172 



Papers from the Department of Marine Biology. 



the sting of this medusa is very severe and may even be fatal to man. The 

 Dactylometra of the Philippines is also a dangerous form, but Lobonema, which 

 some of the members of the Albatross expedition believed to be virulent, is not 

 capable of inflicting a very severe sting (see Light, 1914, Philippine Journal of 

 Science, vol. 9, pp. 291-295). 



The following is a record of specimens of Chiropsalmus quadrigatus obtained 

 by the Albatross in the Philippine Islands: 



Genus PERIPHYLLA Steenstrup, 1837. 



Periphylla, STEENSTRUP, 1837, Acta et Cat. Mus. Hafniensis. MATER, 1910, Medusa of the 

 World, vol. 3, p. 543. BROWNE, 1910, National Antarctic Expedition, vol. 5, Medusae, p. 42. 



GENERIC CHARACTERS. 



Coronatse with 4 interradial rhopalia and 12 tentacles, 4 perradial and 8 

 adradial. 16 marginal lappets grouped into 4 pairs of rhopalar and 4 pairs of 

 tentacular lappets. A deep annular furrow separates the dome-like apex of 

 the exumbrella from marginal zone of bell. Between this ring-furrow and the 

 lappets is a zone of 16 pedalia, 12 in the tentacular and 4 in the rhopalar radii, 

 and these are separated one from another by 16 deep, radiating clefts, which 

 extend down the mid-axial lines of the lappets. There are 4 deep, interradial 

 subgenital pits in the floor of the subumbrella, lined above their edges by rows 

 of internal gastric cirri. The large central stomach extends peripherally out- 

 ward into the subumbrella in the 4 perradii. These 4 openings lead into a 

 wide ring-sinus in the subumbrella, which in turn sends out a radiating vessel 



