40 Miscellaneous. 
repetition of that of the Aphroditacee. Their feet are simple rami, 
which have no relation to the limbs of the Arthropoda. 
It must, however, be admitted that the reproductive organs of the 
Myzostoma differ considerably from those of the true Annelids. 
Leaving out of consideration their hermaphroditism, which occurs 
also among certain polycheetous Annelids, the existence of a cloaca 
deserves to be especially indicated. 
The deferent canals are also exceptional, at least unless we com- 
pare them with the segmentary organs of those Cheetopoda which 
have only a single pair (Parthenope). The existence of ventral 
suckers is a peculiarity of little importance, and in accordance with 
the conditions of parasitism. Moreover a sucking-disk is met with 
in the Leucodore among Cheetopoda.—Zeitschr. fiir wiss. Zool. xvi.; 
Bibl. Univ. 1866, Bull. Sct. p. 153. 
On the Synonymy and Geographical Distribution of Jussivea repens 
(Linn.). By C. Martins. 
Having for the last four years cultivated one of the species of 
Jussica under the most varied conditions of dryness and moisture 
and shade and light, I have been able to demonstrate how the form, 
the size, the pubescence of the leaves, the size of the flowers, and, 
indeed, the entire habit of the plant were subject to vary. After 
having familiarized myself with all these forms, I consulted the her- 
baria, and personally visited those of the museum and of MM. De- 
lessert and Cosson at Paris, of Delile and Cambessides at Montpel- 
lier, and of M. de Candolle at Geneva. Dr. Hooker, at my request, 
was good enough to go through that of Kew, and M. Boissier that 
which he possesses at Geneva. From this examination it results 
that Jussica repens, described by Linné in 1747*, has since received 
twelve different names: namely, J. adscendens, Linn.; J. diffusa, 
Forsk.; J. grandiflora, Mich.; J. peploides, H. J. Kunth; J. fluvialis, 
Blume; J. ramulosa, De C.; J. swartziana, De C.; J. stolonifera, 
Guill. et Per.; J. alter nifolia, E . Meyer; J.austr alatica, Ferd. Miill. ; 
and J. fluitans, Hochst. 
I am not the first botanist who has perceived that some of these 
names do not represent species, but simple varieties. Linné, De 
Candolle, Sir William Hooker, Schiede and Ehrenberg, Torrey and 
Asa Gray, Hasskarl, Miguel and Grisebach each united some of 
them, but without regarding them all as mere modifications of one 
and the same specific ‘type. 
This multifarious synonymy has nothing extraordinary in it ; it 
may be explained by the immense area which Jusste@a repens occu- 
pies on the surface of the globe, as much as by the variability of its 
form, every botanist hesitating to recognize an Indian species in an 
African, American, or Australian plant. This great extension jus- 
tifies the law laid down in the first place for Lapland alone by Linnéf, 
and since extended to the whole world by A. de Candolle{—namely, 
* Flora Zeylanica, p. 75. t Flora Lapponica, Prolegomena, § 31. 
{ Géographie botanique, p. 1005, 
