Pyre. 848 



Pygopterus scutellatus^ Newberry. Proc. Ac. Nat. Sci. Phila., 

 1856, page 98. Colosteus crassiscutatus, Cope, Trans. Amer. 

 Phil. Soc. Phila. Vol. XIY, p. 23. Colosteus scutellatus, 

 Cope, Proc. Amer. Phil. Soc. Phila., 1871, p. 41. Pal. Ohio, 

 Vol. 2, 1 875, plate 99, figs. 1, 2, 3, one of the Ohio coal meas 

 ure batrachian reptiles, with strongly sculptured breast shield, 

 side plates, and belly covered with oblique scales. XIII, 



Pyrenomoeus cuneatus, Hall. Pal. N. Y. Vol. 2, 1852, 



T2. C 



page 87, plate 27, fig. 3. retaining the shell faintly striated, 

 beak remarkably elevated, and front end abruptly rounded ; 

 13 a^ 5, casts of opposite valves; c, cast of a large individual, 

 showing several prominent folds parallel to the lines of growth. 

 Fig. 3, was found below the Clinton fossil ore bed in Walcott, 

 N. y. Fig. 12a, J, <^5 in a shaly sandstone near the base of the 

 Clinton^ togethev with {Aynostis) ^e2/ncAm, in New Hartford, 

 Oneida Co., N. Y. In Perry Co., Pa., collected by Claypole 

 (Spec. 60-5, two), in Center township, at Waggoner's mill. 

 Clinton^ V a. Note. — Hall established the genus for shells 

 like Nucula, and so named it. 



Rain drops, with Ripple m<zrA*, and JI/^^ci^cT'ao^^, have been 

 noticed on the surfaces of rock strata of many ages. Among 

 the earliest instances are the characteristic forms given by N. 

 W. Perry in the American Naturalist of December, 1889, from 

 photographs of the surfaces of slabs of Hudson River ( Cin- 

 cinnati) slate. III G. — On Carboniferous mud shale (figs. 1, 

 2), compared with rain pits now made on the muddy shores of 

 the Bay of Fundy. ( Fig. 3 ) , Dawson, Acadian Geol. 1868, p. 27. 

 — In Hitchcock's Ichthyology of Mass. 1858, plate 32, fig. 1, 

 may be found an instructive exhibition of the print of a boy's 

 naked foc»t, a bird's foot, and many rain drop pits around and 

 upon them. In his Final Report of the Geol. Mass. he gives 

 a sketch of a good specimen of rain drops natural size. I 

 take from his Ichth^^ol. Mass. plate 56, figs. 6, 7, 8, of ripple 

 marks and rain drops, much reduced,, fig. 7, being an unusual 



