26 Proceedings of the Royal Physical Society. 



together (PI. II. Fig. 2). Over all there is a wrinkled 

 appearance, with here and there a ring-like constriction 

 (PI. II. Figs. 1 and 2, a). These latter have no definite 

 distribution upon the tentacles, and appear, together with 

 the wrinklings, to be incidental to the state of contraction of 

 the organ. The consistency is gelatinous but firm, and the 

 tentacles are not readily broken. They bear no tentillpe or 

 specialised " urticating organs." Since the state of preserva- 

 tion is not particularly good, they were probably detached 

 from the parent organism some time before capture. This 

 is all the more probable, as they appear to be the only parts 

 of it which were found, and, judging by the great length of 

 the tentacles, a single colony is likely to be of considerable 

 size. 



Serial sections, both transverse and longitudinal, were 

 made, and these, though useful in illustrating the general 

 structure, have not been satisfactory as regards histological 

 detail. A reference to the figures, however, will show that 

 one or two points of interest have been made out. Plate II. 

 Fig. 3 is a transverse section. There is a marked general 

 resemblance between its appearance and that of a typical 

 stolon. The epidermis h, covering the minute elevations 

 already referred to, consists of masses of small rounded cells, 

 doubtless in part sensory, intermingled with which are 

 numerous stinging cells. These are the best preserved of all 

 the elements ; they are of large size, their long axis measur- 

 ing 25 /x. The coiled lasso is particularly well seen (see 

 PL II. Fig. 5). These cells were seen to be grouped in 

 " batteries " upon the papillae. Passing inwards from the 

 external layer, the ectodermal longitudinal muscle cells form 

 a series of radially directed bands. These bands are double, 

 and at their inner ends are widened out so as to form longi- 

 tudinal canals (c) of some size, and more or less folded. On 

 the walls facing the cavity of these canals are cells similar to 

 those of the outer layer (except cnidoblasts). From this it 

 appears not unlikely that the canals are formed by a folding 

 of the outer wall, from which they are shut in by the 

 apposition of the outer parts of the original folds. Plate II. 

 Fig. 4 is a longitudinal section through the region of these 



