ANALYSIS OF THE LESSONS. XV11 



LESSON XXXIII. ORGANS OF NUTRITION IN THE ANNELLATA, . . . p. 118. 



550. Name of the class : how obtained. 551. Peculiarity of the class. 

 552. Respiratory organs most attractive. 553. Mode of action of these organs. 

 554. Their nutrimental organs. 555. Nutrimental organs of Aphrodita aculeata. 

 556. Mouth of the Leech. 557. Its oesophagus and stomach described. 558. 

 Army surgeons avail themselves of a peculiarity of the nutrimental canal. 559. 

 The common mode of treating leeches condemned. 560. A better plan pro- 

 posed : blood-sucking propensity in leeches- a curious phenomenon. 561. 

 Arenicola piscatorum^ its blood : respiratory tufts. 562. Its nutrimental organs. 

 563. Circulation of the blood. 



LESSON XXXIY. ORGANS OP NUTRITION IN THE EPIZOA, .... p. 122. 



564. The class described. 565. Mode of attachment of the Lernoea. 566. 

 The mouth and alimentary canal. 567. The nervous system : heart and circu- 

 lation of the blood. 568. The Ovaria described. 569. Disparity in size of the 

 sexes : the male illustrated. 



LESSON XXXY. ORGANS OF NUTRITION IN THE CIRRIPEDIA, . . . p. 123. 



570. Many of them parasitic : Tubicinella. 571. Meaning of their name. 

 572. Superior protection of the visceral mass. 573. The common Barnacle de- 

 scribed. 574. The sessile Cirripeds. 575. The structure of a Lepad explained : 

 their branchiae. 



LESSON XXXYI. ORGANS OF NUTRITION IN THE CRUSTACEA, . . . p. 125. 



576. General description of the class. 577. Their breathing organs. 578. 

 Their skeleton described. 579. The power of locomotion of the Lobster. 580. 

 The mouth : position of the gills. 581. Mouth, oesophagus and stomach de- 

 scribed. 582. Their gastric teeth. 583. The alimentary canal. 584. Aorta 

 and pulmonary vein : nervous system. 585. The venous sinuses. 686. They 

 occupy the place of veins : extent of these sinuses. 587. Casting their claws 

 (Lobsters) explained. 588. Difficulty of demonstrating these sinuses. 



LESSON XXXVII. ORGANS OF NUTRITION IN INSECTS, p. 128. 



589. General description of the nutrimental canal in animals. 590. Modi- 

 fications to which it is liable. 591. Its structure in Insects. 592. Length of 

 their intestines. 693. The several parts into which they are divisible. 594. The 

 salivary glands. 595. The parts described not always present. 596. The bile 

 vessels. 597. The pharynx. 598. The oesophagus. 499. Mode of separation 

 from the stomach. 600. The pumping stomach. 601. More fully explained. 

 602. The proventriculus. 603. The stomach. 604. The duodenum. 605. The 

 ileum. 606. The colon. 607. The coecum. 608. The biliary vessels. 609. The 

 salivary glands. 610. Principles of classification. 611. The Linnean system. 



LESSON XXXVIII. NUTRITION IN INSECTS, CONTINUED, p. 132. 



612. The Linnaean system exemplified. 613. The structure of the mouth in 



