. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . he Lubomirskince, the Tanganyikaform would have to be removed from that sub-family as atpresent defined. Consequently, I venture to suggest thatthe sub-family Lubomirskin:e should be abolished and thespecies contained in it placed under the Spongillinae, whichthen could be arranged into a number of genera accordingto the character of their megascleres. THE TANGANYIKA PROBLEM. 123 POTAMOLEPIS WELTNERI, MOORE. With respect to this ctirious form nothing more can at pres
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . he Lubomirskince, the Tanganyikaform would have to be removed from that sub-family as atpresent defined. Consequently, I venture to suggest thatthe sub-family Lubomirskin:e should be abolished and thespecies contained in it placed under the Spongillinae, whichthen could be arranged into a number of genera accordingto the character of their megascleres. THE TANGANYIKA PROBLEM. 123 POTAMOLEPIS WELTNERI, MOORE. With respect to this ctirious form nothing more can at present be said than thatit is a sponge growing in the deep water of lake Tanganyika; that in the singlespecimen obtained it appears as a thin brown encrustation on a Paramelania shell ;that it has thick, slightly curved spicules which, unlike those of Potaiiiolepis leiib-iiitziiv, are slightly swollen at the ends, and that in general the enlarged ends ofthese spicules are micropunctate. It should, however, be noted that the character-istic spicules of this new form are closely similar to those of the old fossil Fig. —Spicules of Potautolepis Ueltiieii. PROTOZOA. With respect to the unicellular organisms which are foundin Lake Tanganyika, I have encountered only two formswhich seem to call for any special mention. It may beremembered that, in Livingstones diary of his last journey,the explorer noticed that at times the surface of Tanyganyikawas at tinies covered with what he called a yellow scum,and which, he says, he thought to be of vegetable origin. 21* 324 THE TANGANYIKA PROBLEM. I have encountered this scum repeatedly on the lake, theclear green for miles appearing as if tinged with a tinegolden dust, the minute particles of which this is composedreflecting the bright sunlight, like the crystals of someyellow precipitate. Upon examination these yellow clouds were found toconsist of a large infusorian which at first sight lookedexactly like aperidinitun, ha
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