BY E. F. MALLMANIJ. 491 



Plate xxvii. 



Fig. 1. — Trachydadm diyitatum Leiidenfeld, (typical form); siuface-sectiun, 



showing tlie arrangement of the dermal pores; ( x 40). 

 Fig.2. — T. diititatUK var. yracilis, var.nov. ; surface-section, showing the 



arrangement of the dermal pores; ( x 40). 

 Fig.3. — T. diijifatiis var. c/aratus, var.nov.; surface-section, showing the 



arrangement of the dermal pores; ( x 40). 

 Fig. 4. — T. di(ji/atii.s \sii\ i<troii</i//atu><, y&v. nor.; surface-section, showing 



the arrangement of the dermal pores; ( x 40). 

 Fig.o. — T. reteparosm, sp.nov., (tj'pical f(jrin); surface-section, showing 



the arrangement of the dermal pores; ( x 40). 

 Fig.o. — T. pHstido'fUft, sp.nov.; surface-section, showing the arrangement 



of the dermal pores; ( x 40). 



Plate xxviii. 



Fig.l. — Trac/ii/c/adiis rtteporosus, sp.nov., (var. ?); portion of the surface 

 (of one (^f the specimens R.N. 1000) showing the arrangement of the 

 dermal pores; ( x 40). 



Fig.2. — T. re(epo)-Ofiiis, sp.nov., (var. ?); surface-section (of R.N. 1061), 

 showing the arrangement of the dermal pores; ( x 40). 



Figs. 3, 4. — T. refeporo»u», sp.nov., (var. '!); surface-sections (of the speci- 

 mens R.N. 983, 984), showing the arrangement of the dermal pores; 

 ( X 40). 



Fig.o. 7'. dl(/ifa/iis Lendenfeld, var. claratu.^, var.nov.: rather thin (unde- 

 silicified) transverse section of a branch; ( x 15). 



Fig.6. — T. ■•<cal>ro.'<iis, sp.nov.; rather thin (desilicilied) transverse section 

 of a branch; ( x 20). 



Plate xxix., figs. 1-2. 



* Fig.l. — Trachydadus diijiiatus hendenield, var. claratus('i), var.nov.; speci- 

 men R.N.4I0; (xA). 

 Fig.2. — T. retejJorosuK, sp.nov., (var.?); thin, transverse section of a branch 

 • (of specimen R.N. 1000); ( x 15). 



Plate xxxix, figs. 6-7. 



Fig.6. — Tradii/c/adiis pU'<tu/o.'<U'<, sp.nov. ; skeleton photographed by 



transmitted light; (nat. size). 

 Fig. 7. ^7'. pustulosiiM, sp.nov.; showing pattern of the skeleton as seen in 



thin longitudinal section (passing through three branches and the 



upper part of their common stem); ( x 5). 



