254 Mr. S. H. Scndder on Triassic Insects 



they appear darker in the middle than at the periphery, i. e. 

 they are more strongly refractive at the periphery than in the 

 middle. In general they are not unlike blood -corpuscles *. 



In the gemmules (of other Sponqillce) investigated by me 

 in the fresh state I have found the corpuscles in question 

 enclosed within a spherical cell. A precisely analogous 

 occurrence is figured by Prof. Vejdovsky f. In his figure J 

 we see the cells filled with elliptical corpuscles alone; the 

 round nucleus wdiich he has represented in his fig. 2 is 

 here not to be seen. I have also been unable to find the 

 nucleus. 



We still possess very fcAv statements with regard to the 

 contents of the gemmules, which, however, seem to merit 

 the attention of naturalists. The whole contents of the 

 gemmule are enveloped by a very thin membrane, wdiich at 

 the same time lines the inner surface of the gemmula- 

 capsule. In the upper part, t. e. at the bottom of the pore, 

 the germinal matter forms a small conical elevation {" mami- 

 liform projection " of Carter §) which extends as far as the 

 septum of the pore |i. 



XXXI. — Triassic Insects from the Boclaj Mountains. 

 By Samuel H. Scudder *\\. 



Early in 1882 Mr. Arthur Lakes, Professor in the Colorado 

 School of ]\Iines, discovered a bed of plants and insects near 

 Fairplay, Colorado, in rocks much older than any that have 

 before yielded insect-remains west of the Great Plains ; the 

 two or three specimens he sent me were sufficient to prompt a 

 more thorough ex])loration of the locality, which I was able 

 to make the following summer, resulting in the discovery of 

 a fauna f.nd a flora of considerable interest. 



The plants have been studied by Mr. Lesquereux **, who 

 pronounces the species — some thirty in number, but in a very 



* See F. Leydip, ' Lehrbuch der Histologie d. Mensclien iind d. Thiere,' 

 Fninkibrt, 1857, p. 44it, iig. 221 B. 



f ' Siisswasser-Sch-wiimme B'ihmens.' 



\ riispevkv, &c., fip", 5 d. And see ' Annals/ /. c. 



§ Ann. & Mog. Nat. Hist. May 1882, p. 306, tig. 10, e, h. 



II Loc. cit. lig. 5, a. 



^ From the ' American Journal of Science ' for September 1884, 

 pp. 199-203. 



** " On some Specimens of Permian Fossil Plants from Colorado," 

 Bull. INIus. Comp. Zool. vii. p. 243, 



