xv i ANALYSIS OF THE LESSONS. 



foliatca 4S1 Epithelium on serous membranes. 482. Two nuclei found iri 

 one cell. SEROUS AND SYNOVIAL MEMBRANES.-483. Their structure. 484. 

 Closed sacs : their contents. 485. Where found. 486. Serous membranes 

 invest abdominal viscera. 487. Synovial membrane: its description: where 

 found. 488. Burs mucosffi. 



LESSON XXIX. ORGANS or NUTRITION, p. 97. 



489. Examination of stagnant water by the microscope : its revelations. 

 490. Plurality of digestive sacs. 491. Probably this description is erroneous. 

 492. Characters of the Rotifera. 493. Arrangement of their vibratile organs. 

 494. Remarkable tenacity of life. 495. Habitat of ENTOZOA. 496. Description 

 of them. 497. The Acephalocyst. 498. Description of it. 499. Two species 

 of them : mode of multiplication. 600. The Ccenurus cerebralis. 501. The 

 "gid," or mad-staggers in animals: what produces it. 502. Description of 

 Coanurus. 603. Hydatids have no sex. 604. Echinococcus hominis : descrip- 

 tion of it. 505. Cysticercus celluloBa. 506. Where found. 607. Tania solium, 

 or Tape-worm, described. 508. Distoma : two species of them. 509. Distoma 

 kepaticum, described. 610. J)istoma lanceolatum, described. 611. Parasites of 

 the Pig, enumerated. 



LESSON XXX. ORGANS OF NUTRITION, CONTINUED. POLYPI, ... p. 103. 



612. General description of them. 513. Marine Polypes. 514. Freshwater 

 Polypes enumerated and described. 515. Habits of the Hydrse. 516. Their 

 simplicity of structure. 617. Mode of reproduction by budding (gemmation), 

 and cutting them. 618. Marine Polypes. 519. Corallium rubrum. 520. What 

 becomes of the nutriment. 521. Nutritive organs of C. rubrum described. 



LESSON XXXI. ORGANS OF NUTRITION IN ACALEPHA, p. 106. 



522. General description of the Acalepha. 523. Perorfs description of them. 

 524. Our present information of them. 625. Rhizostoma Cuvieri, described. 

 526. Cetonia aurita, described. 



LESSON XXXII. ORGANS OF NUTRITION IN THE ECHINODERMATA, . . p. 109. 



627. The characters which distinguish them. 528. Their digestive apparatus. 

 529. Nutrimental organs of Asterias. 530. Ccecal apparatus. 631. Echinida 

 explained and described. 532. Description of the teeth : salivary follicles. 533. 

 Cavity of the " lantern of Aristotle," Pharynx, (Esophagus, &c. 534. The heart 

 described. HOLOTHURIA. 535. Description of them. 536. The mouth : tenta- 

 cula. 637. Their teeth. 538. The oesophagus and stomach of H. elegans. 539. 

 The branchiae (gills). 540. Spontaneous rupture of the integument in Holothuria. 

 641. Caused by great muscular irritability. 542. The tendinous chords. 543. 

 Cucumaria frondosa. 544. The sexes distinct: the ova. 545. Great fertility 

 of Holothuria : the ovarium. 546. The respiratory organs described. 547. 

 Intestines terminate in the cloaca. SIPUNCULUS. 548. Rough Syrinx, or Tube- 

 worm. 649. Description of it. 



