532 



MEDUS.E OF THE AA'ORLD. 



The reicnt-ration of Htiliclystus has been studied by A. Meyer, 1865 (40 ste Versamml. 

 deiitsch. Naturforscher Aerzte, Hannover, p. 217), who gives a brief account of his experiments. 

 It appears that the medusa possesses considerable regenerative capacity. The style is regen- 

 erated if it be removed, and if only the lower end of tlie style be cut off the medusa usually 

 regenerates a new aboral end; but occasionally a bell is regenerated, thus giving an animal 

 with 2 liells. Somewhat similar results were attained by Kassianow, 1901, on Cratcrhjplnis. 



Characteristics of the So-called Species of Haliclystus. 



Haliclystus auricula Clark. 



Lucernaria auricula^ Rathkf, 1806, Miiller's Zool. Dan., Bd. 4, p. 35 {exdui. iynon). 



Halicl\!tus auricula, Clark, H. J., 1863, Jour. Boston Soc. Nat. Hist., vol. 7,p. 559.— At;Assiz,A., i865,North Amer.Acal., p.63, 

 figs. 88-90. — Clark, S. F., 1876, Exploration of Alaska, vol. i, p. 235.^Clark, H. J., 1878, Smithsonian Contributions 

 to Knowledge, pp. 1-130, plates 1-9, 145 figs. — Hacckel, 1879, Syst.der Mcduscn, p. 389. — Schlater, 1891, Zelt. wiss. 

 Zool., Bd. ^2, p. 580; Revue Sci. Nat. St. Petersbourg, Anne. 2, p. 176 (sense-organs, structure of). — Beai'Mont, 1893, 

 Trans. Liverpool Biol. Soc., vol. 7, p. 259; 1900, Proc. Roy. Irish Acad. Dublin, ser. 3, vol. 5, p. 806. — Bigelow, H. 

 B., 1909, Proc. U. S. National Museum, Washington, vol. 37, p. 316. 



(?) Haliclysius leituh, Kishinoiye, 1910, Journal College Sci., Tokyo, vol. 27, art. 9, p. 4, plate i, fig. 3. 



Disk aliuut 20 10 30 mm. wide and (with the style) 20 to 30 mm. high. Bell-margin 

 8-sided. The 4 interradial notches between the arms being only half to two-thuds as wide 

 as the 4 perradial clefts. Each arm terminates in a large cluster of 100 to 120 tentacles. These 

 tentacles are each about quarter as long as bell-diameter. They are hollow and terminate in 

 a globular tip thickly covered with nematocysts. There are 8 large, perradial and interradial, 

 marginal anchors (colletocystophores), which are coffee-bean-shaped and moiintetl, each one, 

 upon a short cylindrical base. These organs are much larger than in the European //. oclo- 

 radlatus. The aboral peduncle, or stalk, is about as long as bell-height. It is cruciform in 

 cross-section, there being 4 deep, interradial, longitudinal furrows beneath which are 4 well- 



