Miscellaneous. 491 
Lastly the Rhynchoceeles or Nemertians are represented in the 
deep fauna by Prostomum lineare and Prorhynchus stagnalis, which 
are also found, the former in the pools of the shore, the latter in 
springs and under the stones of rivulets. 
These observations are sufficient to show that the deep fauna of 
the Lake of Geneva has originated, at least as regards the Turbel- 
laria, from the littoral and paludicolous species of the neighbouring 
regions. Yet (and this is the most remarkable point in this investi- 
gation) two species of the deep fauna completely evade this inter- 
pretation, owing to the fact that they are not found in the waters 
of the shores, and that, on the contrary, they resemble Mediterra- 
nean types. These two species have been provisionally described 
under the names of Vortex lemani and Mesostomwm morgiense, and 
probably belong to new genera. The latter, in particular, is cer- 
tainly not a true Mesostomum, but belongs to a family of Turbel- 
laria hitherto exclusively marine. These two forms, without 
analogues in the remainder of our fauna, are at the same time those 
which reach the greatest depth. They have only been found in a 
few other European lakes—as, for instance, in that of Starnberg, in 
Bavaria. 
The class Turbellaria is not, however, the only one which pre- 
sents facts of this kind. M. Vernet has found amongst the crusta- 
ceans of the deep fauna a form related to the genus Cythere, which 
is, as is well known, exclusively marine. M. Duplessis has himself 
remarked amongst the Arachnida of the lake two species which 
bear a striking resemblance to marine types. One is the Campo- 
gnatha Forelli, which so exactly resembles a small Campognatha of 
the Mediterranean shores, that at the first glance one might confound 
the two species. The other belongs to a singular genus, which also 
occurs in the mud of the Mediterranean. How can facts of this 
nature be explained? Perhaps we have here the last remains of 
a marine population, some types of which have accommodated them- 
selves to fresh water as the sea retreated. This, however, is a mere 
conjecture; and we all know how circumspectly we must venture 
upon this ground.— Bibl. Univ. Oct. 15, 1877, Arch. des Sciences, 
p. 326. 
Characters of a new Species of Dryops from Formosa (Coleoptera, 
Parnide). By Cuarres O. WATERHOUSE. 
The British Museum has recently received a small collection of 
objects of natural history from the island of Formosa. They were 
presented by Mr. Matthew Dickson; and among the Coleoptera I 
find a specimen of the genus Dryops which belongs undoubtedly to 
an undescribed species. I propose to name it 
Dryops Dickson. 
D. elongatus, griseo-flavescens, sericeus; thorace parum conyexo, 
disco medio leviter impresso, angulis posticis divergentibus, acu- 
tissimis ; elytris striatis. 
Long. 4 lin. 
