BY R. VON LEN'DENFELD, PH.D. 97") 



are found on the sensitive pole and on the mouth-margin of Neis. 

 I have in vain looked for ganglia-cells below the style-cells and I 

 cannot find any notice in literature that below these the ganglia- 

 cells are more numerous than elsewhere, which must necessarily be 

 the case if these cells really are sensitive. 



I think, therefore, that I am justified in assuming that these 

 styles are jjoison thorns and not sensitive bristles. Accordingly I 

 suppose the glands surrounding these cells to be poison glands. The 

 position of these elements in the Beroids and still more in Cestus 

 and Eucharis appears to me to prove conclusively that they are 

 defensive weapons which represent the thread cells. 



In detail it is true that such an analogy cannot be traced, but 

 the outer similarity in the arrangement, form and chemical behaviour 

 with regard to re-agents which exists between these organs and 

 the nettle-epithelia of other Ccelenterata is very striking. 



The style-cells are often drawn out into a continuation down- 

 wards. This can just as easily be taken for a peduncle as for a 

 nerve. And even were we to ascribe nervous functions to these 

 style-cells, the other functions mentioned above might co-exist 

 therewith. The recurved sabre-formed cilia of the stomach-epithel 

 do not show any essential difference with the hooked teeth in Beroe. 



The Color. 



The Gallert and Epithelia are colorless, only those cells which 

 cloth the vascular reticulation, especially when the animal contains 

 ripe sexual cells, are slightly rose-coloured. Below the surface 

 of the narrow sides there is a beautiful orange red reticulation 

 formed by pigment cells. Just below the surface the threads 

 of this reticulation are very thick, and are spread out tangen- 

 tally. Fine radial ramification extend from this surface-net 

 in a centripedal direction pervading the Gallert. This can be 

 traced for a distance of about 8 mm. The meshes of this 

 pigment reticulation are smallest just below the surface between 

 the paddle-ribs, so that in the middle of the narrow side an 

 indistinct orange stripe is produced. The yellow pigment is 

 wanting on the ends of the narrow sides in the vicinity of the 



