CHARACTERISTIC DEEP-SEA TYPES. — ACALEPHS. 131 
pointed conical bell, widening below into a funnel-shaped mar- 
gin, the upper and lower parts of the bell being divided into 
well-marked regions separated by a characteristic furrow. The 
margin is formed by a number of gelatinous blocks closely fitted 
together, which serve as supports for important organs called 
socles. These support tentacles, marginal sense bodies, and thin 
leaf-shaped lappets which have given the genus its name. The 
un ne 
Fig. 425. — Dodecabostrycha dubia. $- 
stomach hangs down from the under side of the bell, and in its 
spacious receptacles are found prominent filaments. The color is 
blue. The American species P. hyacinthina (Fig. 426) extends 
as far north as the coast of Greenland. 
None of these so-called deep-sea meduse, however, present 
such remarkable features as the species of Atolla. The genus 
has thus far been taken by the “Challenger” in the Antarctic 
Ocean, on the borders of the South Atlantic and South Indian 
