LEPTOMEDUS.E jEQUOREA. 



327 



the oldest stage in Haeckel's "System," Mquorea and Polycanna being intermediate stages. 

 I have tabulated Haeckel's description of these forms and present it herewith. It these 

 forms be actually one and the same species, it appears that the stomach ranges in width 

 from two-thirds to four-thirds as wide as the bell-radius, and from a mere short cylinder with 

 vertical walls and mouth widely gaping, to a conical form with elongate cylindrical throat- 



tube and tightly closed mouth. The tentacles may be as short as the bell-radius or very long, 

 possibly dependent upon their state of contraction, and may range from 50 to 300 in number. 



sts range from being less numerous than the tentacles to 10 times as numerous 



r. 



Varieties of Mquorea forskaleti, from Haeckel's Descriptions. 



Size of bell in mm. 



Shape and size of stom- 

 ach. Size in terms of 

 bell-radius (r). 



Number of tentacles. 



Number of lithocysts 

 and concretions. 



Number of radial-canals 

 Number of gonads. 



Color. 

 Where found. 



Mquorea discus 

 Haeckel, 1879. 



.Mquorea violacea 

 Milne-Edwards, 1841 



100 to 125 wide, 20 to 25 

 high. 



Shallow, with open 

 mouth, two-thirds r 



wide. 



50 to 80 very long. 



500 to 800, each with 2 

 to 4 concretions. 



100 to 160 



Bilamellar, on each and 

 every radial-canal. 



Messina, Mediterranean 



70 wide, 10 high. 



Shallow, with open 

 mouth, two-thirds r 

 wide. 



60 to 80 short. 



200 to 300, each with 2, 

 occasionally 3, con- 

 cretions. 



60 to 80 



Bilamellar, as in M. 

 "discus." 



Gonads, tentacles, and 

 bell-margin violet. 



Mediterranean. 



/Equorea forskalea, 

 according to Haeckel, 



1879. 



200 to 400 wide, 40 to 

 50 high. 



As in M. violacea. 



Polycanna fungia 

 Haeckel, 1879. 



100 to 200 



ico to 200 



Bilamellar, as in JE. 

 discus and JE. vio- 

 lacea. 



Gonads brown. Gas- 

 tric canals gray. 



Mediterranean. 



150 wide, 50 high. 



Four-thirds r wide; 

 conical, with long 

 cylindrical throat- 

 tube and 32 large 

 lancet-shaped lips. 



80 to 100 very long. 



400 to 600, each with 4 

 concretions. 



160 to 200 



Linear, folded, 80 to 100 

 on alternate canals. 



Colorless. 



Southwestern coast of 

 Norway. 



Polycanna germanica 

 Haeckel, 1879. 



Size of bell in mm. 



Shape and size of stom- 

 ach. Size in terms of 

 bell-radius (r). 



Number of tentacles. 



Number of lithocysts and 

 concretions. 



Number of radial-canals. 



Number of gonads. 



Color. 



Where found. 



Polycanna italica 

 Haeckel, 1879. 



60 to 80 wide, 30 to 40 

 high. 



As in P. fungia, but 

 natter and with 50 to 

 70 lips. 



50 to 70 very long. 



200 to 400, each with 4 

 concretions. 



50 to 70 



Linear, 50 to 70. 



Colorless. 



German Ocean, Helgo- 

 land. 



80 to 90 wide, 20 to 22 

 high. 



Two-thirds r wide; flat, 

 with a long cylindrical 

 mouth-tube and 50 to 

 60 small crinkled lips. 



50 to 60 long. 



100 to 200, each with 2 

 concretions. 



50 to 60 



Linear, bilamellar, 50 

 to 60. 



Lips and gonads rose- 

 red. Bell with red- 

 dish hue. 



Mediterranean. 



Polycanna vitrina = 

 Mquorea vitrina 

 Gosse, 1853. 



40 to 60 wide, 20 to 30 

 high. 



1 r wide; funnel-shaped 

 20 to 50 lips. 



200 to 300 short. 



80 to 100, each with 2 to 

 3 concretions. 



80 to 100 



Linear, irregularly 

 knotted, 80 to 100. 



Stomach, gonads, and 

 mouth milky-white. 



British coasts. 



Mesonema eurystoma 

 Haeckel, 1879. 



60 to 80 wide, 15 to 20 

 high. 



Two-thirds r wide; 

 shallow, with widely 

 gaping mouth. 



60 to 80 short. 



300 to 500, each with 2 

 to 4 concretions. 



60 to 80 



Linear, bilamellar, 60 to 

 80. 



Colorless. 



Adriatic, Mediterra- 

 nean. 



