ACROGENS. 



169 



ISTo. 546. Stigmaria ficoides, Brngt. 



This geuus may represent the subterrauean stems and roots of Sigilhira and 

 other plants, or perhaps some forms may be the stems of floating plants. 

 Coal Measures, Scranton, Pa. 



No. 547. [1326, Cast]. Stigmaria ficoides, Brugt. 

 Coal Measures, South Joggins, Nova Scotia. 



Size, 10 X 5. 



FAMILY EaUISETACE^. 



No. 548. Ancylogonatum carbonacium, Rom. 



Lower Oolite, Whitby, England. 



No. 549. Annularia longifolia, Brngt. 

 Coal Measures, Mazou Creek, Grundy Co., 111. 



No. 550. [1329, Cast]. Calamites. 



The family — Equisetaceae — is still represented by the common " Horse-tail" 

 or scouring brush. AsteropkylUtes is only the foliage of Calamites. 



Size, 12 X 4. 

 No. 551. Equisetites arenaceus. 



Keuper, Stuttgart, Wurtemberg. 



FAMILY FILICACE^. 



No. 552. Archaeopteris Jacksoni. 

 Catskill, Montrose, Penn. 



No. 553. Neuropteris hirsuta, Lesq. 



This beautiful fern, so 

 <;haracteristic of the Coal 

 Measures, is from Mazon 

 Creek, Grundy Co., Ills. 



No. 554. Pecopteris villosa, Brngt. 



Coal Measures, Mazou Creek, Grundy Co., Ills. 



No. 555. Spheno'pteris communis, Lesq. 

 Sub-Carboniferous, North Western, Arkansas. 



CLASS THALASSOPHYTES. 



No. 556. Spirophyton caudi-galli, Vanuxem. 



This is generally regarded as a sea-weed, although thought by some geol- 

 ogists to be only the result of mechanical forces. Caudigalli Grit, Rondout, 

 N. Y. 



