New Orders and New Families in the Class Echinodermata. 229 



I would say each arm possessed six or more armlets. Notwithstand- 

 ing the specimens are in a good state of preservation, there is no evi- 

 dence of the existence of pinnules, 'beyond a finely serrated edge, as if 

 the ambulacral furrow had been protected by very short, fine cilia. 



The azygous side is not shown by any specimen, in such condition 

 as to justify a definition, and but one specimen shows any part of the 

 proboscis, and it exposes only enough to prove the existence of that 

 part. 



I collected this species in rocks of the age of the Upper Helderberg 

 Group, at Deput}', Indiana. 



The specific name is in honor of Henry Nettleroth, of Louisville, who 

 has done so much to make known the fossils of the Devonian rocks of 

 that locality, and who is the author of the "Fossil Mollusca of Ken- 

 tucky," in volume 1 of the Palaeontolog}' of that State, which is now 

 in press. 



Lichenocrinus tuberculatus, S. A. Miller. 



[Plate IX., fig. 6, three specimens on a shell, natural size; fig. 6a, a magnified view of one 

 of these, showing the upright lamellae in the body cavity.] 



[Lichenocrinus tuberculatus, S. A. Miller, 1874, Cincinnati Quarterly 



Journal of Science, vol. 1, p. 346.] 

 The specimens illustrated, I collected at an exposure of the extreme 

 upper part of the Hudson River Group, about three miles south of 

 Osgood, Indiana. They are large, and show the interior better than 

 any I have hitherto seen. The crenulations on the upright lamellae, 

 shown in the magnified view, fig. 6a, are due, probably, to mineralization, 

 and do not represent a character of the genus. The upright lamella? 

 radiate from a central apex, or little sharp node, which has an ap- 

 pearance something like the apex of a Crania Icelia. This is placed 

 immediately below the perforation of the column, and seems to set at 

 rest the question as to a central opening on the under side. There is 

 no such opening. The specimen- which Prof. Meek examined, and 

 which caused him to suggest the possibility of such an opening, 

 evidently presented some defect instead of an opening. 



Lichenocrinus affinis, n. sp. 



[Plate IX., fig. 7, natural size ; fig, 7a, magnified view.] 



This species is small, and very much resembles L. crater •iformis. 

 It is circular, discoid, crateriform, and composed of irregular, poly- 

 gonal, slightly convex plates. These are smaller at the periphery, and 



