OF THE CCELENTERATA. 253 



(47*) Gegenbaur. — 'Zur Lehre vom Genera tionswechsel und der 

 Fortpflanzung 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. Mus. 1809-10; Brandt, Petersb. Mem. 1833 and 38 ; 

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

 Allman (Structure of Lucernariadae), Q. J. M. S. 1860^ 

 Milne Edwards (Structure of ^Equorea) (67), and (Circu- 

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

 ditism of Chrysaora), Ann. S. N. 1850; Kolliker (MedusidaB 

 of Messina), Z. VV. Z. 1853; Leuckart (Medusidas of Nice), 

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

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



Nov. Act. 1 82 1 ; 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 Medusidaa and Lucernaridaa, vid. Busk, 

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

 ley (46). 



On Structure of Charybdeidaa : Milne Edwards (Charybdea), 



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

 1859. 



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

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

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

 (Cunina), Ell. Soc. Proc. 1856; and Claparede, Z. W. Z. 

 i860. 



On Development of Lucernaridaa : 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, 

 i 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). 



