246 ON TRAPA NATANS. 
the excavation in the receptacle, by which the fruit of the typical 
form becomes so nearly inferior. Its fruit has alsoa thinner endocarp, 
ternal conditions to - form which characterised the first represen- 
-_ of the Trapa type. 
t is, however, to be hoped that positive proofs of the truth or 
untruth of this supposition will be afforded. Probably there are hive? 
in the vicinity of Lake Immeln where half-fossil fruits of 7. n 
may still be found. If such fruits belong to the typical ae ‘t 
may certainly be ass snmed that the species now living there has 
degenerated in -— manner above mentione 
s the name glaberrima, given by Wahlenberg, does not denote 
any characte eesti to the form, and moreover involves an error, 
the plan g by no means quite glabrous, and as also it is not yet fully 
decided that { the Scanian form is identical with that variety, I hav 
give A orm another name, and characterise it in the following 
Trae s natans, L., var. conocarpa, fructu e lateribus duobus ambitu 
ovali, maximam partem supero, parte supera conica compressa 
Hab.—In lacu Immeln, Scanie borealis, olim etiam in ‘lacubus 
Smolandiz borealis (2) & Vestrogothie (?). 
Description oF ae 134.—Fig, 1. Trapa natans, fey —_ the Bot. Garden 
TL. natans, var. conocarpa, from Scan: 
free part ; c, the point of a ae Figs, 8,9. Fruits (nat. gue of 7. natans, var. 
conocarpa, from 
[Translated and revised by the author from the “ Review of the - 
Transactions of the Royal Swedish Academy of Sciences” for 1873.] 
