NATURAL SCIENCES OF PHILADELPHIA. 155 



turtle eggs. They were found b}^ Dr. J. Yan A. Carter, of Fort 

 Bridger, Wyoming, in the same formation which has yielded so 

 many remains of turtles. Dr. Carter had discovered upwards of 

 forty of them together, and first suggested the idea that they 

 might be eggs. Prof Hayden's collection from the same vicinity 

 contained several specimens of the same bodies, Avhich had been 

 incidentally glanced at as coprolites. The uniformity in shape 

 and size of these bodies, coupled with the structure, which con- 

 sists of a thin homogeneous stony shell filled with an arenaceous 

 matrix, renders it probable they may be eggs. They have the 

 elongated oval form of the eggs of our common Emi/,H 2ncta^ and 

 measure about an inch in length and five lines in the short dia- 

 meter. 



Remarks on the Garnets of Greenes Creeh^ Delaware Co. — Prof 

 Leidy also directed attention to the character of the garnets of 

 Green's Creek, Delaware Count3^ These garnets, usually much 

 prized b}^ our mineralogists, appear not to have been discovered 

 in place, and have been found as part of the pebbles of the creek 

 bottom. They never present a crystalline form, and are looked 

 upon as rolled pebbles. Specimens exhibited show a singular 

 grooved appearance, apparently due to the abstraction of crystals 

 of some other mineral, which had been imbedded in the surface of 

 the garnets. This condition would indicate that the garnets 

 probabl}^ existed in the rock in the form of nodules and not of 

 ci-ystals, as is frequently the case with minerals imbedded in trap 

 rocks. In Dana's Mineralogy it is stated that chlorastrolite occurs 

 on the shores of Isle Royale, L. S., in small rounded pebbles which 

 have come from the trap and are water-worn. To avoid an erro- 

 neous impression, it should rather state they are found in the trap 

 as rounded nodules, and become detached by the breaking up of 

 the trap on the shores of the lake. 



Mr. Thomas Meehan referred to some remarks made by him to 

 the Academ^^ recentlj'' in regard to variations in the cotyledons 

 of the peach, in which the most striking fact was that there was 

 a multiplication of cotyledons when there was a plurality of era- 

 brj'os, without an}' increase in the usual cotyledonous mass; and 

 that in the division of this mass no proportionate rule was adopted 

 in the apportionment of each. He said he could not then under- 

 stand how this arrangement accorded with the general opinion 

 that the lobes of the dicotyledonous seed were formed almost 

 simultaneously with the origin of the fertilized vesicles, but dared 

 not express his doubts on that one instance alone. But he had 

 now to offer for the examination of the members numerous speci- 

 mens of sprouting cotyledons of Querent robur and Quercus ru- 

 bra, which seemed to admit of no otiier conclusion than that the 

 division into cotyledons was accomplished long after the cotjde- 



1871.] 



