A NEW GENUS OF FOSSIL PLANTS. 465 
Aquatic herbs; fruit succulent? Carpels two; endocarp 
hard, dorsally keeled, deeply pitted and wrinkled, adhering by 
the ventral margin, stalked ; beak elongated ; seed curved round 
a process from the cell, testa coriaceous. 
LIMNOCARPUS HEADONENSIS, nobis. 
Syn. Carpolithes headonensis, J. S. Gardner in Rep. Brit. Assoc. 1887, 
pp. 420, 421, pl. 3. fig. 30. 
Endocarp 2 mm. long by 1'5 mm. broad, inflated, laterally 
compressed, deeply pitted; a large oval oblique pit on the side 
corresponds with the internal process round which the seed 
is curved; pedicels converging, about 3 the length of the endo- 
carp; beak slender, parallel, about 3 the length of the endocarp. 
The fruit resembles that of Potamogeton, but is distinguished 
by the carpels being adherent, 2 instead of 4, and by the pitted 
D 
Limnocarpus headonensis. 
4. Endocarp, side view, the secund carpel shown by dotted line. 4. Transverse 
section through fruit. c. Endocarp of another specimen, dorsal view. 
d. Seed somewhat shrivelled, from another specimen, All magnified 10 
diameters, 
endocarp with long slender stalk and beak. These characters 
Probably indicate that the two carpels were buried in asucculent 
exocarp; for pitted endocarps usually belong to fleshy fruits, 
and the convergence of the stalks would scarcely bring the 
carpels together edge to edge, unless they were already in some 
Way connected. Most of the endocarps are found detached, 
ut I have now seen six specimens in which the ripe endocarps 
adhere by their narrow ventral edge.* The inflation of the 
" The attachment is often so slight that several fruits have divided in 
* attempt to remove the adhering sand. 
