TABLE OF contents; 



ARTICLE I. Introduction. Tp. IG. 



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List of Officers of the Smithsonian Institution 



III 

 ix 



ARTICLE II. (242.) Lucernari.e and their Allies. A Memoir on the Anatomy 

 AND Physiology of Haliclystus Auricula and other Lucerna- 

 RiANS, WITH A Discussion of their Relations to other Acaleph.e, 

 TO Beroids, and Polypi. By Henry James Clark, B. S., A. B. 

 Published July, 1878. 4to. pp. 138. Eleven plates, 

 Part I. General and Comparative Morphology. 



CiiAl'TER I. Individuality ...... 1 



§ 1. Polarity and Polycephalism .... 1 



§ 2. The Ilydroid and Medusoid Cephalisms . . 4 



Chapter II. The Type of Form is not Radiate ... 7 



§ 3. The Dorso-ventrally Repetitive Type . . 7 



Chapter III. Antero-posterior (Ceplialo-caudal) Repetition . . 9 



§ 4. The Scyphostoma and Ephyra, varieties of the same 



morph ....... 9 



§ 5. Tlie Individuality of Pelagia and Lucernariai . 10 



Part II. Anatomy and Physiology of Haliclystus Auricula;. 



Chapter IV. General Form and Structure . . . .13 



§ fi. Habits, Habitat, Form, and Size . . .13 



§ 7. The Proboscis . . . . .16 



§ 8. The Umbella . . . . .17 



§ 9. The Peduncle ..... 23 



Chapter V. Organography ...... 2G 



§ 10. The Walls ...... 26 



§11. The Muscular System . . . .36 



§ 12. The Tentacles ..... 41 



§ 13. The Marginal Adhesive Bodies (Colletocystophora) 51 



§ 14. Tiie Caudal Adherent Disk . . .56 



§ 15. The Digitiform Bodies (Digitali) ... 57 

 § 16. The Digestive System . . . .60 



§ 17. The Nervous System . . . .63 



§ 18. The Reproductive System . . . .66 



Chapter VI. Embryology . . . . . .70 



§ 19. The Egg and the Spermatozoa . . .70 



§ 20. A Young Haliclystus Auricida, nearly ^\ of an indi 



in diameter ...... 72 



§ 21. A Specimen g\ of an inch across the LTmbella . 76 

 § 22. A Young Specimen j of an inch across. Special 

 Development of a Tentacle, a ( 'oUetocystophora, and a 

 Genital Sac . . . . . .81 



§ 23. Young, 1 of an inch across . . .90 



§ 24. Young, j'^j of an inch across . . .92 



Each memoir is separately paged and indexed. 



