470 MEDUSAE OF THE WORLD. 



sense-clubs themselves. Each club contains 3 to 4 crystalline concretions of entodermal origin, 

 and the club itself is pyriform and mounted with its broad end upon a marginal sense-cushion 

 which bears long bristles. Velum well developed and provided with circular muscles. The 

 mouth is provided with 4 prominent lips and is cruciform and situated at the extremity of a 

 4-sided throat-tube so that the mouth is at about the level of the velar opening. 



The central stomach is flat and octagonal and about half as wide as the medusa itself. 

 It gives rise to 8 primary outpocketings in the radii of the 8 tentacles, 4 of these being in the 

 radii of the cruciform lips and 4 alternating with them. These 8 principal pouches are deeply 

 cleft in their middle by the 8 tentacles, so that there are 16 outermost stomach-pouches. These 

 are rectangular with rounded angles and the clefts between adjacent lappets are very narrow, 

 the pouches extending over the greater part of the area of the lappets. The 8 marginal loop- 

 canals are well developed, each one arising from the central stomach on one side of a tentacle 

 and extending around the margin of the lappet to reenter the stomach upon the adjacent side 

 of the tentacle 45 away from its point of origin. The gonads are developed in the ectoderm of 

 the subumbrella under the 8 principal stomach-pouches and their 16 terminal outpocketings. 

 The eggs are very numerous and are uniformly distributed, not few in number and irregularly 

 developed as in Mginura grimaldii. 



The central stomach, mouth-tube, and lips are intense chrome-yellow. The entoderm of 

 the peripheral pouches of the stomach and the tentacles is rose-red, and the margin of the 

 lappets is orange-red. 



This species was drawn from life by Haeckel in the Canary Islands, and later he had a 

 larger preserved specimen from the Atlantic (?) coast of South Africa. Haeckel calls this 

 larger specimen Cunoctona nausithoe, but it appears to be only a later stage of his Canary 

 Island medusa. He gives attractive figures of JEginura lanzerota. 



JEghmm grimaldii Maas. 



JEginura grimaldii, Maas, 1904, Result. Camp. Sci. Prince de Monaco, fasc. 28, p. 38, planche 3, figs. 19-28. — Bicelow, H. 



B., 1909, Mem. Mus. Comp. Zool. at Harvard College, vol. 37, p. 80, plate 9, fig. 4. 

 JEginura weberi, Maas, 1905, Craspedoten Medusen der Siboga Expedition, Monog. 10, p. 77, taf. II, fig. 73; taf. 12, fig. 76; 



taf. 14, fign. 90-99. 

 Cunoctona grimaldi var. munda + C. guinensis + C. obicura Vanhoffzn, 1909, Narcomedusen der Valdivia Expedition, p. 53, 



taf. 2 und 3. 



Bigelow found four specimens of this medusa in the eastern tropical Pacific which 

 ranged from 13 to 21 mm. in diameter, and Vanhoffen describes an apparently identical 

 medusa as Cunoctona obscura from the coast of German East Africa which was 34 mm. 

 wide. 



The bell in specimens described by Maas from the Malay Archipelago is 3.5 to 5 mm. 

 wide, and in an imperfect specimen from the North Atlantic 12 mm. wide. It is hemispherical 

 with a slightly flaring margin. The gelatinous substance is thick at the apex, but thin at the 

 margin. In the Malayan specimens the lower velar margin is entireand simplewithout notches, 

 but in the North Atlantic specimen there were 8 slight notches in the positions of the 8 radial, 

 peronial strands. The 8 peronial furrows are very shallow at the margin, especially in the 

 Malayan specimen, but they become deeper the nearer they approach to the tentacles, and 

 at the insertion of the tentacle each furrow forks and sends up a pair of blindly-ending, taper- 

 ing branches which extend into the gelatinous substance on both sides of the base of each 

 tentacle. 



The 8 principal tentacles are stiff", tapering, and all of the same size and length. Their 

 entoderm consists of a single row of chordate cells, set coin-like one after another in an axial 

 row throughout the shaft of the tentacle, but at the base and root of the tentacle these cells are 

 more confusedly grouped. These tentacles project out from the sides of the exumbrella, all 

 at the same level, in a zone about one-third the distance from apex to margin above the lower 

 margin. They bend in sickle-like curves downward toward the bell-margin and are about as 

 long as the bell-diameter, or slightly longer. Besides the 8 long, principal tentacles there are 

 24 very small, tapering, secondary tentacles which arise from the margin; 3 in each inter- 

 tentacular octant. The entoderm of these minute tentacles consists of chordate cells, similar 

 in arrangement to the cells of the 8 principal tentacles. These secondary tentacles are only 

 about one-twentieth as long as the bell-radius in the Malayan specimens, and even smaller in 

 the North Atlantic specimens. 



