. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . e. p. g. Diagram showing at a and/; the arrangement of the genital grooves and brood pouch inTanganyicia rufoftlosa and Mclania episcopalis. Compared with the opisthohranchAuricula c. g. v., Genital groove, h- p., Brood pouch, e. p., evertable penis. i8* 276 THE TANGANYIKA PROBLEM. ing of the halolimnic gastropods, Nassopsis, we find our-selves confronted with a type of organisation which, from amorphologists point of view, is at once important andunique. Th
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . e. p. g. Diagram showing at a and/; the arrangement of the genital grooves and brood pouch inTanganyicia rufoftlosa and Mclania episcopalis. Compared with the opisthohranchAuricula c. g. v., Genital groove, h- p., Brood pouch, e. p., evertable penis. i8* 276 THE TANGANYIKA PROBLEM. ing of the halolimnic gastropods, Nassopsis, we find our-selves confronted with a type of organisation which, from amorphologists point of view, is at once important andunique. The radula of this form is somewhat Hke that ofthe genus Vivipaja, but it is much more closely similarto that of a number of Littorinas; in like manner, thenerves are arranged upon a plan which at once recalls themore primitive types of the Prosobranchiata and even theRhipidoglossa themselves. To make this quite clear, Iwould, in the first place, point out that if we consider thedisposition of the anterior ganglionic masses in the differentgroups of the Prosobranchiata, we find that in all the formsof the Rhipidoglossa, both diatocardiat
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