92 THE OCEANIC HYDROZOA. 



In the second, the expanded end of the branch divides dichotomously (so as to resemble 

 one of the oral tentacles of a Bougainvillia), and a single large thread-cell is contained in the 

 end of each of the terminal branches. 



Of the third kind there is not one for ten of the others. The end of the branch enlarges 

 into a globular knot, containing many thread-cells, and sending out, at a right angle to the 

 axis of the branch, a firm, conical process. " It is composed of a few cells, and carries 

 on one side a coat of clear, muscular fibres, by means of which it is frequently set in motion, 

 being usually bent towards that side on which the muscular fibres lie, and then starting back 

 into its first position. 



"At the root of this beak-like process a great number of fusiform bodies are attached, 

 one end being buried in the organ, the other free. No motion was observed in them. 

 Their contents are finely granular and condensed towards the middle, where the outlines 

 of a nucleus are sometimes discoveral)le. The points are almost always clear and glassy." 



Fully developed sexual organs were found by Gegenbaur in none of the numerous 

 specimens which he examined. But he describes vesicular bodies seated on the cocnosarc 

 between the polypites, which he believes were their rudiments. He found, however, no trace 

 of either generative products or medusiform buds, so that the real nature of these organs 

 is still open to doubt. 



Lesson (' Acalephes,' p. 490) gives a figure of BMzophysa fliformis, to whose coenosarc, 

 spheroidal, granular masses are attached between the polypites. These he calls in the text 

 " paquets d'ovaries," and in his definition of the species these " paquets d'ovaries " are said to 

 be " jaunes." Nevertheless, in the figure they are of a lively pink hue! By way of making 

 the confusion perfect, Lesson praises Delle Chiaje's " description de cet Acalephe,'' which he 

 subjoins, and which obviously relates to a totally different animal. 



