British Coal Measures . 
95 
Cast ovoid, with three sharp, equidistant longitudinal ridges. Apex pointed, 
base often rounded, sometimes with a slight umbilicus, but no foramen. 
Length of cast from i *8-2*8 cm., greatest breadth usually less than 1*5 cm. 
(2) Trigonocarpus Moyseyi, sp. nova. 
T. Moyseyi , forma a (PI. I, Fig. 1). Impressions of the external 
surface of the seed. Type Trigonocarpus , sp., Arber, ‘Fossil Plants/ Fig. 
on p. 42, 1909 ; Arber, Proc. Yorks. Geol. Soc., vol. xvii, pt. ii, p. 150 
PL XVIII, Fig. 1, PL XIX, Fig. 3, 1910. Recorded from the Middle Coal 
Measures of the Notts, and Derby coalfield. 
Seed broadly elliptical, 4*2 cm. long and 2*5 cm. across, broadly rounded 
at each end. Micropyle more than 1 cm. long, nucule ovate, i*8 cm. long and 
1*5 cm. broad at its greatest width, pointed at the apex, broadest at the base. 
Wing broad, especially at the apex, 2*3 cm. broad at the lower termination 
of the micropyle, ? irregularly plicated. Testa smooth. 
T. Moyseyi , forma /3 
T. Moyseyi, forma y 
(3) Trigonocarpus Dawesi , Lindley and Hutton. 
T. Dawesi , forma a 1 , 
^ r , . c unknown. 
T. Dawesi , forma f3 j 
T. Daivesi , forma y (PL VI, P"ig. 8), Type, Trigonocarpum Dawesii , 
Lindley and Hutton, 1 Fossil Flora/ vol. iii, PL CCXXI, Figs. 1 and 2, 1837. 
Recorded only from the Middle Coal Measures of South 
Lancashire. Cast similar in every respect to T. P 'arkinsoni, 
forma y, except in dimensions. Cast about 4*5 cm. long and 
2*5 cm. across. 
(4) Trigonocarpus clavatus (Sternberg) (Text-fig. 1). Types, 
Carpolites clavatus and C. lagenarius , Sternberg, ‘ Vers. 
Darstell. Flora d. Vorwelt/ Heft 1, PL VII, Figs. 14 a, 14 b, 
16, 1820; Heft 5-6, pp. xl-xli, 1833. Recorded from the cla p atl p (Stemb.). 
Transition Coal Measures of the South Lancashire coalfield. 
Seed small, 2 cm. long and 1 cm. or more across, flask-shaped, nucule 
pestle-shaped, micropyle short, sarcotestal wing narrow, apex truncated, testa 
striated with fine, parallel striae. 
unknown. 
\J 
Text-fig. i. 
Trigonocarpus 
Genus Platyspermum, gen. nova. 
Seeds of medium size, oval or elongately oval, not winged, testa 
ornamented with many ribs, approximated or not approximated at the base 
and apex, with or without fine parallel striations or ribs. 
(1) Platyspermum sulcatum (Presl) (PL VI, Fig. 11). 
Type Carpolites sulcatus , Presl in Sternberg, 6 Vers. Darstell. Flora d. 
Vorwelt/ vol. ii, Heft 7, p. 208, PL X, Fig. 8, 1838. Recorded from the 
Transition Coal Measures of South Staffordshire, and from the Middle Coal 
Measures of Warwickshire and Yorkshire. 
