THE MOLLUSCS OF THE OEEAT AFRICAN LAKES. 183 



DESCRIPTION OF PLATES 14—19, 



Illustrating Mr. J. E. S. Moore's paper on "The Molluscs of 

 the Great African Lakes.'^ 



Reference Letters, 



B.P. Brood-pouch, ce. (Esophagus, st. Stomach, ff.g. Genital gland. 

 g. d. Genital duct. g. v. External genital groove. Sp. d. Spermatic duct. 

 g. a. Genital aperture, os. Osphradium. rad. Radular sac. c. st. Crystal- 

 line style, r. Renal aperture, int. Intestine, ant. ch. Anterior stomachic 

 chamber, e.g. Cerebral ganglion. Sb. int.g. Subintestinal ganglion. Sup 

 int.g. Supra-intestinal ganglion, pi. Pleural ganglion, p. g. Pedal gan- 

 glion, pi. p. com. Pleuro-pedal commissure. C.p.com. Cerebro-pedal com- 

 missure, c.com. Cerebral commissure, x. Zygoueurous connection, a. 

 Anus. Int.g. g. Internal genital groove, d. Dyaloneurous connection. M.p. 

 e.g. Median process on cerebral ganglia. B.m. Buccal mass. F, «. Visceral 

 nerve. V.g. Visceral ganglion. V. d. Vas deferens. R-g. Rectal gland. 



PLATE 14. 



Fig. 1. — Shells of Tangany ikia rufofilosa, showing the character of the 

 operculum. 



EiG. 2. — Tanganyikia rufofilosa with the mantle cavity opened up so 

 as to show the relation of the mantle organs. 



Fig. 3. — The radular apparatus and upper portion of the nervous system of 

 rufofilosa. 



Fig. 4, — Dissection of the viscera of rufofilosa. 

 Fig. 5. — A single row of teeth from the radula of rufofilosa. 

 Fig. 6. — The stomach of rufofilosa, showing the anterior chamber and 

 crystalline style. 



Fig. 7. — The gills of Melania episcopal is; at a. the gill filaments 

 are simple and triangular, while at b. they have the filamentous character of 

 the Littorinoids. 



Fig. 8. — Right and left lateral views of the anterior portion of the 

 nervous system of rufofilosa. 



Fig. 9. — The large extremity of the intestine of rufofilosa, showing 

 rectal gland. 



Fig. 10. — Semi-diagrammatic view of the reproductive apparatus of the 

 female rufofilosa. 



