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104 DR. D. H. SCOTT ON THE HETERANGIUMS 
Phot. 12. Form 8. General transverse section from specimen 6. 
T. 1. Double leaf-trace in the outer part of the pericycle. 
T. 2. Another double trace, just entering the cortex. 
x about 18. Slide, Univ. Coll., N. 3. 
Phot. 18. Form 8. General transverse section from specimen 5. 
ph?, secondary phloem; Ay., thin-walled hypoderma. 
T. 1. Inner leaf-trace, of two separate bundles, just leaving the stelar wood. 
T. 2. Outer trace, two minute bundles in pericycle. 
x about 10. Slide S. 625. 
Phot. 14. Form * eylindricum." | General transverse section. 
T, 1. Inner leaf-trace, consisting of two strands, just starting from the stelar wood. 
T, 9. Outer trace of two double bundles in the cortex. 
x about 10. Slide, Univ. Coll., N. 
Phot. 15. Form æ. Part of a transverse section from specimen 1, showing a leaf-trace, 
consisting of two double bundles, v.b. a, xylem of stele. 
x about 35. Slide, Manchester, Q. 10. 
PLATES 3 & 4. 
From drawings by Mr. G. T. Gwilliam. 
PLATE 3. 
Figs. 1-7. Heterengium shorense. 
Fig. 1. Transverse section of stem, showing stele with perieyele, and cortex with sclerotic 
masses and Sparganum hypoderma. | 
A., A., leaf-base with three bundles preserved (cf. fig. 2); D., B., next inner trace, with 
four bundles in pairs; C., C., trace further in, consisting of two double bundles 
(cf. fig. 6) ; D., innermost trace of two bundles. 
x 7. Slide S. 2791. 
Fig. 2. Trausverse section of leaf-base attached to stem. The four bunda (v.b.) in the 
leaf-base are evident. 
sc., sc., sclerenchyma delimiting leaf-base at the sides ; s.p., sclerotic plate. 
x6. Slide S. 2787. : 
Fig. 3. Detached petiole, containing eight bundles in four pairs. 
s p., sclerotic plate. 
x6. Slide S. 2787. 
ig. 4. Leaf-trace consisting of two bundles (v.b.), starting from the stele. 
zi 
a 
st., stelar wood. 
x 96. Slide S. 2794. 
Fig. 5. Part of primary xylem, showing three peripheral strands. 
px., protoxylem of one of the strands. 
x96. Slide S. 2792. 
Fig. 6. Part of stele and half a leaf-trace. 
x2, secondary xylem beginning to form on stele; pe., pericycle; v.b., double bundle, 
. forming one-half of the trace C., C., shown in fig. 1. 
x 46. Slide S. 2791. 
Fig. 7. Part of pericycle and inner cortex. 
pe., pericycle, with numerous sclereides ; ¢., inner cortex with a large sclerotic plate. 
x 33. Slide S. 2791. 
