OF THE CCELENTERATA. 253 



(47.) Gegenbaur. — 'ZuY Lehre vom Generationswechsel und der 

 FortpflanzuDg bei Medusen und Polypen,' 1854. 



(48.) .— 'Versuch eines Systemes der Medusen, mit 



Beschreibung neuer oder wenig gekannter Formen,' Z. W. Z. 

 1857. 

 (49.) M'Crady.— ' Gymnophthalmata of Charleston Harbor,' Ell. Soc. 

 Proc. 1857 : and the systematic papers of Peron et Lesueur, 

 Ann. d. Mas. 1809-10; Brandt, Petersb. Mem. 1833 and 38; 

 and LuTKEN, Videns. Med. 1850 ; with other memoirs by 

 Aloian (Structure of LucernariadjE), Q. J. M. S. i86o'i 

 Milne Edwards (Structure of vEquorea) (67), and (Circu- 

 lation in Lucernaridaj), A. S. N. 1845; Derbes (Hermaphro- 

 ditism of Chrysaora), Ann. S. N. 1850; KoLLiKER (Medusidje 

 of Messina), Z. W. Z. 1853; Leuckart (Medusidje of Nice), 

 Wiegm. Arch. 1856; Fritz Muller (Gastric filaments of 

 Lucernaridffi), Z. W. Z. 1858; Eysenhardt (Rhizostoma) 

 Nov. Act. 1821; and Tilesius (Cassiopeia). Nov. Act. 

 1831. 



On Structure of Marginal Bodies see especially Gegenbaur, 

 Arch. Anat. 1856 (or English abstract in Q. J. M. S. 1858). 



On Minute Structure of Medusidaj and Lucernaridos, vid. Busk, 

 Mic. Trans. 1852; Schultze, Arch. Anat. 1856; and Hux- 

 ley (46), 



Ou Structure of Charybdeid^e : Milne Edwards (Charybdea), 

 Ann. S. N. 1833 ; and Fritz Muller (Tamoya), Halle Abh. 

 1859. 



On Development of Medusidse: J. Muller (^ginopsis). Arch. 

 Anat. 1851 ; Gegenbaur (Cunina and Trachyneraa), (47); 

 Fritz MIjller (Liriope), Wiegm. Arch. 1859; M'Crady 

 (Cunina), Ell. Soc. Proc. 1856; and Clapar^de, Z.W. Z. 

 i860. 



On Development of Lucernarid£e : Sars (21), Isis, 1833, and 

 Wiegm. Arch. 1837-41 and 1857; Siebold, Beitrage zur 

 Naturgeschichte der Wirbellosen Thiere, 1839; Steenstrup 

 (24); Dalyell (9); Desor, Ann. S.N. 1849; and Reid, 

 ' Physiological, Pathological, and Anatomical Researches,' or 

 A. N. H. 1848. These writers treat chiefly of Aurelia, Cyanea, 

 and Chrysaora. For the development of other genera see 

 Gegenbaur (Cassiopeia), (47); Frantzius (Cephea), 

 Z.W.Z. 1853; and Krohn (Pelagia), Arch. Anat. 1855 (or 

 English abstract in A. N. H. 1856). 



