ANATOMY OF LIMNOCNIDA TANGANYICZ. 271 
A Further Contribution to the Anatomy of 
Limnocnida tanganyice. 
By 
R. T. Gunther, B.A., 
Lecturer of Magdalen College, Oxford. 
With Plates 18 and 19. 
THE present paper is the result of a more minute examina- 
tion of the same material on which my preliminary account of 
Limnocnida was based. Having already treated in my 
previous paper of the more obvious characters of the Medusa, 
I have endeavoured to avoid needless repetition in the present. 
The material had been caught and fixed in osmic acid by Mr. 
A. Swann on the shores of Lake Tanganyika itself, and reached 
me in a good state of preservation in strong alcohol, as already 
mentioned in the preliminary notice. 
The present work was carried out in the new Morphological 
Laboratory at Oxford during Lent term, 1893; and I have to 
express my sincere thanks to the President and Fellows of 
Magdalen College for enabling me to pursue my studies in 
Oxford, and also to Professor Ray Lankester for all the faci- 
lities which he afforded me while working in his laboratory. 
The following account of Limnocnida is divided into three 
sections. The first is devoted to the description of certain 
parts of the anatomy of the Medusa, and the arrangement 
adopted by O. and R. Hertwig in their ‘ Organismus der 
Medusen’ has been followed in the main. The second and 
third parts deal with the systematic position of Limnocnida 
and the origin of fresh-water Medusz respectively. At the 
VOL. 36, PART 2,—NEW SER. T 
