XIV CONTENTS. 



SECTIOS 



9. Organs of Secretion, 255-256 



I. Urinary Organs, 255 



II. Organs of Special Secretions, 256 



10. Organs of Generation, 257-261 



Introductory JVote to the Crustacea. 

 XII. THE CRUSTACEA. 



Classification and Bibliography, 262 



1. External Envelope, and Cutaneous Skeleton, 263-266 



2. Muscular System, and Organs of Locomotion, 267-269 



3. Nervous System, 270--273 



4. Organs of Sense, 274-277 



5. Digestive Apparatus, 278-281 



6. Circulatory System, 282-284 



7. Respiratory System, 285-287 



8. Organs of Secretion, 288-289 



I. Urinary Organs, 288 



II. Organs of Special Secretions, 289 



9. Organs of Generation, 290-294 



I. Hermaphrodite Crustacea, 291 



II. Female Crustacea, 292 



III. Male Crustacea, 293 



Xm. THE ARACHNOIDAE. 



Classiiication and Bibliography, 295 



1. External Envelope, and Cutaneous Skeleton, 296-397 



2. Muscular System, and Organs of Locomotion, 298-299 



3. Nervous System, 300-302 



4. Organs of Sense, 303-305 



5. Digestive Apparatus 306-308 



6. Circulatory System, 309-310 



7. Respiratory System, 311-313 



8. Organs of Secretion, 314-315 



I. Urinary Organs, 311 



II. Organs of Special Secretions, 315 



9. Organs of Generation, 316-320 



I. Hermaphrodite Ai-achnoidae, 317 



II. Female Arachnoidae, 318 



III. Male Arachnoidae, 319 



XIV. THE INSECTA. 



Classification and Bibliography, 321 



1. External Envelope, and Cutaneous Skeleton, 322-323 



2. Muscular System, and Locomotive and Soniferous Organs, 325-327 



3. Nervous System, 328-331 



4. Organs of Sense, 332-336 



5. Digestive Apparatus, 337-339 



6. Circulatory System, 340 



7. Respiratory System, 341-344 



8. Oi'gans of Secj'etion, 345-847 



I. Urinary Organs, 345-346 



n. Organs of Special Secretions, 347 



9. Organs of Generation, 348-355 



I. Female Genital Organs, 349-351 



II. Male Genital Organs, 352-354 



Index, 



