LEPTOMEDUS.E — EIRENE. 



813 



South Carolina, and at Tortugas, Florida. It was found by Brooks, 1886, at Beaufort, North 

 Carolina. It occurs in summer and is a rare medusa. 



This medusa has usually been placed in the genus Eutima, but I find that when adult it 

 has more than 8 lithocysts, and should, therefore, be included in the closely related genus 



Eirene. 



Eirene quadrigatum. 



lrenium quadrigatum, Haeckel, 1879, Syst. der Medusen, p. 199, taf. 12, fign. 12, 13. 



Bell somewhat flatter than a hemisphere, 1 5 mm. wide. Gelatinous substance very thick, 

 bell-cavity very shallow. There are 4 very long tapering tentacles, with hollow, conical, basal 

 bulbs. 120 to 160 helically coiled marginal cirri, and 30 to 40 conical excretion papillae upon 

 the bell-margin. Also 60 to 80 lithocysts each with 4 to 6 concretions. The stomach is pyn- 

 form about half as long as the bell-radius, and provided with 4 short, complexly folded lips. 

 It is mounted upon a wide, bluntly conical, gelatinous peduncle, about twice as wide as long 

 and about two-thirds as wide as the bell-diameter at its base. The gonads are 4 small, com- 

 plexly folded bands upon the 4 radial-canals. They occupy nearly the entire lengths ot the 

 canals, leaving both ends free. Stomach, gonads, and tentacle-bulbs greenish. West coast of 

 Africa, Mogador, Morocco. Development unknown. 



Fig. n\— Eirene quadrisalum, after Haeckel, 1879. 



Fig. nl-Eiren, danduensis, after Bigelow, in Bull. Mus. Comp. Zool. at Harvard College. 



Eirene danduensis Bigelow. 

 Eirene ianiutnsh, B.gelow, H. B., .904, Bull. Museum Comp. Zool. at Harvard College, vol. 39, p. 254, plate ., fig. S ; 



plate 2, fig. 6. 

 Eirene danduensis (palhensis) 1909, Mem. Ibid., p. 164. 



Bell 25 mm. wide and 8 mm. high, with fairly thin walls. 32 tentacles, the 4 radial ones 

 being a fourth longer than the others. Each tentacle-bulb is flanked by a pair of small am. 

 About 70 small papills scattered irregularly along the margin. 32 lithocysts, 8 in each quad- 

 rant Each lithocyst contains about 5 spherical concretions. Peduncle long and conical, 

 extending well beyond velar opening. Stomach about half as long as peduncle, but may be 

 extended to nearly double this length. There are 4 simple lips. The 4 spindle-shaped gonads 

 occupy the distal two-thirds of the radial-canals. The bell is colorless, gonads bluish-green. 

 Found ofF Haddummati Atoll, Maldive Islands, Indian Ocean, in January. Th 1S species is 

 distinguished by the great length of the peduncle and stomach. It may prove to be identi- 

 cal with Phortis palkensis, but the latter appears to lack marginal cirri. 



Eirene medusifera Bigelow. 

 Eirene medusifera, B.gelow, H. B., .909, Mem. Mus. Comp. Zool. at Harvard College, vol. 37, p. .61, plate 37, figs. . to 8. 



Bell 8 mm. wide, nearly hemispherical, gelatinous substance not thick. About 21 

 tentacles with swollen, conical bases and thread-like extremities about as long as the bell- 

 radius There are also a few marginal knobs, but these are probably only young tentacles 



