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



section it gave the impression of a disintegrated epithelium, in longitudinal it resembled 

 a loose connective-tissue. This layer is important as containing small, spherical, deeply- 

 staining cells, which I regard as young ova. The masses of ova are in parts so con- 

 siderable as to present the appearance of mosaic, if part of the wall of the genital tube 

 be cut out, stained, and viewed from the surface (fig. 2). Next comes the second zone 

 of mesoglcea, the layer of most importance, since ova of various sizes are embedded in 

 it. Some of these are certainly connected with the superficial epithelium ; this con- 

 dition, I believe, occurs in all ova, and is effected by the fibre-arrangement characteristic 

 of Actinian ovaries, of which remnants only could here be detected (fig. 1). 



The lumen of the tube was mostly filled by a cell-detritus, but at some points was 

 lined by a clearly ciliated epithelium (figs. 4, 6) ; I reckon therefore the lumen as a 

 ciliated canal, serving for the transit of ripe ova and perhaps also of embryos, and 

 opening to the exterior outside the oral disc. The ripe ova appear to lie on the floor of 

 the tube, since here I found compact masses of a finely granular substance, appearing 

 to me to resemble ova. 



As to the distribution of the ova in the genital tube, I have the following facts to 

 add : the smaller ovules are met with in sections through the upper part of the tube, 

 forming a ring, on the one side of which the generative elements are more closely 

 packed than on the other. This lop-sided development of sexual cells is expressed 

 more obviously lower down, where on one side of the section they are entirely 

 wanting, the ripening ova being only present in the other half. 



With regard to the connection of the genital tube with the body of the Actinia, I 

 have arrived at no positive results. At the pore, the organ merely perforates the oral 

 lip without being attached to it, as I can assert both from macroscopic dissection and 

 transverse sections ; while at the lower end I have discovered no intimate connection 

 with the mesentery ; what I saw there was only an epithelial adhesion, not a transition 

 from the mesoglcea of the mesentery into that of the genital tube. Such a connection, 

 however, must certainly occur at this point. 



From my description it may be recognised that Aulorchis is one of the most 

 interesting Actiniae, and that it would be very desirable that a richer material of it 

 should be acquired by fresh Deep Sea investigations. 



Family 7, Phellid.e. 



Genus Phellia, Gosse. 



Phellia spinifera, n. sp. (PI. II. figs. 8, 9). 



The bark-like part of the body-wall is bedecked with thorn-like pointed knobs, 

 distributed more richly on the upper than on the lower parts. 



