117 
Mr. R Ellis Cunliffe brought before the Section’s 
notice a copy of the first volume of the “ Challenger” ex- 
pedition. 
Mr. Plant, F.G.S., exhibited a glass bottle filled with 
large black ants from Baltimore, U.S.A. They were all still 
alive, though somewhat torpid. 
Mr. James Cosmo Melvill, F.L.S., exhibited some very 
curious forms of fresh water mollusca from Lake Tanganyika, 
Central Africa, which had been collected in 1879-80 by Mr. 
E. Coode Hore, of the Central African Mission. Mr. Edgar 
A. Smith, of the Zoological Department, British Museum, 
had described the new species ; and it was found necessary 
to create three new genera for as many species, in the case 
of Tiphobia Horei, Neothauma Tanganyicense, and Syrno- 
lopsis lacustris. The first of them, T. Horei, is the most 
remarkable fresh water mollusc yet discovered. It bears 
more resemblance to the marine Gasteropod Murex Bran- 
daris, or Tudicla spirillus, than to any fresh water genus, if 
we except the strange Melaniad Io spinosa, and its allies. 
The animal and operculum of Tiphobia being yet unknown, 
it is placed provisionally by Mr. Smith among the Melaniadae. 
Neothauma Tanganyicense is, perhaps, only a Paludina. 
there are certain peculiarities about the lip, however, which 
show affinity with the Melaniadge, and the texture of the 
shell is not so light as most of the Paludinge. It resembles 
P. umbilicata from Siam, and P. Ingallsiana from Japan. 
Specimens of these and other close allies were exhibited. 
Syrnolopsis lacustris, a small elongate Melaniad, with flexu- 
ose lip, calls for no especial remark. 
Mr. Melvill also exhibited several other shells, most of 
them new species of Lake Tanganyika shells, but none of 
them new genera, eg., Spatha Tanganyicensis (Smith), 
