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THE VOYAGE OF H.M.S. CHALLENGER. 



0. SensilljE. Sense Organs. Sinnesorgane. 



o Corpuscuhi marginalia. Marginal hodies. Randkorper. 



Sense organs of various kinds, placed for the most part on the umbrella margin ; 

 organs of feeling, smelling, hearing, and seeing ; sometimes single, sometimes united into 

 sense clubs, &c. The essential sensitive part of all organs of sense always consist of variously 

 differentiated ectodermal cells, whilst the endoderm cells may also have a share in the 

 formation of the subordinate parts. 



P. Pedunculus. Peduncle. Schirmstiel. 



p Processus cupularis. Apical process of the umbrella. Scheitel-Avfsatz des Schirms. 



Conical or pyramidal aboral process of the umbrella, sometimes prolonged into a long 

 cylinder or a quadrangular prism, homologous to the peduncle of the gonophores. The 

 peduncle is sometimes fixed at the end (in the sessde Lueernaridse), sometimes pointed 

 and free (in the swimming Codonidaa, Tesseridse, &c). 



Centraler Axenrauni des Schirmstiels. 

 Basis des Schirmstiels. 

 Rippen des Schirmstiels. 

 Rinnen des Schirnistiels. 

 Spitze des Schirnistiels. 



Q. Exoderma. Ectoderm. Hautblatt. 



2 Ectoderma, Epiblast, Deivnalblatt, 



Lamina dermalis. Outer germinal layer. Acusseres Kcimblatt. 



The external primary germinal layer, corresponding to the external simple germinal 

 layer of the gastrula (or the non-invaginated half of the blastula). In the Medusae this 



