25 
1907-8.] Oligochsets found on the Scottish Loch Survey. 
He remarks, further, that “ ruckengefass dass jederseits eine reihe 
aeste absendet macht sich weniger bemerkbar. 
“ An der Bauchwand des etwa IX segment, scheinen kurze blind 
Schlauche zu munden ” (possibly the penes). 
In a footnote to another paper read before the same Society in 1879 
Grube remarks that during a second stay of two days on Lake Geneva he 
found on a new specimen that the dorsal vessel “ besitzt auch noch paarige 
kurzere blind endende aeste,” and he changed the name from Bathynomus 
to Bythonomus. 
It is rather remarkable that he should have overlooked in his first paper 
these usually very conspicuous structures, which are so characteristic of 
all Lumbriculids except Stylodrilus. 
Since this time no one has, as far as I am aware, been able to identify 
this form. 
Michaelsen has since revived the name for a genus, of which a character- 
istic feature appears to be the relation of the gonads. But as Grube never 
described the gonads in his account of this form, it seems somewhat diffi- 
cult to understand on what grounds this identification is based. 
I think that the most feasible assumption is, that the form which Grube 
found so common in Lake Geneva, and which he described in his first 
paper, must have been a Stylodrilus, and that it was a form of some other 
Lumbriculid genus in which he observed the blind contractile vessels of his 
second account. 
Stylaria Lomondi. 
This worm was found on three occasions in August 1906 near Tarbert, 
O 7 
Loch Lomond, on a soft muddy bottom at a depth of 12-20 feet. 
At this season chains of two zooids were found, also some single 
individuals in a sexually mature condition. From its naked-eye appear- 
ance this worm might readily be mistaken for a rather stout Stylaria 
lacustris (Linn.), but directly it is examined under a low power, several 
important differences are noted. The prostomium is well developed, and 
is prolonged into a proboscis, which, however, is never as long as in 
Stylaria lacustris, and there are two dorsal eyes. 
The most distinctive feature is, however, furnished by the structure 
and arrangement of the chsetae. The four anterior segments, as in Stylaria 
lacustris, have only ventral bundles composed of 6-7 sigmoid notched 
chsetae (fig. 4). 
The dorsal bundles are all alike, and contain 12-14 very fine capilliform 
chsetae, which possess a very characteristic fan-shaped arrangement. The 
