64 BULLETIN OF THE BUREAU OF FISHERIES. 



HALICYATHUS Haeckel (1879). 



Halicyathus lagena Haeckel. 



Lucernaria auricula Fabricius, Fauna groenlandica. 17S0, p. 341. 



hucernariafabricii L. Agassiz, Contributions to Natural History of United States, Vol. IV. 1862, p. 176. 



Manania auricula Clark, Journal Boston Society Natural History, Vol. VII, 1863, p. 542; A. Agassiz, North American 



Acalephae, 1865, p. 62. 

 Manania lagena Haeckel, Prodromus Systemae Medusarum, 1877, No. 381. 

 Halicyathus lagena Haeckel, System der Medusen, 1879. p. 394. 



Umbrella deep, flask-shaped, about twice as high as broad; stalk slender, cylindrical, single- 

 chambered, much longer than height of bell. Arms 8, arranged in pairs, nut longer than broad, each 

 with 60 to 70 delicate tentacles. Eight marginal anchors. Diameter 5 to 7 mm.; height, including 

 stalk, 20 to 30 mm. 



Colors. — Black to dark brown, occasionally reddish. 



Distribution. — Eastport, Me. (Stiiupson); Swampscott, Mass. (Agassiz). 



These four descriptions are compiled chiefly from those of Agassiz, Haeckel, Stimpson, and Clark. 

 The species are only rarely found within the Woods Hole region. 



PEROMEDUSiE. 



Only a single genus of the Peromedusa^ is known to come within the limits of this region, and that 

 but rarely, specimens being drifted in currents of the Gulf Stream. 



Generic characters. — Umbrella with 4 perradial, buccal pouches and with 4 basal funnels; gastric 

 pouches with 2 rows of filaments. 



PERIPHYLLA Steenstrup (1837). 



Periphylla hyacinthina Steenstrup. 



Periphylla kyaeintkina Steenstrup, Acta Musei Hafniensis, 1S37. Haeckel. Systemae der Medusen, 1879, p. II 1 .'. Fewkes 

 Report U. S. Fish Commission 1884,p. 933. 



Umbrella bell-shaped; the 8 tentacle lobes with about the same marginal dimensions as the rho- 

 palial lobes. Length of tentacles about twice the bell-height. Manubrium extending to base of the 

 marginal lobes, and about twice as broad as long. 



I 'olors. — Exumbrella reddish, pedalia and marginal lobes red to violet, tentacles bluish ( Haeckel ). 



Distribution. — Greenland (Steenstrup); Gulf Stream south off Marthas Vineyard (Fewkes). 



Periphylla humilis Fewkes. 

 Periphylla humilis Fewkes, Report U. S. Fish Commission 1884, p. 931. 



Umbrella low, conical, diameter twice that of height. Rhopalia 4, provided with protecting 

 hoods. Marginal tentacles 12, yellowish in color. Exumbrella brown, rough and opaque; central 

 disk and corona usually uniform brownish. 



Distribution. — As of preceding species. 



Periphylla peronii Haeckel. 



Ckarybdea periphylla L. Agassiz, Contributions Natural History United States. Vol. IV, 1862, p. 173. Peron and Lesueur, 



Tableau des Meduses, 1809, p. 332. Verrill, Report U. S. Fish Commission 1871, p. 724. 

 Periphylla peronii Haeckel, System der Medusen, 1879, p. 420. 



Umbrella low-eonical, about as broad as high. Marginal lappets 16, S tentacular and 8 ocular. 

 Tentacles long and stout, about as broad at base as the marginal lappets. Manubrium about as broad 

 as long, and somewhat cubical in shape. 



Distribution. — Tropical Atlantic (L. Agassiz); Georges Bank (S. I. Smith). 



CUBOMEDUS^. 



Of the Cubomedusai only a single family has representatives in this region, so far as I am aware, 

 and of this but a single genus and species occurs. Other examples are likely to occur, however, under 

 favorable circumstances. 



