

50 BULLETIN OF THE BUREAU OF FISHERIES. 



Oceania languida A. Agassiz. PI. A", fig. 2. 



Oceania languida A. Agassiz, in I. Agassiz, Contributions to Natural History of United States, Vol. IV, 1862, p. 353; North 



American Acalephse, L865, p. 70. 

 Phialidium languidum Haeekel, System der Medusen, 1S79, p. 188. 



Bell rather low, symmetrically arched, walls very thin and delicate, collapsing when taken from 

 the water. Velum also very narrow and delicate. Marginal tentacles numerous in adult, usually 32 

 or more, with about 2 otocysts between the bases of each two. Gonads elongate masses along the 

 distal half of the radial canals, or when fully mature extending almost to the manubrium, the latter 

 very short and with four-lobed mouth. Tentacular bulbs large ami oval in form. The medusae are 

 sluggish in temperament, moving languidly, often simply drifting; when disturbed, or even without 

 apparent disturbance, they often contract the margins of the bell, folding the body into an aspect of 

 collapse. This species is very abundant in the Woods Hole region, particularly in middle or late sum- 

 mer. In size it varies from 15 to 20 mm. in broad diameter, with about half the height. 



The ontogeny of this medusa is somewhat doubtful. Haeekel assigns it to CampamiMna languida. 



1 have never been able to determine definitely its entire life history. 



Colors. — Bell very transparent; tentacle bulbs brownish with green center; gonads likewise greenish 

 brown; manubrium streaked with greenish. 



Distribution. — Bather general throughout the region, June to September. 



Oceania singularis Mayer. 



Oa ania singularis Mayer, Bulletin Museum Comparative Zoology, Vol. XXXVII, 1900, p. 7. 



Medusa with straight, sloping sides, and with a rather sharply constricted apical region, somewhat 

 lens-shaped. Marginal tentacles 16, with large hollow basal bulbs, the tentacles rather short and 

 abundantly supplied with mematocysts. There are also 16 rudimentary tentacles and 32 otocysts, 



2 between the bases of each two rudimentary tentacles, each otocyst with a single otolith. Manu- 

 brium rather long, quadrate in form, and with four-lobed mouth. Ontogeny unknown. 



Colors. — Bases of tentacles greenish, distal portions brownish, gonads of turquoise tinge. 

 Distribution. — Newport, R. I. (Mayer). 



EPENTHESIS McCrady ( L857). 

 Epenthesis folleata McCrady. PI. V, tig. 3. 



EpenthesisfoUeata McCrady, Proceedings Elliott Society of Natural History, Vol. I. 1857, p. 191. 



tic, aniafolleata L. Agassiz, Contributions t<- Natural History United States, Vol. IV, 1862, p. 353. A. Agassiz. North Ameri- 

 can Aoalephav, 1865, p. 70. 

 EoenthesisfoUeata Haeekel, System der Medusen, 1S79. p. 184. 



Low, sub-hemispherical bell about two-thirds as high as broad, with firmer walls than in preced- 

 ing species. Marginal tentacles Hi in mature specimens, with 16 otocysts alternating therewith, tenta- 

 cles with rather large basal bulbs. Velum rather narrow but fairly firm in texture. Gonads form 

 elliptical masses on the distal half of the radial canals. Manubrium moderately developed, quadrate 

 in shape, mouth with four everted lips. Ontogeny unknown. 



Colors. — Basal bulbs of tentacles greenish by reflected light, or brownish by transmitted light. 

 Gonads similarly colored, though paler. Manubrium more or less streaked with light green. 



Distribution. — Common in Vineyard Sound, Woods Hole, etc., from July to September. 



PHIALIS Haeekel (1877). 



Phialis cruciata (A. Agassiz). 



Halopsis cruciata \. Agassiz, North American Acalephs, 1865, p. 10'-'. 



Phialis cruciata Haeekel, System der Medusen, 1879, p. 181; Prodromus Systems Medusarum, 1S77. 



Bell low hemispherical, somewhat broader than high, about 30 to 40 mm. broad in adults. Mar- 

 ginal tentacles rather numerous, and with interposed cirri. Otocysts 12, three between each two 

 radial canals. Manubrium rather short, with quadrate base, and with four-lobed mouth and everted 

 lips. Gonads linear along the course of the radial canals. Ontogeny unknown. 



' 'olors. — Bell light pinkish, as are also the gonads. 



Distribution. — Nahant, Massachusetts Bay. This medusa has not been taken within the region in 

 question, though likely to occur there. 



