ioo Arber . — A Revision of the Seed Impressions of the 
wrinkles or ridges, transverse or oblique, and a faint outline of large nucule. 
Testa smooth, striae fine and thread-like. 
Genus Microspermum, gen. nova. 
Seed small, symmetrical only in a single plane, with a large foramen. 
Seed flattened, the two sides being dissimilar. 
Microspermum samar oides (Carpent.) (PI. VII, Figs. 22-27). 
Type Carpolithes ? samar oides, Carpentier, ‘ Comp. Rend. Assoc, frang. 
Avanc. Scienc./ Lille, 1909 ; Notes et Mem., p. 599, 1910 ; and ‘ Rev. Gen. 
Bot./ vol. xxiii, p. 7, PI. XIV, Fig. 3, 1911. From the Lower Coal Measures 
of Trowell Colliery (Horizon of the Kilburn Coal), Nottingham. 
Seed small, ovate or pyriform in shape, S~ 12 mm - long and 2*5-6 mm. 
across at its greatest width. One extremity broadly rounded, the other acute. 
Seed flattened, unsymmetrical ; one side with a strong keel extending from 
the pointed end nearly to the opposite extremity ; the other side more or 
less convex, with a slight median groove, on either side of which are several 
faint longitudinal striations, converging towards the pointed end. A large 
foramen occurs at the broader end on the grooved surface, and more rarely 
a small foramen is also seen at the pointed extremity. 
Genus Cordaicarpus, Geinitz, 1862. 
Seeds rather small, oval or orbicular. Testa smooth, not ribbed or 
striated longitudinally. 
(1) Cordaicarpus areolatus (Boul.) (Text-fig. 7). 
Type Cardiocarpus ( Cordiacarpus ) areolatus , Boulay, ‘ Rech. Pal. 
Veget. Terr. Houill. Nord France/ p. 34. Recorded from the Middle 
Coal Measures of Warwickshire. 
Text-fig. 7. Cordaicarpus areolatus (Boul.). x 2. 
Seed small, orbicular, 4-6 mm. in diameter, the testa ornamented with 
a network of large, polygonal meshes, not very prominent. 
(2) Cordaicarpus Cordai, H. B. Geinitz (PL VII, Fig. 29). 
Type, Cai'polithus Cordai , Geinitz, ‘Vers. Steinkohlenf. Sachsen/ p. 41, 
PI. XXI, P'igs. 7-16. Recorded from the Middle Coal Measures of several 
coalfields in England. 
Seed of fair size, orbicular, 8-20 mm. in diameter. Testa smooth. 
(3) Cordaicarpus ovoideus (Berg.) (PI. VII, Fig. 30). 
Type Rhabdocarpos ovoideus , Berger, ‘ De Fruct. et Semin./ p. 22, 
PI. I, Fig. 17. Recorded from the Upper Coal Measures of Radstock, and 
the Middle Coal Measures of South Staffordshire and Yorkshire. 
