630 
Proceedings of the Eoyal Society 
The generative system consists externally of a clitellum, occupying 
in one of the two specimens that I examined as many as nine 
segments. On this open the generative apertures, three pairs of 
which are situated close together in a sucker-like structure at the 
posterior end of the clitellum, upon which there is no development 
of glands ; each pair corresponds to one of the three segments, seven- 
teen, eighteen, and nineteen. The middle pair open into two large 
“ prostates ” ; no ducts were found in connection with the other two 
pairs. There is also a fourth pair of apertures on fourteenth seg- 
ment, with which again no ducts were discovered to be continuous. 
The testes are a pair of racemose glands occupying twelfth segment. 
Two pairs of fimbriated organs, occupying eleventh and tenth seg- 
ments, are perhaps the oviducts, or possibly the vasa deferentia. 
They open separately on the wall of the segment behind that in 
which they are situated. 
There are no segmental organs present. The vascular system 
presents no important differences from that of other worms. The 
dorsal and ventral vessels are connected by six pairs of hearts increas- 
ing in size from before backwards, and occupying from the eighth to 
the thirteenth segments inclusive. There appear to be no intestinal 
hearts (“ coeurs intestinaux” of Perrier), though the supra-intes- 
tinal vessel is present, and in that region of the body in which 
the hearts are developed is double. Capillaries extend into the 
hypoderm as in the leech, the fibres of the two muscular coats of 
the body wall as separated into smaller and larger bundles by a 
meshwork of fibrous connective tissue. The perivisceral cavity is 
put into communication with the exterior by a series of dorsal pores. 
3. Geological Notes. By Dr. Heddle. 
Leaf -bed in Ganna. 
Since the discovery, by His Grace the Duke of Argyll, of the 
“ Leaf-bed ” at Ardtun, in Mull, there has not, so far as I am aware, 
been another found throughout the whole of that extent of land and 
shore, where we might hope for such a discovery, among the Inner 
Hebrides. 
It was my good fortune to light upon one last summer. While 
