LEPTOMEDUS^E EUTIMA. 



303 



Claus, 1881, who has made a most elaborate study of 0. " gegenbauri" states that it is 

 identical with Haeckel's 0. " germanica," and it seems probable that Haeckel has constructed 

 the above genera and species out of growth-stages in the development ot one and the same 

 medusa; also that the medusa may become mature with 8 or only after it has acquired 16 or 

 more tentacles, such phenomena being not uncommonly observed among Hydromedusae. 

 The following is a description of the latest stage = " Octorchandra canariensis " Haeckel : Bell 

 hemispherical, 25 to 30 mm. wide. There are 16 to 32 tentacles somewhat longer than the 

 bell-diameter. 120 to 150 tubercles upon the bell-margin with 200 to 300 helically coiled 

 cirri between them. 8 adradial lithocysts, each with a crescentic row of 16 to 20 concretions. 

 Velum well developed. Peduncle tapering, narrow, and nearly prismatic below, but flaring 

 outward above where it arises from the suburnbrella. Peduncle about as long as the bell- 

 166. 167. 



Fig. 166. Eulima campanulata. After Haeckel, 1879. 



Fig. 167. Young medusa. From life, by the author. 

 Zoological Station, Naples, February 5, 1908. Side 

 view and details of a quadrant of bell-margin. 



diameter. Stomach urn-shaped, 4-sided, short, with 4 recurved lips having folded margins. 

 The linear gonads are found upon the suburnbrella regions of the 4 narrow radial-canals 

 and also upon the peduncle about half-way between the stomach and the base of the peduncle. 

 Thus there are 2 gonads on each of the 4 radial-canals. The 4 gonads on the suburnbrella 

 are fully twice as long as those on the peduncle. Stomach, canal-system, gonads, and tentacles 

 more or less greenish, sometimes verdigris-green or emerald-green. 



This form is described by Haeckel from the Canary Islands. Medusae similar to the 

 above, but with 8 to 16 tentacles, are found quite commonly in surface-tows in the Mediter- 

 ranean and off the Atlantic coasts of France, Great Britain, and Germany. According to 

 Graeffe, 1884, the medusae are set free from the hydroids at Trieste, Adriatic, in April and 

 May, and become mature in May and June, and still another brood of young medusae 



