86 Aug. F. Focrste 



from Camden. Ohio. It is almost spherical, the vertical diameter 

 being 30 mm., and the transverse diameter nearly 28 mm. Forty- 

 live to fifty plates lie along a line encircling the specimen horizon- 

 tally. The plates usually are hexagonal in outline, and are arranged 

 in crossing diagonal rows, but locally the outline mav be more 

 nearly pentagonal and occasionally five plates may appear to meet 

 at a central point. Five plates occur in a length of 10 mm. along 

 the diagonal lines, varying to 7 in the same length where they are 

 of smallest size. The exposed surfaces of the plates are convex. 

 The nature of the impressions which would be left by these plates 

 upon the matrix filling the cavity of the fossil is unknown. The 

 specimen is not pointed at one end, as though for attachment to 

 some object, as in case of the species Pasccolus Iialli. 



Pasccolus Jialli possesses convex plates bent so as to be slightly 

 depressed towards the angles and elevated toward the sides. Frag- 

 ments of an unknown species of Pasccolus from Anticosti, present- 

 ing, the same form of plates, possess a series of minute granules 

 visible only under a higher magnifier. These granules are arranged 

 in diagonal series diverging on each of the radial elevations, just 

 mentioned, toward the depressed angles of the plates. This orna- 

 mentation suggests that this division of Pasccolus may belong to 

 Gystids. 



Pasccolus globosus, the type of the genus Pasccolus, belongs to 

 the group of species characterized by the presence of somewhat con- 

 cave plates, often marked by six stellate radiating lines of depres- 

 sion extending from the center of each plate toward the angles. 



It is not certain that the group typified by Pasccolus Jialli is 

 congeneric with Pasccolus globosus. Pasccolus darwini and Pas- 

 ccolus claudci belong to the Pasccolus globosus group. The plates 

 of Pasccolus grcgarius and Pasccolus intcrmcdius have not been 

 described. 



Labechia (?) corrugata, sp, nov. 



(Plate I, fig. ii.) 



In the Whitewater bed, along Dutch creek, near Wilmington, 

 Ohio, an encrusting form of some Stromatoporoid occurs which 

 differs from any of the s])ecies described hitherto from Cincinnatian 

 rocks in the irre"ularit\- of the nodules or ridees ornamentins' its 



