Fig. 77. 
Fig. 670. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
78. 
81. 
82. 
83. 
84. 
89. 
86. 
64. 
66. 
ELEDONE. 573 
Median vertical longitudinal section ot arm, 
showing the ganglion and group of nerves, 
which supply each sucker. 
Diagrammatic longitudinal section through 
two ova, showing their mode of attachment to 
the germinal wall, and also numerous folds of 
the follicle, which nourishes the developing 
ovum. In left hand corner is a diagram of 
an ege in transverse section, showing the 
infolded follicular membrane. 
IPPApH OX: 
Diagram of median vertical section of eye. The 
whole optic ganglion is drawn in order to show 
the relation of the retinal nerves to the retina 
and ganglion. ‘The small figure on the left 
shows the outer segment of the lens, from the 
surface which rests on the cornea. x 2. 
Diagram of the parasite Dicyema miller, found 
in the kidney fluid of Hledone cirrosa. Much 
enlarged. 
Anterior region of visceral envelope, from inner 
surface, showing posterior membranous wall 
9 
of brain case, and various nerves. x 2. 
Hye from external surface, showing hd and 
pseudocorneal membrane. ~~ l. 
Median dorso-ventral section through eyelid 
and pseudocorneal membrane. x 1. 
(a) Cranial and orbital cartilages, from dorsal 
surface. (b) The same, ventral view. x 4. 
Vertical section through portion of the retina. 
Dorso-ventral section through olfactory pit, 
much enlarged, showing the folded sensory 
wall. 
Right olfactory pit; mantle turned back. x 1. 
