308 EXPLANATION OF THE PLATES. 



FIGURE. PAGE. 



83. Section of oral mass of Triton nodiferum, Lam. (Kefer- 



stein.) o, mouth ; rd, radula ; Kf\ jaw ; y^ opening 

 of the oesophagus ; pp, tongue jDapillas ; oe, oesophagus ; 

 sch, tongue sheath ; kn., tongue cartilage, . . 95 



Plate 16. 



84, 85. Male of Argonauta Argo, Linn. (After Mliller.) In 



85 the hectocotylized arm is enveloped in the sack, 

 and in 84 it is developed. Figures magnified about 

 three times, ....... 31,111 



86. Female organs of Sepia officinalis. (Milne-Edwards, in 

 Cuvier's Regne Anim.) a, anus; r, intestine; ov^ 

 ovary ; od' , oviducal aperture ; ocZ, oviducal gland ; 

 g^w, nidimental gland; grn', accessory glands, . . Ill 



8*7. Female oi'gans of Bledone moschata. (Keferstein.) ocZ, 



oviducal apertures; x^ oviducal glands; ou, ovary, 111 



88. Acinus of the hermaphrodite gland of Cymbulia Peronii, 



Cuvier. (After Gegenbauer.) o, ovules placed at the 

 periphery ; s, spermatic elements, . . . .122 



89. Pja'ula tuba. Lam. Female. Proboscis withdrawn, a, 



anus ; i;, vagina ; y^ mucous gland ; t), stomach ; *, 

 intestine ; od, oviduct ; /?., liver ; ou, ovary ; oe, alimen- 

 tary canal ; tyic^ columellar muscle ; &r, branchiae ; r, 

 kidney; s, respiratory siphon. (Keferstein.) . .116 



90. Male organs of Sepia officinalis. (After Duvernoy.) ^, 



testis ; vd^ vas deferens ; us, vesicula seminalis ; pr, 

 prostate ; ft.fp, spermatophore reservoir ; p, penis 

 and genital aperture, . . . . . .111 



91. Pyrula tuba, Lam. Male. Proboscis extruded, pr, 



proboscis ; vd, vas deferens ; vd' , sperm grove ; t^ 

 testicle ; p, penis ; s, respiratory siphon ; &r, branchiae ; 

 a, anus ; ?/, mucous gland ; r, kidney ; ^, intestine ; 

 o, heart. (Keferstein), . . . . . .116 



92. Anterior end of spermatophore of Sepia officinalis, Linn. 



Greatly magnified. (Keferstein), . . . .111 



Plate It. 



93. Egg-capsules of Murex pomum, Gmel. Original, . 119 



94. A capsule of Purpura lapillus,L. (After Keferstein.) . 119 



95. Nidus of Natica, reduced one-half. Original, . . 124 



96. Capsules of Littorina littorea, with developed young, . 119 



97. Nidimentary ribbon of Doris Johnstoni, Alder and 



Hancock, 123 



98. Group of capsules of Purpura lapillus, Linn. (After 



Keferstein). ..,,.... 



