428 
CHARLES L. BOULENGER. 
gratulatiug Mr. Thomas on his most interesting discovery, I 
should like to take this opportunity of expressing to him my 
appreciation of the great trouble which he has taken in his en- 
deavours to send well-preserved material back to this country. 
Altogether four medusas reached me in sufficiently good 
condition for investigation; of these two were almost com- 
plete, the other two fragmentary, each being represented by 
a sectant of the umbrella to which a portion of the manubrium 
was attached. 
All the specimens were mounted in formalin in cells ringed 
with gold size. 
A mere glance at these medusae is sufficient to show that 
they belong to the very remarkable genus Litnnocnida, of 
which the only known species, L. tanganicae, 1 was dis- 
covered by Bohm (1) in Lake Tanganyika in 1883, and for a 
complete description of which we are indebted to R. T. 
Gunther (2, 3). The medusa was at first thought to be 
peculiar to this lake, and the halolimnic theory of the origin 
of Lake Tanganyika was based, at least in part, on its 
presence there. 
Since that time Limnocnida tanganicae has been found 
in the Victoria Nvanza (6, 10) 2 and in the River Niger (8, 9), 
and Mr. Thomas’s discovery ot a similar jelly-fish in a tribu- 
1 In this, as in a previous paper (12) on the Tanganyika jelly-fish, I 
have adopted Giintlier’s amended version of the spelling of the specific 
name of this medusa. When describing Dr. Cunnington’s collection in 
1907 (10), he remarked — “ This would seem an appropriate occasion for 
advocating a more reasonable uniformity in the spelling of this specific 
name ; and although in my original paper I had followed Bohm’s spelling, 
tangany icae, in accordance with the laws of priority, in the present 
communication the more usual and shorter form tanganicae is 
adopted. I have noted tanganyicae, tanganicanus, tanganicensis, 
tanganyikae, tangany icensis, tanganikae, and in Sollas’s ‘ Age of 
the Earth,’ p. 209, tangany icoea ! ” E. T. Browne (9) has also adopted 
the revised spelling, but I notice that A. G. Mayer, in his monograph on 
the medusae (11), uses the form tanganjicae. 
2 Gunther was able to detect distinct features in the Victoria Nyanza 
specimens, which he regarded as sub-specific in importance ; he pro- 
posed for these the name L. tanganicae var. victoriae. 
