JELLY-FISHES. 



103 



structure the axis is enlarged into a bag-like inflation. There is, however, a well- 

 developed nectostem and two series of nectocalices as in Agalma. Around the cir- 

 cumference of the inflation, which takes the place of the polypstem, the tasters with 

 their short, tentacular filaments are arranged side by side. The polypites and sexual 



ITiG. 95, — Physopliora hydrostatica. 



bodies are found below these structures. No tru« covering-scales exist in the genus 

 Physophora. 



One of the largest of all the Physophorss is the genus Apolemia, the type of 

 the Apolbmiad^, which is called by the Italian fishermen by the suggestive name of 

 " lana di mare." In this beautiful Siphonophore we have, as in other float-bearing 

 medusse thus far considered, a double Vow or series of nectocalices, but unlike the 

 last mentioned genera, there arises from the nectostem, small bodies resembling 



