JUN Le 1896 
The Blood of Magelona. 
By 
W. Blaxland Benham, D.Sc.Lond., Hon. M.A.Oxon., 
Aldrichian Demonstrator in Comparative Anatomy in the University of Oxford. 
With Plate 1. 
THe small Annelid first discovered and briefly described by 
Fr. Miller! in 1858 has more recently received more elaborate 
treatment at the hands of Professor W. M‘Intosh.? It presents 
several peculiarities deserving of still more detailed research ; 
and, at Professor Lankester’s request, Dr. M‘Intosh has kindly 
sent to me from time to time living specimens, obtained at St. 
Andrews, which have served as the starting-point of my own 
observations. 
Amongst these peculiarities, the most striking and astonishing 
is afforded by the contents of the blood-vessels ; and I propose 
at present to limit my remarks to an enumeration and descrip- 
tion of the observations and experiments which I have made 
on this fluid. 
In order to obtain a greater quantity of quite fresh material 
I spent a week at the Marine Laboratory at St. Andrews 
during the summer of 1894. Professor M‘Intosh was good 
enough to send me a list of low tides—at which time only can 
Magelona be obtained in any considerable number. My 
very hearty thanks are due to Dr. M‘Intosh for his permission 
to make use of the laboratory and appliances for the purpose 
1 Fr. Miller, “ Hiniges iiber d. Annelidenfauna d. Insel 8. Catharina,” &c., 
‘ Arch. f. Naturgesch.,’ 1858, p. 211. 
2 W. C. M‘Intosh, “ Beitrage zur Anat. von Magelona,” ‘Zeit f. wiss. 
Zool.,’ 31, 1878. 
VoL. 39, PART 1.—NEW SER. A 
