34 THE VOYAGE OF H.M.S. CHALLENGER. 



with isolated complete ones. It is probable that, here and there, the one mesentery 

 of a pair is formed, the other arrested. I was compelled to relinquish the determina- 

 tion of the number of the mesenteries, in order to spare the specimen. 1 counted, 

 however, the number of tentacular papillae, amounting to fifty-three ; some of these, in 

 the neighbourhood of the single siphonoglyphe, were very small. I infer from this 

 that increase of the number of the tentacles was not yet concluded. 



III. Edwardsi^. 



Family 11, Edwardsid^e. 



Genus Edwardsia. 



Edwardsia, sp. (?). 



Habitat. — Station 168, July 8, 1874 ; 1100 fathoms. One specimen. 



The sole example of the genus Edwardsia which I met with in the Challenger 

 material, and which came from a depth of 1100 fathoms, was so strongly contracted 

 that the capitulum was concealed within the scapus, and in the posterior section was so 

 completely crushed that it was difficult to detect the rounded hinder pole. 



The surface is extraordinarily rough and bark-like, probably in consequence of an 

 incrustation of mud on the cuticular layer ; at the anterior end the entrance to the 

 mouth is visible, and round it are eight radial furrows, which, owing to the indifferent 

 preservation, could be followed only for a short distance upon the body-wall. The 

 opening is slit-like ; the wedge-shaped regions bounded by the furrows at the anterior 

 pole are dissimilar in size, and are so arranged that the broadest is at one end of the 

 slit, the smallest at the other, while the remaining six are symmetrically arranged right 

 and left. At the posterior end of the animal, only seven of these furrows, which 

 correspond to the mesenterial insertions, can be recognised. 



I attempted to investigate the structure further by means of transverse sections, 

 but was reluctantly forced to the conviction that nothing remained of the mesenteries 

 and stomatodseum. 



IV. Zo ANTHER. 



As the result of researches instituted by G. von Koch and myself, I have in my 

 former Eeport separated from the hexamerous Actiniae, the shar2)ly marked group of the 

 Zoanthese, and have described as their representatives the genera Siihenoinis, Zoanthus, 

 and Epizoanthus. 



I conceived it to be eminently inapjiropriate that such discordance should exist 

 in the nomenclature of the individual species and genera of Zoanthese, a discordance 



