CONTENTS. 



PAET I. 



CHAPTEE I. 





On the Position" of the Mollusca ix the Animal Kingdom. 

 — Characters of the five primary groups, or suh-kingdoms : — 

 Vertebrata — Mollusca — Annulosa — Coelenterata — Protozoa. 

 Their antiquity 1—3 



Glasses of Mollusga. — 1. Cephalopoda. — 2. Gasteropoda. — 



3, Pteropoda. — 4. Brachiopoda. — o. Lamellibranchiata ... 3 — 7 



Halits and Economy of the Molli'Sca. — Sedentary tribes, their 

 mode of attachment ; locomotive tribes, their means of pro- 

 gression ; situations fi-equented by shell-fish. — Food : vege- 

 table, infusorial, and animal feeders. — Use of shell-fish to 

 other animals for food; imsq of shells for ornamental and 

 other purposes ; prices of shells.-^Longevrfcy of molluscous 

 animals; tenacity of life ; fecundity; oviposition 7 — 15 



STRrCTVrvE AND PHYSIOLOGY OF THE MoLLrSCA. ISTcrVOUS 



system ; organs of sense. — Muscular system. — Digestive 

 system ; lingual teeth ; secretions. — Circulatiag system ; 

 aquiferous canals.*— Eespiratory system. « — The shell, its 

 composition and -structure ; nacreous, fibrous, and i)orcel- 

 lanous shells ; epidermis ; erosion of fresh- water shells. — 

 Formation and growth of the shell ; adiilt characters ; de- 

 collated shells ; monstrosities ; colour's ; the operculum ; 

 homologies. — Temperature and hybernation. — Eeproduction : 

 of lost parts ; by gemmation ; viviparous ; alternate ; o^-ipa- 



rous. — Development »^ 15 — 45 



Classification. — Affinities; analogies; species; genera; families; 

 the quiaary system ; synonyms ; authorities ; types ; abbre- 

 Yiations 45 — 49 



912: 



