528 



MEDUSiE OF THE WORLD. 



somewhat longer than the bell-height and with 4 longitudinal, interradial strands of muscle- 

 fibers. Bell-margin divided by 8 clefts or notches, the 4 perradial ones being about twice as 

 wide and deep as the 4 interradial; thus the 8 arms are brought quite close together in 4 

 separate pairs. Each arm bears 100 to 120 tentacles. The stomach gives rise to 4 wide, 

 perradial pouches, which are lined on their edges by the 8 gonads. 



Color variable, being either gray, green, yellow-brown, red-brown, or very dark brown. 



Found on the northern coasts of Europe, on the Greenland coast, and on the coast of 

 America, nonh of Cape Cod. It has never been taken south of Massachusetts Bay. Very 

 rare on .•\nicrican coast. 



Complete descriptions and good figures of this medusa have been given by Sars, 1846; 

 Carus, 1857; and Taschenberg, 1877. 



Lucernaria "pyramidalis" Haeckel = L. quadricornis (?) 

 Luctrnaria fyramijalls, Haeckcl, iSSo, Syst. dcr Mcdusen, p. 391, taf. 22, 10 fign. 



Bell 4-sided and pyramidal, about 40 to 50 mm. wide and (with the style) 90 to 100 mm. 

 high. The 8 arms grouped in 4 pairs, the 4 perradial notches of the bell-margin being twice 

 as wide and deep as the 4 interradial. Each arm bears a large cluster of 130 to 140 tentacles. 



Fir.. T,-^(}.— Lurrrnarlit "pyramidalis," after HarckrI, in Das System dcr Mcdusen. 



Peduncle about 0.25 to 0.33 longer than bell-height. 4 short, blunt taeniola at its free distal 

 enil and a sharplv marked pyloric stricture at its proximal end at base of bell. 4 linear, inter- 

 radial strands of muscle-fibers traverse the length of the peduncle. Mouth cruciform, with 

 4 short, folded lips. The gonads are 8 blindly ending, transversely folded bands, grouped 

 mto 4 mterradial pairs. Thcv begin on the floor of the subumbrelja at a short distance above 

 the pyloric stricture and extend only to the crotch of the bell-arms. Thev diverge centrif- 



