186 THE LATE DR, NEWELL ARBER: CRITICAL STUDIES 
Dr. Kidston (18. p. 136) has recently concluded that Z. triangularis is 
closely related to the species here termed L. radians, Schimper, and, “if 
really distinet from it. differs only in the sides of the bracts being perhaps 
somewhat more concave.” To my mind, however, these two species are 
quite distinct in the shape of the sporophyll as a whole, and especially in the 
dissimilarity in the size and shape of the lamina and pedicel, and in the pro- 
longation of the lateral angles of the former, as a comparison of figs. 28-31 
with figs. 32 and 33 will show. 
On PI. 9. fig. 33 a detached sporophyll is shown. 
Type. ? Museum of Ecole des Mines, Paris. 
Distribution. Middle Coal Measures. 
Coalfields :— South Welsh. South Staffordshire. North Staffordshire. 
Notts & Derby. Yorkshire. 
Section Sublepidostrobus. 
LEPIDOSTROBUS JACKSONI, Arber. (PI. 9. fig. 34.) 
Sporophylls attached, 
1916. Lepidostrobus Jacksoni, Arber, in Phil. Trans. Roy. Soc. Ser. B, vol. ecviii, p. 147, 
pl. 4. fig. 19. 
Diagnosis —Cone of medium size, stalked, more or less club-shaped. 
Lower portion of sporophylls broad, seale-like, distal extremities prolonged 
as very narrow, elongated appendages, 4 mm. or more in length. 
Remurks.—The type-specimen is refigured on Pl. 9. fig. 34, natural size. 
It has a length of 6:1 cm., and measures 2 em. across at the apex, the 
broadest part. It contracts rather suddenly at the base. Only a portion of 
the lamina is seen, the lower part being broad but suddenly contracted above 
into long awn-like prolongations. 
Type. No. 3250. Carbon. Plant Coll., Sedgwick Museum, Cambridge. 
Distribution. Middle Coal Measures, 
Coalfield :--South Staffordshire. 
LEPIDOSTROBUS (?) sPINOSUS, Kidst. (Pl. 9. fig. 35.) 
Sporophylls attached. 
1838. Lepidostrobus sp., Brongn., Hist. Végét. Foss. vol. ii. p. 49, pl. 22. figs. 2, 3, & 8. 
1888. Lepidostrobus spinosus, Kidston, in Trans. Roy. Soc. Edinb. vol, xxxiii. p. 396. 
1893. Lepidostrobus (?) spinosus, Kidston, in Trans. Roy. Soc. Edinb. vol. xxxvii, pt. 2, 
p. 941, pl. 2. fig. 7, pl. 3. figs. 11 & 12. 
Diagnosis.—Cone oblong and tapering to its blunt apex ; bracts lanceo- 
late, acute, single-veined, adpressed, rigid ; external extremities of sporangia 
rhomboidal (Kidston, 1893). 
