L044 



DR R. K1DST0N, MR T. C. CANTRILL, AND MR E. E. L. DIXON. 



across at right angles to the axis. The secondary shorter clefts are not very clearly 

 seen, as in some cases their extreme marginal parts are slightly buried in the matrix, 

 but they can be observed at one or two points on the enlargement (fig. 2a). 



Weiss distinguishes a var. major and a var. minor, of Cingularia typica ; the 

 former has twelve principal lappets in the fertile whorl, and the latter ten. The 

 English specimens, as seen from fig. 2, belong to the var. minor, but these differences 

 in the numbers of the parts do not seem to be of much value. 



It has been thought by Weiss that possibly the fossil figured by Bronn as 



B. 



C. 



Text-fig. 4. — Cingularia typica Weiss. (Copied from Weiss.) 



A, Restoration of portion of a cone showing a sterile whorl, a, of which the bracts are united at their 

 base to form a flat, disc-like collar round the stem ; b, the fertile whorl, in which the 

 sporophylls are also grown together at the base, but at their distal extremity are divided into 

 two truncate segments, b' and b' , to whose lower surface are attached the sporangia s' and s . 

 The sporangia s" and s'' are attached to the undivided portion of the sporophyll b" and b" . 

 B shows one of the sporophylls as seen from above, with part of the concentric line I at the 

 base of the free quadrate terminal portions. C shows the under surface of a sporophyll ; I, the 

 concentric line ; s', s', the scars of the two outer sporangia on the truncate free extremities of the 

 sporophyll ; $", s", the scars of the two inner sporangia on its undivided portion. 



Equisetum infundibuliforme, from the Coal Measures of Saarbruck, may be a 

 specimen of Cingularia typica on which the sterile whorls only are seen.* 



It has been suggested by Schuster that the plant described by Zalessky as 

 Equisetum Kidstoni t might be Cingularia typica ; but even if it should eventually be 

 shown to belong to Cingularia, the sheaths seem to have much too large a circum- 

 ference for reference to Cingularia typica Weiss. 



The possibility of Sphenophyllum cornutum Lesqx.j being referable to Cingularia 



* Bronn, in Bischofj', I.e., pi. iv, fig. 4, 1828 ; copied by Brongniart, Hist. d. ve'git. foss., p. 119, pi. xii, fig. 16. 

 Bronn's specimen is certainly specifically distinct from the other specimens which Brongniart includes under the 

 name of Equisetum infundibuliforme ( = Macrostachya infundibuliformis). 



t "Contributions a la flore fossiledu terrain houil. du Donetz," part i, Bull. Comite ge'ol. (St P&ersbourg), vol. xxvi, 

 p. 359, pi. xiii, fig. 6« ; pi. xvi, figs. 1, 2, 3, 1907 ; ibid., part ii, p. 424, pi. xxi, fig. 5, 1907. 



I Geol. Survey of Win., vol. iv, p. 421, pi. xix, figs. 1, 2 (right-hand fig.), 3-5, 1870 ; Coal Flora, p. 57, pi. lvi, fig. 5. 



