[ 703 ] 
XVII. Further Observations on the Organization of the Fossil Plants of the Coal- 
Measures.— Part III. Lyginodendron and Heterangium. 
By W. C, Wittiamson, LL.D., F.R.S., Emeritus Professor of Botany in the Owens 
College, Manchester, and D. H. Scort, M.A., Ph.D., F.R.S,, Honorary 
Keeper of the Jodrell Laboratory, Royal Gardens, Kew. 
Received May 14,—Read June 13, 1895. 
[PLatEes 18-29.] 
ConTENTS. 
Page 
Tntroduchion: . «2-3 # 4 Bow w © BOE Soa Bok ee EO hk Ge ee me a OR 
I. Lyyinodendron. © 6 6 6 ee ee ee ee ee ee 905 
tA OES GEM ae cee a a cae, Co SPAS a wets om Heed de VOB: 
1. General Structure . . . Be Oe a ee. a Sap ge a a we ee a ae Oe AOS: 
2. Course of the Vascular Sandios by Be cits din Bee by cage Sen Se che 2a Be cans a es OO 
3. Structure of the Vascular Bundles . . . ......... . . WI 
4, The Secondary Tissues . 2 1. 1 1 ee ee ee 
5. The Pith and Pericycle © 2 2 2 1 we ee ee FF 
6. The Cortex .. . sce dee cae ae a Jae ee Le LS 
7. On certain small Biers of the Tygeieettonition tsp i Qo aoe AA a ants 4c 720 
8. Structuralanomalies . 2... 0. we ee ee ee 72D. 
B. The Leaf. . . 2. 1... Mise te deal Ql. CR BD Hes go Sine can we RO 
1. Connection between Leaf and Stom Behe Se. ae BE le, SE i Oo ae Oe ee de OS 
2. Form of the Leaf . . . . gee eGR Se TAL Ie a? st EO 
3. Structure of the Petiole and Raohis doesie Sreieite ob 40 Bio'A- GOSH Ge 2S. 
4. Structure of the Lamina. . . wnts yl @ ce Ewa Bele GeO 
5. On a peculiar Bud-like Bisons ele SB Mining Sushi cman Aioheckte Ma pia foe 
C. The Root. . . . Sea ra Dorkor die ORR aR Anok ab ay WW ete. Se ee 8B 
1. Connection ee Root and Stom oo Fc ag de oe He Ra ee ee ae SESE. OS! 
2. Primary Structure of the Root. . . 2. ee ee ee ee eee 786 
3. Secondary Tissues of the Root. . 6 6. ee ee ee ee we 09 
4. Branching of the Root . 2. 1. 6 ee ee ee 740 
D. Habit and Dimensions ofthe Plant . . . - - ) ee ee ee ew ee PAL 
ll, Heerangi ce a ee Re ee ES eee 744 
Tiemtnehem. (sic Be aca ce gh ele we: Bel me wok Boe ple 
i, Heterangium Grievit. 6 6 6 6 eee 745 
® hie Siem. < o-e%: & Rw Mowe oe eRe oe Be we ee 
de Cocmedal amet GRe. -k -ros Goo BOS ae ew Ge Rem er Secs ED 
MDCCCXCV.—B. 9.4.96 
