Manchester Memoirs, Vol. xlviii. (1903), No. %. 13 



of this type of Calamitean foliage will be found. Mr. 

 Kidston, however, who has recently seen the portion of 

 the specimen figured by Binney which is at Cambridge, 

 thinks that there is some room for doubt about this 

 specific determination, on account of the imperfection of 

 the preservation. 



Calamitean Leaf-sheath. 



Sedgwick Mus. Camb., Carb. Plant Coll., Nos. 385 

 (figured), and 1125. 



Figured, Seward, Fossil Plants, Vol. I., p. 260, Fig. 56. 



The Ardwick specimen, which Mr. Seward has figured 

 in the first volume of his Fossil Plants, is of interest, as 

 showing a form of Calamitean leaf-sheath, which is probably 

 not very common, and which differs in certain respects 

 from other types of Calamitean foliage. In this specimen 

 the sheath is comparatively long {2\ cm.), and apparently 

 composed of many segments united together. The free 

 leaves, of which only one is shown in this specimen, are 

 very short ("8 cm.) and narrow. A specimen rather similar 

 to this is figured in Dr. Scott's Studies in Fossil Botany 

 (p. 35, Fig. 11), and Germar^ has also figured others of 

 the same typel These specimens do not seem to agree 

 very well with the characters of the genus Annularia, the 

 great group of Calamitean leaves, in which the free seg- 

 ments are united into a collar at the base. In Annularia 

 the leaf-sheath is usually very short, and the free leaves 

 much longer than the sheath, while in this specimen they 

 are almost reduced to teeth-like appendages. Also in 

 Annularia the leaves are usually linear-lanceolate. Here, 

 however, their general character rather recalls those of 



' Germar. ('44), Fasc. 2, PL x., Figs. 2-3. 



^ The sheath in these specimens is larger, and the free segments very 

 much smaller than in the fine examples oi A. stellata figured by Potonie 

 ('93)> t^'igs- 1-2. 



