128 Scientific Intelligence. 
- Crinoidea, Closterocrinus, H., Glyptocrinus, Ichthyocrinus, Caryocrinus, 
Tentaculites; Trilobites, Cybele, Loven, Calymene, Acidaspis, Pha- 
cops, Ceraurus, Beyrichia, M’Coy. eP 
UPPER GRAY SANDSTONE OF THE CLINTON GRouP.—Myalina, Mo- 
diolopsis, Tellinomya, Pentamerus, Leptena, Platyostoma, Orthoceras, 
Homalonotus.—Icththyodorulite. 
4.) Nracara Grour.—Corals, Streptilasma, Polydilasma, H., Cani- 
nia, Conophyllum, H., Diplophyllum, H., Syringopora, Astrocerium, H., 
Favosites, Catenipora, Heliolites, Stromatopora, Cladopora, H., Lima- 
ria, H., Callopora, H., Trema opora, H., Striatopora, H., Stictopora, 
g 3 
Asteriada, Paleaster, H.; Mollusca, Lingula, Orbicula, Orthis, Lep- 
tena, Spirifer, Atrypa, Avicula, Modiolopsis, Orthonota, Posidonomya? 
Platyostoma, Conrad, Acroculia, Phillips, Gomphoceras?, Cyrtoceras?, 
rusta 
to two large quarto volumes, are yet but half finished. We trust that 
there will be no impediment in the way of his bringing his laborious 
and most valuable researches to a full completion. 
Nore.—In a letter to one of the editors, Mr. Hall states that Bar- 
rande has expressed to him his suspicion that the supposed Ichyodoru- 
lite, from the Niagara Group, figured on plate 71, is Crustacean. Mr. 
all observes that he had before Suspected this, and adds that on reéX- 
amimation, the spine proves not to have the structure pertaining tot 
of fishes but rather that of a Crustacean. The articulating extremity 
is also Crustacean and unlike anything that has been seen in the cor- 
responding parts of Ichthyodorulites. Mr. Hall says that we have 
therefore no fish remains, or none of unquestionable character, yet dis- 
covered in this part of the Silurian system. The fragments from the 
Clinton group, which appear to have a bony structure, have not yet 
n examined with a microscope. 
