DICOTYLEDONS. 167 



in strata of every age from the Devonian up through the Carboniferous, 

 Trias, Jura, Cretaceous and Tertiary. In this latter period, and at the present 

 day, the genus has had its maximum of development. This perfectly pre- 

 served cone is from the Lower Miocene Tertiary beds of Carbonne, France. 



Size, 6x3. 



No. 535. [1206, Cast]. Dammarites , Sternb. 



A conifer from tlie Inferior Oolite, Burton, Somerset, England. 



Size, 6 X 6. 



FAMILY CYCADACE^. 



No. 536. [1204, Cast]. Cycadoidea megalophylla, Buckl. 

 Syn. Mantellia nidiformis. Brongn. 



This short, spheroidal trunk prob- 

 ably belonged to a Cycad, — a tropical 

 plant related to the Conifers in struc- 

 ture and fructification, but totally 

 different in habit. It supported a 

 tuft of large, pinnated, palm-like 

 leaves; and the surface is covered 

 with rhomboidal scars formed by the 

 attachment of the leaf-stalks. Its 

 shape has caused it to be named 

 "Crcnc's Nest" by the quarrymen. Neither leaves nor fruit have been found. 

 From the Purbeck beds (Wealden), Isle of Portland, England, and now in 

 be Ward Collection, University of Rochester. Size, 12 xU2. 



No. 537. Trigonocarpus Noeggerathi, Brongt. 



Genus of nut-like fruits, ovoid, 3-6 ribbed. This species is ovate and tri- 

 costate. They are doubtfully referred to the Cycads. Carboniferous, Saar- 

 bi'uck, Rhenish Prussia. 



No. 538. Trigonocarpus tricuspidatus, Newb. 



Nut elliptical in outline. 3-costate, with a bottle-shaped nucleus. Coal 

 Measures, Mahoning Co., Ohio. 



No. 539. Carpolithes Brandonensis, Lesq. 



A fruit of unknown affinity. Eocene, Brandon, Vermont. 



No. 540. Fruit. 



This fruit, or nut, is replaced by Marcasite, which radiates from the small, 

 spherical nucleus in thin fan-shaped plates, whence the name "Cupid's 

 "Wings," by which they are commonly known. Lias, Lyme-Regis, England. 



