TITISCAXIA. 165 



Titiscania limacina BERGH in Semper's Reis. Archip. Phil. II, ii, 

 Heft ix, t. xli, f. 10 ; Morphol. Jahrb. xvi, p. 3. t. 1, 2. 



The coloration of the specimens from the Philippines is described 

 above. The specimens from Mauritius were mostly smaller (length 

 9, breadth scarcely 4, alt. 2-2], length of tentacle 1* mill.) the color 

 whitish, the entrails not showing through, with the exception of the 

 anterior female genital mass which conspicuously shows through. 



Explanation of figures, plate 41. 



Fig. 53. Anterior end of animal from below, showing front gill- 

 commissure with retracted gill, then tentacles, oral aper- 

 ture and sole of foot. 



Fig. 54. Anal papilla. 



Fig. 55. Alimentary canal. 



Fig. 56. The living animal, enlarged after a drawing by Semper. 



Fig. 57. Tentacle with eye. 



Fig. 58. Radula (xlOO). 



Fig. 59. a, Lateral tooth lying prostrate ; b. Three inner teeth of 

 the second row ; c. Two inner supporting plates. 



Fig. 60. Outer plates. 



Fig. 61. Innermost of the outer plates. 



Fig. 63. Outermost plate. 



Fig. 64. Outer end of a row of teeth. 



Fig. 65. A few teeth from the same. 



Plate 39, figs. 28, 29. Nerve ganglia. 



