108 THE JOURNAL OF BOTANY 
Fruit obliquely linear-oblong, narrowing at the tip; 1-14 lines 
long, about + line in diameter; pericarp thin, closely enveloping 
e seed. Seed hard, brown, marked with 12-18 longitudinal rows 
of ladder-like pits; raphe ala in the lower half of the 
seed, causing a slight asym 
€ species is readily Tiueished from all others by the 
transversely elongated — ings on the testa, which are more 
than twice as broad as lon 
The internal structure a the stem (cf. ‘ig. 5) cout resembles 
that of N. graminea, already figured by Mr. Bailey in this Journal 
(1884, 808, t. 42). The Hct nt consists of cells which scarcely 
differ from those of the underlying thin-walled cortex. About half 
the width of the cortex consists of large intercellular spaces bounded 
by bands of parenchyma one cell thick, and separated from the epi- 
dermis by generally two layers of similar cells, and on the inside by 
one to two layers from the stele, a central axis of much smaller 
Professor Gunite has sove « that in N. flewilis, which has a 
adult stem. The three to four la ers of narrow Csralicty 
shaped thin-walled cells surrounding the space show no traces 
of differentiation. 
The stem-structure is typical of the a eco Caulinia, and 
affords a well-marked contrast with that N. marina, where the 
epidermis is a layer well differentiated Ro. the cortex, and the latter 
much more substantial structure, of which the intercellular spaces 
occupy a much omar proportion. Nor does it seem possible in 
N., minor to make out an endodermal structure in the cells of the 
consisting of two layers of cells separated by a large i fitevocllular 
space on each side the i hie at which an additional layer surrounds 
a narrow small-celled a 
England.—Seeds ean ae in pleistocene beds at West Wittering, 
Sussex Seal ; and Cromer forest-bed (preglacial) at Pakefield, 
Suffolk (Re 
Generally distributed over the southern half of the continent of 
Kurope from France to South Russia, and in Asia from Asia Minor 
; I have also ia. 
The Preglacial hag est at Pakefield in which N. minor is asso- 
(ei, l. ec. 85 ;, aul of which, except the South Eur 
rs 
oO 
2 
5 
a 
list of ninety-four species, all of which, except the two of Najas, 
are still found in Britain; but ney also found ‘ several well-marked 
forms, which do not belong t o any living British plants, but 
cannot yet be identified.” ‘‘ The plant-bed att egege remains of 
