x THE LIFE OF THE MOLLUSCA 



PLATE 



X. Various Forms of Shells in the Gastropoda 



Prosobranchia (T\enioglossa). 



XI. Various Forms of Shells in the Gastropoda 



Prosobranchia (Rhachiglossa). 



XII. Various Forms of Shells in the Gastropoda 



Prosobranchia (Toxoglossa), the Tecti- 



branchia, and of the animals of nudibranchia. 



XIII. Various Forms of Shells in the Pulmonata. 



XIV. A Worm-Eating Slug (Testacella scutulum). 



XV. Structure and Shell of the Scaphopoda 

 (Elephants'-Tusk Shells). 

 Various Bivalves, showing the Animals extended. 

 XVI. Topography of Bivalve Shells. 

 XVII. Various Forms of Bivalve Shells : Proto- 

 branchia and Filibranchia. 

 XVIII. Various Forms of Bivalve Shells : Eulamelli- 



BRANCHIA {A. OSTRACEA, B. SUBMVTILACEA, AND 



C. Tellinacea). 

 XIX. Various Forms of Bivalve Shells : Eulamelli- 



BRANCHIA (D. VENERACEA, E. CaRDIACEA, 



F. Chamacea, and G, Myacea). 

 XX. Various Forms of Bivalve Shells: Eulamelli- 



BRANCHIA (H. ADESMACEA AND 7. ANATINACEA) 

 AND SEPTIBRANCHIA. 



XXI. Cephalopod Structure and Form of Animal, etc. 

 XXII. Various Forms of the Shell in Cephalopoda 

 Tetrabranchia (Nautilus and Ammonites). 



XXIII. Restoration of Animal and Shell of Belemnites. 



XXIV. Forms of the Shell in the Belemnite and its 



Descendants. 

 XXV. Various Forms of the Animals and Internal 

 Shells of Cephalopoda Dibranchiata (Cuttle- 

 fish, Pen-and-Ink-Fish, and Octopus). 

 XXVI. Various Forms of Sea-Butterflies (Pteropoda) 

 and heteropoda, with shells of pelagic 

 Fry of Mollusca, and Surf-Dwelling Pul- 



MONATES, ETC. 



