PLATE IIL 



Fig. 80. '^ Desmoptcrits' sp. Aboral view. 10 X. 



Fig. 81. Same specimen. Oral view. 10 x. 



Fig. 82. Cyinbulia peroni de Blainv. from Naples. Large specimen. Oral view. 2 X. 



Fi". 83. Empty shell of the same specimen, from the right. a, b, c, three rows of spines; the first of these 



rows only reaches the ventral point. Some spines at the aperture are very large. 2 X. 

 Fig. 84. Same shell, aboral view. 2 ■ . 



Fig. 85. Another specimen of Cyinbulia peroni de Blainv., from the same locality. 2 X. 

 FiCT. 86. Empty shell of the same specimen, from the right. The row a only exists. 2 X. Spines at the 



aperture of equal size. 

 Fig. 87. Same shell, aboral view. 2 • . 

 Fig. 88. Cyinbulia sibogae n. sp. Oral view. 2 X- 

 Fig. 89. Same specimen, from the right. 2 X. 

 Fig. go. Same specimen, aboral view. 2 /. d, a row of spines, which (according to Pelseneer's figure at 



least) does not reach the middle of the shell in Cyinbulia parvidcntata. 

 Fig. 91 — 93. Three specimens of Cyinbulia, without shell. See text. Figs. 91, 93: 2 v'. Fig. 92: 5 X. 

 Fig. 94. Pallial gland of Cyinbulia peroni de Blainv. Aboral view. d, v, dorsal, ventral margin, a, b, first 



and second transparent band. 

 Fig. 95. Dorsal view of the accessory genital glands of Cyinbulia peroni de Blainv. a, efferent duet of the 



gonad; b, muciparous gland; c, albuminiparous gland; d, receptaculum seminis; /, vas deferens. 

 Fig. 96. Central nervous system of Cyinbulia peroni de Blainv., ventral view. 



a, anterior pedal commissure; p, pedal ganglion; v, left visceral ganglion; p.v., posterior visceral 



ganglion; i, nerves to the fins; 2, left pallial nerve; 3, right pallial nerve; 4 and 5, visceral 



nerves; ot, otocyst. 

 Fig. 97. The same, from the left. Explanation of letters the same as in the foregoing figure. Besides, 



c, cerebral ganglion ; 6, tentacular nerve, 7 and 8, nerves to the proboscis. 

 Fig. 98. The same, oral view. Explanation of letters the same as in figs. 96 and 97. Besides, 9 and 10, 



pedal nerves, perhaps supplying the retractor muscle of the proboscis. Nerves to the fins are 



not figured. 

 Fig. 99. Distribution of the nerves in the fins of Cyinbulia peroni de Blainv. 



