THE FLORISSANT LAKE BASIN. 31 



Finally, there are about sixty Tenthredinidge of fourteen or fifteen species 

 and several genera, besides a single species of Uroceridse. 



Animal remains l^esides those of insects are rare at Florissant. The 

 most abundant is a species of thin-shelled Planorbis, which is not uncom- 

 mon, and always occurs in a more or less crushed condition; it is the only 

 mollusk yet found there (excepting a Physa or allied form and a single 

 small specimen of a bivalve, referred to above in the section from tlie south- 

 ern lake), and according to Dr. C. A. White is probably undesci'ibed, al- 

 though very similar to a species found in the Grreen River shales, diifering 

 from it principally in its smaller size. 



Fishes rank next in numbers. Eight species have been found, belong- 

 ing to four g'enera. Of Aniiidee we have Araia scutata and A. dictyocephala ; 

 of Cyprinodonts, Trichophanes foliarum and T. cojjei; of Catostomida", 

 Amyzon pandatum, A. commune, and A. fusiforme; and of Siluridae, Rhin- 

 eastes pectinatus. All the species have been described by Cope, excepting 

 T. copei, which was published by Osborn, Scott, and Speir. 



Several bird's feathers have been found in these beds, and a single tol- 

 erably perfect passerine bird, with bones and feathers, has been described 

 by Mr. J. A. Allen imder the name of Palpeospiza bella, and admirably 

 illustrated by Blake. No other figure of a Florissant animal has yet been 

 published. Besides these. Cope lias described a plover, Charedinus shep- 

 jjardianus, and writes that a finch is also found in these beds. 



The plants, though less abundant than the insects, are exceedingly 

 numerous, several thousand specimens having been studied by the late Mr. 

 Leo Lesquereux. About one hundred and sixty species have been described 

 or indicated, of which the apetalous plants show the larger number, sixty- 

 eight species; the next most abundant group is the polypetalous division, 

 forty species, the gamopetalous having twenty-five, the Coniferse eight, and 

 the lower plants nineteen species. 



Among the exogenous plants the following polypetalous families are rep- 

 resented : the Malvaceae by a rare species of Stereulia, besides some flowers 

 with long stamens, which are referred, doubtfully, to the genus Bombax. 

 Of Tiliacea^, a species of Tilia has been found. Of Rutacese, one species of 

 Ailanthus and one of Xanthoxylon. No less than ten species of Rhus rep- 

 resent the Anacardiacese, and two species each of Paliurus and Rhamnus 

 the Rhamnacea?. The Celastracese show three species of Celastrus and one 



