4, EDWARD T. BROWNE. 
14 specimens with 1 colleto-cystophor with a capitate tentacle. 
15 ” 2 39 ” » 
15 ” 3 ” ” 9 
9 ” 4: ” » ” 
se) 5 ” oy) 23 
5 9 6 ” » ” 
4 ” 7 9 » ” 
8 » 8 ” ” ” 
I searched all the Plymouth specimens to see if a similar 
variation existed, and only found one doubtful case. This 
specimen (figs. 7 and 8) has seven groups of tentacles in the 
normal position and one group a little way inside the oral sur- 
face of the umbrella. The proper position of this group is 
occupied by a capitate tentacle with a swollen base, which may 
or may not be an abnormal colleto-cystophor. The specimen 
possesses the usual eight colleto-cystophors, normal in shape 
and position. 
Two specimens have capitate tentacles on the margin of the 
umbrella in an abnormal position. One has three tentacles 
just above a double colleto-cystophor (figs. 4 and 5), and the 
other has three tentacles close to a colleto-cystophor (fig. 10). 
I think the Jersey specimens give an excellent illustration 
of local variation of a species. 
The Variation of the Genital Bands.—In a normal 
specimen there are eight adradial genital bands, separated into 
four distinct pairs by the interradial septa. Some specimens 
show a variation upon this arrangement. One specimen (fig. 9) 
has six adradial and two interradial genital bands. The change 
in position occurs through the union of two adjacent adradial 
groups of tentacles into one interradial group. This union has 
reduced the number of groups of tentacles and colleto-cysto- 
phors to seven, but the genital bands remain normal in number, 
The change in position of the two genital bands is also well 
shown by their being separated by an interradial septum 
occupying its normal position. I think this may be regarded 
as a good case of congenital variation. 
Another specimen (fig. 6) has six adradial and two perradial 
genital bands, There are seven groups of tentacles. One 
