436 
CHARLES L. BOULENGER. 
developed at the bases of the youngest ones (the so-called 
marginal tentacles). 
We see then that L. tanganicse shows traces, not only of 
the tentacle-bulbs of the Rhodesian species, but also of a 
similar arrangement of the marginal sense-organs ; I think it 
highly probable that it has been derived from some medusa 
bearing distinct basal bulbs which carry the sense-organs. 
It seems the custom for writers on Limnocnida to make 
some remarks on the systematic position of this peculiar type 
of jelly-fish. Unfortunately the structure of the new species 
does not shed much light on the difficult problem of the 
affinities of this genus ; the similarity in the arrangements of 
the marginal sense-organs of L . rhodesiae and certain 
species of Olindias is perhaps significant, since there seems 
a tendency amongst recent writers on the subject to ignore 
the manubrial position of the gonads of Limnocnida and to 
place the genus together with Limnocodium close to the 
Olindiadae among the Trachymedusae. 
Birmingham, 
December 11th, 1911. 
Bibliography. 
1. Martens, E. von, and Bohm, R. — “ Uber eine Qualle im Tanganyika 
See, mit Bemerkungen,” ‘ Sitzber. Ges. Naturf. Fr. Berlin,’ 1883, 
p. 179. 
2. Gunther, R. T. — “ Preliminary Account of the Fresh-water Medusa 
of Lake Tanganyika,” ‘ Ann. Mag. Nat. Hist.,’ ser. 6, vol. xi, 
p. 269, 1893. 
3. “ A Further Contribution to the Anatomy of Limnocnida 
tanganyicse,” ‘ Quart. Journ. Micr. Sci.,’ vol. 36, p. 271, 1894. 
4. Guerae, J. de. — “ On a Medusa observed by Dr. Tautain in the 
River Niger at Bamakou (French Soudan),” ‘ Ann. Mag. Nat. 
Hist.,’ ser. 6, vol. xiv, p. 29, 1894. 
5. Moore, J. E. S. — ‘ The Tanganyika Problem,’ London, 1903, p. 298. 
0. Gravier, C. — “ Sur la Meduse du Victoria Nyanza,” ‘ Comptes 
rendus Acad. Sci. Paris,’ vol. cxxxvii, p. 867, 1903. 
7. Goto, S. — “The Craspedote Medusa Olindias, and some of its 
natural Allies,” ‘ Mark Anniversary Volume,’ New York, 1903, p. 1. 
