British Coal Measures. 
85 
We have next to inquire whether any other species of this genus 
are known from the British Coal Measures as impressions. After a careful 
study of the subject, I have arrived at the somewhat startling conclusion 
that there are only three other species known from this country, and none 
of them so completely as T. Parkinsoni , Brongn. These are : 
Trigonocarpus Moysey i, sp. nova. Forma a. 
Trigonocarpus D awe si , L. & H. Forma y. 
Trigonocarpus clavatus (Sternb.). Formae a and ft. 
Trigonocarpus Moyseyi , sp. nova (PI. VI, Fig. 1). I originally figured 1 
this fine specimen in Dr. Moysey’s collection as Trigonocarpus sp., with the 
suggestion that perhaps the so-called T. Noeggerathi of Sternberg might be 
the forma y of this seed. At that time I was under the impression that the 
above species was a state of a true Trigonocarpus. A more careful study 
of the subject, however, has led me to remove T. Noeggerathi , Sternb., from 
the Platysperms, at least provisionally, for the reasons stated below (p. 86). 
I now regard Dr. Moysey’s specimen as the type of a new species, which 
I name T. Moyseyi , sp. nova, in honour of one who has done so much for the 
palaeontological investigation of the Nottingham coalfield. 
T. Moyseyi differs from T. Parkinsoni chiefly in size and shape, as will 
be realized if PI. VI, Fig. 1 be compared with the specimen figured by Scott 
and Maslen on PI. XII, Fig. 17 of their paper. Both figures are magnified 
equally. T. Moyseyi is much broader in proportion to its length, and has 
a shorter micropyle. The formae ft and y of this seed are unknown. 
Trigonocarpus Dawesi , L. and H. (PI. VI, Fig. 8). This seed is only 
known as forma y casts, which correspond almost exactly to T. P arkinsoni, 
forma y except in size. It is twice as large as the latter. It is a rare type. 
Trigonocarpus clavatus (Sternb.) (Text-fig. 1, p. 95). The obscure and 
rare types, the Carpolites clavatus and C. langenarius of Sternberg, which 
Geinitz and others have referred to Rhabdocarpus , are in my opinion 
probably a small Trigonocarpus , formae a and ft. The general shape of the 
seed, the micropyle, and the fleshy sarcotesta support this conclusion. The 
fine longitudinal striation of the testa, on which stress has been laid as 
an indication of generic affinity, is in reality common to several genera 
of Palaeozoic seeds. This is the smallest British example of the genus, 
and may possibly be only an immature condition of another species, 
though this is by c no means certainly the case. 
These are the only British representatives of the genus which I am 
inclined to recognize. There are, however, several other species, usually 
placed in this genus, which may be briefly discussed. A knowledge of the 
forma y casts of Trigonocarpus P arkinsoni has had a very profound influence 
on the nomenclature of other Palaeozoic seeds. Any egg-shaped cast, 
1 Arber (10), p. 150, PI. XVIII, Fig. 1, PI. XIX, Fig. 3, and Arber (’09), p. 42. 
