EaUISETITES. 63 



type, having a smaller diameter than the majority of the cylindrical 

 casts, and each leaf-sheath consists of about forty segments with 

 clearly defined surface characters ; this specimen may be compared 

 ■with Text-fig. 4, which represents a broad form with the characters 

 of E. lateralis. 



Yorkshire. BecMes Coll. 



V. 3648. Four casts in a vertical position in a finely laminated 

 sandy shale. Purchased. 



52,568. A flattened branch showing portions of several leaf- 

 sheaths and many diaphragms scattered about the surface of the 

 shale. The surface of the intemodes is well preserved, and 

 presents a finely tuberculated appearance when examined under 

 a pocket lens. 



Oolitic Shale, Scarborough. Bowerlarik Coll. 



10,328, Portions of two flattened leaf-sheaths with the long 

 pointed teeth spread out on the surface of the rock : the space 

 enclosed by the basal portion of the leaf-sheath was no doubt 

 occupied originally by a nodal diaphragm, as in the specimen 

 represented in PL XIX. Fig. 5. 



Cloughton. Mantell Coll. 



Other specimens : — V. 2613^ (a single node with branch-knobs), 

 V. 2613tf, V. 3292 (a block of micaceous sandstone penetrated by 

 root-like fossils which may belong to SJquisetites), V. 3649, 13,507, 

 39,130, 40,468 (part of a flattened leaf -sheath showing good 

 surface features), 40,469, 40,574 (vertical casts in sandstone), 

 40,575, 52,583. 



2. Equisetites Beani (Bunb.). 



[Quart. Joiim. Geol. Soo. vol. vii. p. 189, 1851.J 



(Text-figs. 5 and 6.) 



1851. Calamitea Beani, Buntury, Quart. Journ. Geol. Soc. Tol. vii. p. 189. 

 1854. Calamites £eanii, Morris, Brit. Foss. p. 3. 



1856. Calamites Seanii, Ziguo, Flor. foss. Oolit. toI. i. p. 45, pi. iii. fig. 1. 

 1869. 1 lEquiaetum eolmnnare, ScMmper, Trait, pal. veg. vol. i. p. 267- 



