430 Proceediiujs of the Royal Physical Society. 



supra-intestinal vessel and lateral hearts is practically 

 identical with that just described, except that the two halves 

 of the dorsal vessel do not unite together at the point where 

 they traverse the mesenteries. Fig. 3 represents a small 

 portion of the intestine, together with the dorsal vessels and 

 the principal branches, of which there are two pairs in each 

 segment ; one pair is given off close to the mesentery, and is 

 concerned with its blood supply, while the other exclusively 

 supplies the intestinal walls. 



Fig. 1 is an illustration of the principal trunks of the 

 vascular system in Microchceta, and it will be observed that 

 in this earthworm as in Lumbricus all the hearts are given 

 off directly from the dorsal vessel. 



Explanation of Plate. - 



c?= Dorsal vessel. 



-yr: Ventral vessel. 



5. -y.zr Supra-intestinal vessel. 



7i= Heart. 



m=Mesenter3\ 

 Fig. 1. Circulatory system of Microchceta in anterior part of body. 

 Fig. 2. Circulatory system oi Acantliodrihts, sp. 



Fig. 3. A small portion of the intestine of a second species of AcantJiodrilus, 

 showing the completely double dorsal vessel. 



XXXV. Notes on the Birds of the Island of Eigg. By William 

 Evans, Esq., F.E.S.E. 



(Read 21st January 1885.) 



The list of the birds of the island of Eigg, which I pro- 

 pose laying before the Society this evening, has been prepared 

 under the following circumstances. 



Being desirous to gain some knowledge, from personal 

 observation, of the habits of the Manx shearwater at one of 

 its breeding stations, as well as to obtain with my own hands 

 a specimen of its Qgg, I landed on the island on the after- 

 noon of the 19th of June last, — having crossed from Arasaig 

 in a fishing-boat, — and remained till the morning of the 24th 

 June, when I left in the ss. " Claymore " for Oban. 



When I went to Ei<:]j(? I had no intention of making a list 



