OF THE CCELENTERATA. 251 



(a8.) Thomson', At.len. — *0n the Co-existence of Ovigerous and 



Spermatic Capsules on the same individuals of the Hydra 



viridis,' Phil. Journ. 1847. 

 (29.) EcKER. — 'Zui' Lehre von Bau und Leben der contractilenSub- 



stanz der niedersten Thiere,' Z. W. Z. 1849 (or Trans, by Busk 



in Q.J, M. S. 1854). 

 (30.) Jager. — ' Ueber das spontane Zerfallen der SUsswasserpolypen 



nebst einigen Bemerkungen iiber Generationswechsel,' Vien. 



Sitz. i860: and other memoirs cited in Bib. Zool., especially 



those of Allman, Cokda, Laurent, Leydig, and Rouget. 



The British species of Hydra are described by Johnston (op. 



s. cit.), and Lewes, A. N. H. i860. 



b. CORYNID.E AND SeRTULARID^. 



(31.) Loven. — 'Beitrag zur Kenntniss der Gattungen Campanu- 

 lariaund Syncoryne,' Wiegm. Arch. 1837. (Abstract in Steen- 

 strup) (24). 



(32.) Beneden, Van. — ' Memoire sur les Campanulaires de la cote 

 d'Ostende, conside'res sous le rapport physiologique, embryo- 

 genique et zoologique.' Bruss. Mem. 1843. 



(33.) , . — 'Recherches sur I'embryogenie des Tubulaires 



et I'histoire naturelle des diffe'rents genres de cette famille qui 

 habitent la cote d'Ostende,' Bruss. Mem. 1844. 



(34.) ScHULTZE, Max.—' Ueber die mannlichen Geschlechtstheile 

 der Campanularia geniculata,' Arch. Anat. 1850 (or Trans, in 

 Q. J. M. S. 1855). 



(35.) Mummery.— ' On the Development of Tubularia indivisa,' 

 Q. J. M. S. 1853. 



(36.) Allmax.— ' On the Anatomy and Physiology of Cordylophora,' 

 Phil. Trans. 1853. 



(37.) . — ' On the Structure of the Reproductive Organs in 



certain Hydroid Polypes,' R. S. E. Proc. 1857-8; and 'Ad- 

 ditional Observations on the Morphology of the Reproduc- 

 tive Organs in the Hydroid Polypes,' ibid. 1858, 



(38.) — 'Notes on the Hydroid Zoophytes,' A. N. H. 1859 



et seq. 

 Other memoirs on the reproductive organs and development of 

 these orders are those of Dujardin, Ann. S. N. 1843 ^^^ 45 '» 

 Desor, Ann. S. N. 1849; Forbes, A. N. H. 1844; Lister, 

 Phil. Trans. 1834; Koli.ikkr, Z. W. Z. 1853; and Krohn, 

 Arch. Anat 1843 and 53, Wiegm. Arch. 1851. Also, the 



