1917] The Ottawa Naturalist. 99 



Description of Fossils. 



Streptelasma rusticum (Billings), Fig. 1. Coralla frequently 

 strongly curved as in the specimen figured, but in some individuals the 

 curvature is only moderate. Occurs in the cherty Richmond and in 

 the immediately underlying part of the more argillaceous Richmond. 

 Small specimens of Streptelasma (Fig. 2) occur also 10 feet below 

 the cherty Richmond, immediately above the Pholadomorpha pholadi- 

 formis zone. These specimens have a general resemblance to 

 Streptelasma divaricans (Nicholson), especially such forms as occur 

 in the upper part of the Liberty formation in various parts of Clinton 

 county, Ohio, the attachment of the corallum being more or less 

 lateral, frequently with somewhat radicular expansions. 



Cornidites corrngatus (Nicholson). Specimens resembling 

 figure 27 on plate 115 of the Palaeontology of New York, volume VII, 

 Supplement, occur in the cherty Richmond. 



Lichenocrinus tuber cidatus Miller, Fig. 3. Specimens with the 

 plates not as prominently convex, and therefore not presenting as 

 tubercular an appearance as typical forms of the species, occur in the 

 cherty Richmond. The part here figured forms the attachment disk 

 at the basal part of the stem of a crinoid probably belonging to the 

 Heterocrinidae (Scyphocrinus and its bulbous root Camarocrinus, 

 Springer, 1917, page 11). 



Perenopora decipiens (Rominger) and Rhombotrypa quadrata 

 (Rominger) are common in the upper part of the argillaceous Rich- 

 mond, within ten feet of the cherty Richmond. Proboscina aidoporoides 

 (Nicholson) occurs in the cherty Richmond. 



The specimens of Crania occurring in the upper part of the 

 argillaceous Richmond are more or less granulose, but the granules 

 are only about a tenth of a millimeter wide and the distances between 

 them average from one-fifth to one-fourth of a millimeter. In outline 

 they are more or less irregular, as in Crania scabiosa (Hall). The 

 diameters of one specimen are 11 and 13 millimeters respectively. 



Dalmanella jugosa subplicata, var. nov., Figs. 4, A, B, C. 

 Specimens resembling the forms figured are common in the upper part 

 of the argillaceous Richmond. Compared with Dalmanella jugosa 

 (James), from the Waynesville formation of southern Ohio and 

 neighboring states, they show a tendency toward low folds correspond- 

 ing to the more prominent fascicular areas among the radiating striae, 

 especially in case of the pedicel valve. The median depression of the 

 brachial valve tends to be narrower, with the immediately adjoining 

 low folds on each side forming a less divergent angle. The term 

 Dalmanella meeki was proposed by Miller (Cincinnati Quarterly 

 Journal of Science, 1875, page 20) for specimens described and 

 figured by Meek (Ohio Palaeontology, vol. I, 1873) and which Meek 



