EQUISETITES. 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. Beckles 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 internodes is well preserved, and 

 presents a finely tuberculated appearance when examined under 

 a pocket lens. 



Oolitic Shale, Scarborough. Bowerlank 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. 26133 (a single node with branch-knobs), 

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

 root-like fossils which may belong to Equisetites], 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. Journ. Geol. Soc. vol. vii. p. 189, 1851.] 



(Text-figs. 5 and 6.) 



1851. Catamites Bani, Bunbury, Quart. Journ. Geol. Soc. rol. vii. p. 189. 

 1854. Catamites Heanii, Morris, Brit. FOBS. p. 3. 



1856. Calamitet Eeanii, Ziguo, Flor. fosa. Oolit. vol. i. p. 45, pi. iii. fig. 1. 

 1869. ? Equisetum columnare, Schimper, Trait, pal. veg. vol. i. p. 267- 



