: 12. 



CONTENTS 



INVERTEBRATE ANIMALS 



CHAPTER VIII. — Stone-Lilies, Star-Fishes, Sea-Urchins, and Sea-Cucumbers, — 



Subkingdom Echinodermata. 



PAGE 



Characteristics of the Group — Distinction of the Classes — Mode of Life — The Cystids (Class 

 Cystidea) — The Stone-Lilies or Crinoids (Class Crinoidea) — The Blastoids (Class Blas- 

 toidea) — The Star-Fishes (Class Asteroidea) — The Brittle Stars (Class Ophiuroidea) — 

 The Sea-Urchins (Class Echinoidea) — The Sea-Cucumbers (Class Holothuroidea) — De- 

 velopment of Echinoderms, ........ 289 



CHAPTER IX. — The Molluscs, or Shell-Fish, — Subkingdom Mollusca. 



Definition of the Group — Growth — Coloration — Age — Reproductive System — Food — Organs 

 of Sense — Locomotion — Uses in Natiu-e and to Man — Ni >xious Molluscs — Distribution — 

 < llassification— Squids, Cuttle-Fishes, and Nautili (Class Cephalopoda) — Characteristics 

 — Two-Gilled Group (Order Dibranch iota) — Octx ipns Tribe (Octopodidce) — Other Families 

 — Argonautidce — Suborder Decapoda — Squids (Loliginidce) — SepioKdce — OnychoU uth idee 

 and Chiroteutkidce — The Cuttle-Fishes (Sepiidce) — Spirulidce — Four-Gilled Group (Order 

 Tetrahra adnata) — Xautilida: — Allied Families, ...... 320 



CHAPTER X. — The Molluscs, — continued. Class Gastropoda. 



Distinctive Features of Gastropods — Lung-Breathing Group (Order Pulmonata) — Suborder 

 Stylommatophora — Shelled Slugs (Testacellidce) — True Slugs (Limacidoe) — The Snail 

 Tribe (Helicidce) — Other Families — Suborder Basommatophora — Earlet Shells (Awri- 

 eulidee) — Pond-Snails, etc. {Limnceidce, Physidw, and Chilinidcc) — Hind-Gilled Group 

 (Order Opisthobranchiata) — Naked-Gilled Subgroup (Suborder Nudibranchiata) — Sec- 

 tion Anthobranchiata — Doris Tribe (Doridopsidce, Doridce, etc.) — Section Inferobranchiata 

 — Section Polybranchiata — Section Pellibranchiata — Section Parasita — Covered-Gilled 

 Subgroup (Suborder Tectibranchiata) — Suborder Pteropoda — Sections Gymnosomata and 

 Thecosomata — Front-Gilled Group (Order Prosobranch iota) — Suborder Pectinibranchiata 

 — Section Toxoglo.ssa — Cones (Conidce) — Auger- Shells (Tcrehrida) — PleurotomidcB — 

 ( 'a iirellariidce — Section Rhachiglossa — Olives (Olividce) — "H&Tpa(Harpid(c)—M«r<ji>n Uida: 

 — Volutes (Volutidce) — Tulip-Shells {Fasciolariidce)— Concb-Sbells (TurbinelUda ) 

 Whelks (Buccinidce)- -Dog- Whelks (Nassidcv)— Dove-Shells (ColvmbelMdce)— Murices 

 {Murieidce) — Section Tcenioglossa — Tritons (TritonidcB) — Tun-Shells (Doliida) — Cowries 

 (Cyprceidas)— Wing-Shells (Strombidos) — Cerithiidce— Worm-Shells ( Vermetida) Mt Ian 

 iidce — Strepopomatida' — Periwinkles (Littorinidce) — Rissoidce — Hydrobiidce — Viviparous 

 Pond-Snails( Viviparida ) - Valvatid<e—A mpuUariidfe—Cyclo-phoridir—Cyrl<>4»iitatidti 

 TruncateUid/B — Hipponychidce—Calyptra ida Xi nophoridoe—Naticidce — Section Ptt no- 

 glossa— Violet Snails (lanthinida)— Wentle-Traps {Scalariidas) Section Gyrtmoglosm 

 Eulimidce — Pyramidellidce — Suborder Hcteropoda — Pterotracheida — Atlantidce- Sub- 

 order Scutibranchiata — Section Rhipidoglossa — Helia nida — Nt ritidce — Turbinida — 



