Identifier: medusaeofworld02mayo (find matches)
Title: Medusae of the world
Year: 1910 (1910s)
Authors: Mayor, Alfred Goldsborough, 1868-1922 Mayer, Alfred Goldsborough, 1868-1922
Subjects: Jellyfishes Cnidaria
Publisher: Washington, D.C., Carnegie institution of Washington
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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aas and is closely related to the Arctic medusa Homceonema platygonon Maas. Maas does not redescribe the medusa and his grounds for this opinion are not wholly clear. I have, therefore, retained H. alba provisionally in the genus Halicreas. Isonema racovitzar, described from a single preserved specimen by Maas, appears to have all of the characters of Halicreas. As the generic name Halicreas takes precedence, I do not think we can follow Bigelow, 1909, in calling this genus Homceonema. Halicreas papillosum Vanhoffen. (?) Halicreas minimum, Fewkes, 1882, Bull. Mus. Comp. Zool. at Harvard College, vol. 9, No. 8, p. 306. Halicreas papillosum, Vanhoffen, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer Valdivia, Bd. 3, Lfg. I, p. 68,taf. 9, fign. 7, 8; taf. II, fig. 30.—Maas, 1905, Craspedoten Medusen der Siboga Expedition, Monog. 10, p. 57, taf. 10,fig. 70; taf. 11, fig. 71.—Bigelow, H. B., 1909, Mem. Museum Comp. Zool. at Harvard College, vol. 37, P- !38> pates3. 33. 34-
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2+3- Fig. 142.—Halicreas papillosum. Fig. 244.—Halicreas (Haliscera) rotundalum. Fig. 243.—Halicreas papillosum. Fig. 245.—Halicreas glabrum. Above figures after Vanhoffen, in Tiefsee Expedition Valdivia. 392 MEDUSA OP THE WORLD. Bell 44 mm. wide, flat and thick-walled. A solid apical projection is usually, but not inva-riably present. 8 radially situated clusters of wart-like projections on sides of exumbrella ina zone above bell-margin. These wart-like, or prickle-shaped, projections are bluntly pointedand give the bell an octangular appearance when viewed from the apex or the oral side. Theyare quite variable in development and increase in size with age. Velum very wide. 130 to 640tentacles of various sizes, the longest and widest being at the bases of the 8 radial-canals,while the interradial, adradial, etc., are of decreasing size and are apparently younger; thetentacles taper gradually and the longest are about as long as the bell-diameter; while thesmallest tentacles in

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