'ibed genus; if so, it might be called Olemides. 



Locality and position. — Same as last. 



DEVONIAN SPECIES. 



EADIATA. 

 POLYPI. 



EAVOSITID^. 



Genus ALVEOLITES, Lamarck. 

 Alveolites multilamella, Meek. 



Plate 2, figs. 7, 7 a, and7i. 



Corallum massive, apparently hemispherical, or subglobose. Calices 

 very small, or uniformly only about three-hundredths of an inch in their 

 greater diameter, and about half as much in their smaller diameter ; as 



