MISCELLANEOUS. 69 



sometimes seated on the branches singly, or six or seven in a row, but 

 without occupying any uniform or determinate position. I do not recol- 

 lect the occurrence of vesicles on any of the ascidian zoophytes, nor have 

 I been able to ascertain the nature of the substauces in question. One 

 seemed full of dark triangular objects ; some are shaped like a cup, but 

 the general form is ovular. 



This product appears always as a parasite, profusely dispersed over 

 other zoophytes. However, it is very seldom to be found alive, in a 

 suitable state, and, above all, in a proper position for delineation. 



Plate XIX. Fig. 8. Crisia eburnea. 



9. Another specimen. 



10. Portion of fig. S, enlarged. 



11. Portion of a specimen with hydrse. 



12. Hydra enlarged. 



13. Hydra enlarged. 



Figures 8, 9 of this Plate natural size, the rest are 

 enlarged. 



6 8. Coryna glandulosa — Hermia glandulosa, Dr Johnston. 



Plates XXI., XXII. — It is difficult to discover why former naturalists, 

 in general, should have approximated this zoophyte to the hydraoid zoo- 

 phytes, for there is no immediate relation between them : as little can it 

 be associated with the ascidian tribes, from which its position is equally 

 distant. In fact, there is none of this country, known to me, bearing it 

 any kindred. The most prominent feature distinguishing it, from all others, 

 is the absence of hydrse, which precludes its reception, as much as that of 

 sponges, among the race of zoophytes, with which naturalists are familiar. 

 Yet the Coryna glandulosa is capable of exercising certain active func- 

 tions, though nothing to be compared with the part which is borne by that 

 most essential part of organization, the hydra?, belonging to so many genera 

 of the lower animated products. I have had a number of specimens, 

 undergoing careful examination, also, at all times. Therefore, I can only 

 say, that the product, which at present seems to be entirely sui generis, 

 may have exposed to others what I have unsuccessfully sought. 



It is one of the smaller zoophytes, rising about an inch in height, by 



