20 Edward T. Browne. [No. 4 



from wliose basis in the bottom of the umbrella eight radial canals 

 pass out (4 perradial and 4 interradial). These bear the sac-shaped 

 genitalia in their proximal half, which are fastened to the sub- 

 umbrella by the leaf-shaped mesogonia just mentioned . . . The 

 eight genitalia or reproductivc glands hang in the proximal halves 

 of the eight radial canals, as visible sacculations from it." 



The specimens in this collection show that there are two kinds 

 of tentaeles; one series witli terminal suckers, and another series 

 of ordinary tentaeles without suckers. 



The "sucking cups" described by Haeckel are nothing more 

 or less than the roots of the tentaeles which have been broken off, 

 and the „short stalked suckers" are simply the tentaeles which have 

 been broken off not quite so close to the margin. These sucking 

 cups are easily produced by breaking off a tentacle. Unfortunately 

 not one of the specimens has a perfect series of tentaeles on the 

 umbrella-margin and they have suffered nearly as much as those 

 described by Haeckel. After examining the margin of all the 

 specimens it was possible to make up nearly a complete series. 



The tentaeles are arranged in numerous groups (about 48) 

 round the margin of the umbrella. Each group is somewhat tri- 

 angular in shape and projects outwards from the margin (fig. 6) 

 Haeckel calls them ..sucking plates". There are two kinds of 

 tentaeles in these groups arranged in a definite position. At the 

 upper end are three filiform tentaeles (without suckers' (fig. 6. T.). 

 which when broken off show a triangular disc, which Haeckel 

 figures as sucking cups. The lower part of each group is occupied 

 by a variable number of small tentaeles with terminal suckers (fig. 

 6 Su.) and when these are broken off they show small circular discs, 

 It is only these tentaeles with suckers that have been described and 

 figured by Haeckel. 



Between every two groups of tentaeles there is on the outer 

 side of the umbrella margin a large isolated triangular disc (fig. 6. 

 T'), the base I presume of "a large filiform tentacle. I have not 

 found a tentacle in this position on any of the specimens and be- 

 lieve that they have all been broken off. Allman in his account 

 of Ptychogastria polaris describes and figures these isolated tentaeles, 

 but I found none present on the type specimen. Haeckel in his 

 description of Ppdanthis asteroides which he captured alive off Pola 

 in the Adriatic Sea states that this medusa has two kinds of ten- 

 taeles; one with terminal suckers, the other filiform with the end 



