44 DISCOVERY REPORTS 



beside it, or sometimes one on each side of it. The accompanying diagram (text-fig. 8) shows an 

 example of the arrangement of the tentacles in a quadrant of a specimen 14 mm. in diameter; the 

 figures denote the number of nematocyst clusters in each tentacle. The dwarf tentacles on the 

 per radial and interradial swellings are always to the left of the root of the corresponding large tentacle 

 when seen from the exumbrellar side. 



Text-fig. 8. Gossea hrachymera. Diagram of one-quarter of the umbrella margin, showing the arrangement of large 

 and small tentacles. The figures denote the number of nematocyst clusters in each tentacle. 



The number of large and small tentacles in specimens of various sizes are shown in the following 

 table : 



It will be seen that the relative numbers of large and small tentacles are subject to considerable 

 variation, whereas the total numbers are not very variable, being 88-102, average 91, in specimens of 

 more than 13 or 14 mm. in diameter. Apparently, therefore, the final number is attained when the 

 medusa is about 13 mm. wide. It will also be seen that in specimens 12-14 mm. wide there are more 



