57 ü Chas. W. Hargitt 



with tliese intercstiug organs. To this author's g-raphic description 

 of them (op. cit. p. 225), it is iinnecessary to add. In l)ut few par- 

 ticulars do my own observatious differ in anv material respect froni 

 liis. In the first place my specimens have not shown the abrupt 

 ends of tlie tentacles which he has figured. As will be uotieed from 

 the figure already cited, the tentacles usually have attenuated distal 

 portions as shown. Agaiu the body of the tentacles is more or 

 less roughened or rugose, due to the irregulär projections of the 

 ectoderm cells in pseudopod-like processes. And finally I have not 

 been able to observe the peculiar vibratory shimmerings of the pe- 

 dunculated nematocyst capsules to which he has referred. In re- 

 peated observations directed to the detection of just this phenomenon 

 I have as offen failed to distinguish it. Possibly it is only an 

 occasionai phenomenon, arising perhaps under special conditions 

 which may not have been present in the case of my specimens, or 

 })0ssibly it may be lacking entirely in some cases. I am in full 

 accord with Allman as to the essentially 'sarcodal' nature of the 

 l)eduncles of the nettling organs, as well as to their irritability and 

 eontractility. It seems to me that the rugose appearance of the 

 tentacles is likewise due in part to essentially the same ectosarcal 

 activity of the cells of the ectoderm, which seem to thrust out and 

 retract pseudopod-like processes of varying shapes and sizes and 

 in part to the nettling organs with which they are studded. Vesi- 

 cular cavities in the eutoderm of the tentacles are frequently to be 

 Seen, within which are exhibited exquisite displays of Brownian 

 activity among minute pigmentary grauules. The same pheuomena 

 also occur in the irregularities of the Avalls of the radial canals. 



As will be Seen in figure 29, there is an oval capsular enlarge- 

 nient arising at each perradius of the margin just over the radial 

 canal, containing large nematocyst?, the cnidocils of which may be 

 Seen as bristling projections from the outer surface. Usually those 

 of the perradii hearing the tentacles are larger than those of the 

 others. 



The medusae are very transi)arent except for the brownish 

 color of the manubrium, the delicate brownish pigment of the radial 

 canals, and the reddish orange pigment of the basal bulbs of the 

 tentacles. 



The earlier reference herein to the medusae of this species 

 observed by di I'lessis, which seemed peculiar in having four mar- 

 ginal tentacles, recalls the fact tliat the medusa originally describcd 



j 



