GENERAL INDEX. 147 



Lens-like constituent of ocellus, 139. 



Lesson, his ' Ilistoiie Naturelle des Acalephes,' 14. 



Leuekart, his establishment of the group Coelenterata, 15; his union of gymnoiihtlialmic mcdusoe and 



hydroid trophosoraes into a single group; his group Ceratostera, 16. 

 Lewes, G. H., his observations on the functions of the thread-cells, 229; he maintains the occurrence of 



both adclocodonic and phanerocodonic gonophores in Afflaplicnia myrlophyllum, .304. 

 Linnajus, the researches of Ellis convinces him of the animality of the liydroids, 6 ; his binomial 



nomenclature, 6; his 'Systema Natura:',' state of hydroid zoology at the period of the publication 



of Gmelin's edition of it, 8. 

 Liriojic cathariensis, Fritz Miiller's account of its metamorphosis, 81. 

 Lithocyst, its structure and situation, 140; its function, 143. 

 Literal zone, its hydroid fauna and associated vegetation, 168. 

 Lizzia Kollikeri, development of the eggs in, 97. 

 Lizzia, alleged direct development from the egg, 100. 



Loven, his discovery of the meconidium ; his recognition of differentiated sex in the Hydroida, 147. 

 Lucernaria, diagnostic characters of the order, 188; comparison of, with Hydra, 197. 



M'Crady, his memoir on the Gymnophthalmata of Charleston Harbour, 17. 



Man, his agency in determining the distribution of the Hydroida, 159. 



Manubrium, 32. 



Margelis scarcely distinguishable from Bougainvillia, ■i\\,Hutc. 



Marsigli, the polypes of coral regarded by him as flowers, 5. 



Marsupial receptacle in Dipliasia (Seriularia) rosacea, 50 ; in Diphasia (Sertularia) fallax ; in Diphasia 

 [Sertularia) tamarisca, 52. 



Meconidia of the genus Gonothyr»a, 55. 



MecznikofT, his observations on the direct development of Cunina and Geiyonia from the egg, 100. 



Medusa, 32 ; development of, 76 ; homological parallelism between medusa and sporosac, 38 ; between 

 medusa and hydranth, 40; significance of the medusa in the life-series of the hydroid, 95; deve- 

 lopment of its eggs, 96 ; fossil hydroid medusae, 174 ; comparison of hydroid medusa with 

 Actinia, 195. 



Mediterranean province, 162. 



Melicertum campanula, development of egg in, observed by Alex. Agassiz, 97. 



Mertens, his observations and figures of medusae, 12. 



Mesotheca, 32. 



^letamorphosis of the Geryonidai and jEginidae, 80. 



Moebius, his observations on thread-cells, 120, note. 



Monocaulus glacialis, remarkable for the high northern latitude of its geographical area, as well as for its 

 deep bathy metrical zone, 396. 



Mona'cious colonies sometimes occur among the Hydroida, 148. 



Monopsea, a sub-order of liydroids, characters of this sub-order, 189. 



Morphology of the Hydroida, 21. 



Miiller, Fritz, his account of budding from the internal surface of the stomach in Cniiina Kulliktri, 83. 



Miiller, O. F., his ' Zoologia Danica,' 7. 



Myriothela, its development through Actinuloe, 94, 382. 



Nematophora, name of a sub-kingdom proposed by Huxley, 15. 



Nematophores, term proposed by Busk, their form, 28 ; their sarcode contents and action, 115. 



Nemopsis, the sexual lobes of its medusa, 63 and 361 ; its alleged free trophosome probably only a 



detached hydranth, 68 and 361. 

 Nervous system in the Hydroida, 137; Haeckel's researches on the nervous system in the Geryonida?, 



138. 

 New Zealand province, 162. 



Nomenclature of the Hydroida, how regulated, 237. 

 North Pacific province, 102. 



