134 



MEDUS.E OF THE WOULD. 



Cytaeis pusilla Gegenbaur. 



(.'v/.n'j fuiilla, Gr.iiiNBAi-R, 1856, Zeit. fur wissen. Zool., Bd. 8, p. 228, taf. 8, fig. 8. KEKERSTEIN UNO EIILERS, 1861, Zoolug. 



Beitrag., p. 84, taf. 13, fign. 8, 9. HAECKEL, 1879, Syst. der Medusen, p. 75. 

 (?) Cubogasler diuonema (young medusa), HAECKEL, Ibid., p. 76. 



This medusa is recorded from the Mediterranean. For details see tabular synopsis of 

 the medusae of Cyttcis. 



Haeckel describes "Cubogaster dissonema" a small medusa 2 mm. high, with 2 well- 

 developed and 2 immature or rudimentary marginal tentacles, and 8 oral tentacles. This 

 he found at Croisic, Bretagne, Atlantic coast of France. It may be the young of C. pusilla ( ?) 



7'- 



Flc. 71. Cvttfis atlantica, after Maas, in Result. Camp. Sci. Prince de Monaco. 



FIG. 72. Cytefis " macrogaster" ((7. atlantica), after Haeckel, 1879. 



FIG. 73. C.ytas'n pusilla, after Gegenbaur, in Zeit. fur wissen. Zool., Bd. 8. 



Cytseis vulgaris Agassiz and Mayer. 



Cyttsis vulgaris, AGASSIZ and MAYER, 1899, Bull. Mus. Comp. Zool. at Harvard Coll., vol. 32, p. 161, plate 2, figs. 3-5. MAAS, 

 1905, Craspedoten Medusen der Siboga Exped., Monog. 10, p. 8, taf. i, fign. 4-7; 1906, Revue Suisse de Zool., tome 4, 

 p. 85, fig. 3, plate 2. 



Mature specimens of this medusa are described by Maas from the Malay Archipelago. 

 Agassiz and Mayer described only half-grown medusae from the Fiji Islands. 



Mature medusa. Bell 5 mm. high, prismatic, 4-sided, and with a flat top. There are 

 4 thick, radially placed, marginal tentacles, each somewhat shorter than the bell-height. These 

 tentacles end in blunt tips and have large hollow basal bulbs. Maas describes a thick lens- 

 shaped swelling on the abaxial side of each tentacle-bulb, but his specimens are somewhat 

 contracted through preservation in formalin. The basal bulbs of the living medusas studied 

 by Agassiz and Mayer were large and swollen, but lacked the lenticular, ectodermal swellings. 

 On the other hand Agassiz and Mayer found only half-grown medusae, and it is possible that 

 the peculiar form of the basal bulbs described by Maas may be characteristic of the full-grown, 



