ON A FRESHWATER MEDUSA FROM RHODESIA. 437 
8. Browne, E. T. — “On the Freshwater Medusa, Limnocnida 
tanganicse, and its Occurrence in the River Niger/’ ‘ Ann. Mag. 
Nat. Hist.,’ ser. 7, vol. xvii, p. 304, 1906. 
9. “ On the Freshwater Medusa, Limnocnida tanganicse, 
discovered in the Biver Niger by the late J. S. Budgett,” ‘ The 
Work of John Samuel Budgett,’ Cambridge, 1907, p. 471. 
10. Gunther, R. T. — “ Zoological Results of the Third Tanganyika 
Expedition, conducted by Dr. W. A. Cunnington, 1904-5 : Report 
on Limnocnida tanganicse, with a Note on the Sub-species 
from the Victoria Nyanza,” ‘ Proc. Zool. Soc., London,’ 1907, 
p. 643. 
11. Mayer, A. G. — ‘ Medusse of the World,’ Washington, 1910, vol. ii, 
p. 369. 
12. Boulenger, C. L. — ** On some Points in the Anatomy and Bud- 
Formation of Limnocnida tanganicse,” ‘ Quart. Journ. Micr. 
Sci.,’ vol. 57, p. 83, 1911. 
13. Annandale, N. — “ The Occurrence of a Freshwater Medusa 
(Limnocnida) in Indian Streams,” ‘Nature,’ lxxxvii, August, 
1911, p. 144. 
EXPLANATION OF PLATE 42, 
Illustrating Mr. C. L. BoulengePs memoir “ On a Freshwater 
Medusa from Rhodesia.” 
List op Reference Letters. 
ex. Exumbrellar surface of the umbrella, m. Mouth, man. Manu- 
brium. n. Nucleus of an ovum, new. Nematocyst. nern.b. Nemato- 
cyst battery on a tentacle, n.r. Nettle-ring. o. Ovum. ov. Ovary at 
the base of the manubrium, pap. Papilla of ectoderm bearing the 
nematocyst battery, r.c. Radial canal, s.o. Marginal sense-organ. 
tent. Tentacle, tent. b. Bulbous swelling at the base of a tentacle. 
v el. Velum. 
Fig. 1. — The manubrium of a young individual of Limnocnida 
rliodesise, to show the contracted oral extremity and the four radial 
canals given off proximally. ( x 45.) 
Fig. 2. — A small portion of the umbrella-margin of L. rliodesise, 
showing the distinct tentacle -bulbs, which bear the sense-organs at their 
bases near the origin of the velum. ( x 45.) 
