340 MR ROBERT KIDSTON ON THE FOSSIL FLORA OF THE 



EQUISETACE.E. 



Calamites, Suckow, 1784, Act. Acad. Tkeocl. Palat, vol. v. p. 359. 



Group I. Calamitina (emend.). Weiss, 1884, Steinkoiden-Calamarien, 



part ii. p. 59. # 



Calamitina (Calamites) varians, var. insignis, Weiss. 



Cal. (Calamites) varians, var. insignis, Weiss, Steinkoiden-Calamarien, part ii. p. 63, pi. i.; pi. xxviii. 



fig. 1. 

 Calamites varians, Germar, Vers. v. Wettin u. Ldbejun, p. 49, pi. xx. figs. 1-3. 



Remarks. — Rare. 

 Locality : — Camerton. 



Group II. — E ucalamites, Weiss, 1884, Steinkoiden-Calamarien, 



part ii. p. 96. 



Eucalamites (Calamites) (cruciatus) senarius, Weiss. 



Calamites (cruciatus) senarius, Weiss, Steinkoiden-Calamarien, part ii. p. 114, pi. xiii. fig. 2. 

 Calamites approximatus, L. & H., Fossil Flora, vol. iii. pi. ccxvi. 



Remarks. — The University Museum of Oxford possesses a fine specimen of 

 this species from Camerton, which is the original of pi. ccxvi. of Lindley and 

 Hutton's Fossil Flora, In the description of their plate (which is a reduced 

 figure of the fossil), the authors say — " It agrees in a striking manner with 

 the figures of Aims and Adolphe Bkongniart, with the addition of a 

 number of pits placed on the articulations, in a quincuncial manner, as in 

 Calamites cruciatus. Hence it is probable that the latter proposed species will 

 require to be reduced to C. approximatus." 



The specimen referred to in the above quotation, and figured by the authors 

 of the Fossil Flora on their plate ccxvi., belongs, however, to an entirely 

 different group of Calamites from that in which C. approximatus is now placed. 



In Eucalamites, which includes the Camerton plant, every node bears 

 branches. Fn Calamitina, on the other hand, in which C approximatus, Brongt., 

 is enrolled, the branch-bearing nodes are separated by a greater or less number 

 of nodes that do not produce branches. 



The Camerton specimen of Calamites (Eucalamites) senarius, which is a 

 compressed stem removed from the matrix, measures about 15 inches in length 

 and about 3f inches in width at its lower extremity. It consists of sixteen 

 perfect internodes and portions of two incomplete ones — one at each end of 

 the fossil. On the circumference of each node are borne six branch scars. 

 The internodes decrease slightly in length from below up, but in a somewhat 

 irregular manner. Their exact measurement is — 



* Abhandl. z. geol. specialdcarte v. Freusseu a. Thurinyischen Staateu, Band v. part ii. 



