1907-8.] Oligochsets found on the Scottish Loch Survey. 
21 
II. — Notes on some Oligochaets found on the Scottish Loch 
Survey. By C. H. Martin, B.A. (Magdalen College, Oxford). 
Communicated by Sir John Murray, K.C.B. (With Plates I., II.) 
(MS. received April 3, 1907. Read May 20, 1907.) 
These notes deal mainly — 
(1) With the structure of the genital organs of Stylodrilus Gabretece 
(Vejd.), and with its possible identity with Bathynomus Lemani (Grube). 
(2) A new species of oligochset ( Stylaria Lomondi). 
I owe my opportunity of working on these forms to Sir John Murray, 
whom 1 must again thank for his great kindness. 
The Genital Organs of Stylodrilus Gabretece. 
Stylodrilus Gabretece (Vejd.) is one of the most characteristic deep- 
water oligochaets occurring in Scottish lakes. In nearly every haul from a 
depth of more than a hundred feet, if the bottom is composed of soft mud, 
one or two specimens of this species, with its cocoons (generally empty), will 
almost certainly be found. 
It occurs sporadically on muddy bottoms in more shallow waters, and on 
two occasions in Loch Lomond, near Tarbet, I found it in about four feet 
of water. 
The anatomy of the immature form has been described by Vejdovsky in 
his great work upon oligochsets, but as I do not know any account of the 
anatomy of the sexual organs in the mature form of any species of this 
genus, I have thought it well to give some description of them. 
The genus is readily identified amongst the Lumbriculids by the absence 
of the characteristic blind cseca to the blood-vessels, and by the presence 
of long non-retractile penes. 
I find that, as regards the external anatomy, I cannot add anything 
material to Vejdovsky ’s description, “ Lebhaft rosaroth von 3-4 cms. lang 
mit einfach und gegabelten borsten. Der Kopflappen konisch zugespitzt 
langer als das mund Segment. Die Penis-rohren beinahe der lange als die 
Querachse des Korpers beitragt.” 
Although I had found Stylodrilus commonly in Loch Tay in 1905, it 
