472 



MEDUSA OF THE WORLD. 



While the above description was in press Bigelow, 1909, published an excellent figure of 

 one of 4 specimens of M. grimaldi which he describes from the eastern tropical Pacific. He 

 agrees with my view that JE. grimaldi is probably identical with M. weberi. His figures of the 

 female show dense reddish-brown Atolla colored entoderm in the stomach and its pouches, 

 and irregularly distributed, white eggs. The male gonads are, however, uniformly distributed 

 over the ectoderm over-lying the gastric pouches. Bigelow shows 3 of the short, solid, tapering, 

 marginal tentacles per interradial quadrant, such as Maas observed in his specimens. 



Vanhoffen, 1908, has I believe described this medusa under three names as follows: 



Vanhoffen's medusae are of a deeper brown color, and most of them have more secondary 

 tentacles and sensory-clubs than in the medusae described by Maas and Bigelow; but the 

 secondary tentacles of Solmundella are very variable in number, and one would expect the 

 same to be the case in ALginura. Vanhoffen sectioned his specimens and demonstrated that 

 there was neither marginal nor peronial canal-system. 



jEginura incisa. 

 Plate 55, fig. 3. 

 Cunoctantha incisa, Mayer, 1900, Bull. Mus. Comp. Zool. at Harvard College, vol. 37, p. 66, plates 44, figs. 145, 146. 



Immature medusa. — Bell 5 mm. wide, flatter than a hemisphere, with a low, wide, solid, 

 apical projection. 8 tentacles, each 1.5 times as long as the bell-radius. 24 sensory-clubs, 3 

 in each intertentacular octant, each with a single crystalline concretion, and with 24 otoporpae 

 above the clubs, 8 open peronial furrows. Velum wide. Mouth a simple, round opening. 

 Central stomach gives rise to 8 main radial pouches in the radii of the 8 tentacles and the outer 

 ends of these pouches are cleft by the conical roots of the tentacles so that there are 16 short 

 outermost stomach-pouches. Peripheral canal-system ( ?) Gonads not developed. 



Entoderm of the tentacles and stomach is delicate green, other parts colorless. Two 

 specimens found at Tortugas, Florida, on the surface, in May, 1899. 



This is apparently an immature Mginura, but I can not state that it is the young of any 



described form. 



Genus jEGINOPSIS Brandt, 1835. 



/Eginopsh, Brandt, 1835, Recucil Actes seances publiques Acad. Imp. Sci. St. Petersbourg (separate), p. 22; 1838, Mem. Acad. 

 Imp. St. Petersbourg, Sci. Math, et Nat., ser. 6, tome 4, par. 2, p. 363.— Haeckei., 1879, Syst. der Medusen, p. 342 — 

 Maas, 1906, Fauna Arctica, Jena, Bd. 4, LFg. 3, pp. 485, 497.— Vanhoffen, 1907, Zool. Anzeiger, Bd. 32, p. 176. 



The type species is Mginopsis laurentii Brandt, from the Arctic Ocean. 



GENERIC CHARACTERS. 



iEginidae with 8 peronial strands, 4 tentacles, and 16 (8 cleft) peripheral stomach-pouches. 



jEginopsis laurentii Brandt. 



Mt-inopsis laurentii, Brandt, 1838, Mem. Acad. St. Petersbourg, ser. 6, tome 4, Sci. Nat., p. 363, taf. 6, fig. 1-6— Agassiz, 

 A., 1865, North Amer. Acaleph<e, p. 54. — Birula, 1896, Annuaire Muscc Zool. Acad. Imp. Sci. St. Petersbourg, tome 

 1, p. 347. — Vanhoffen, 1898, von Drygalski, Greenland Expedition, Bd. 2, p. 273.— Linko, 1905, Zool. Anzeiger, Bd. 

 28, p. 219.— Maas, 1906, Fauna Arctica, Bd. 4, Lfg. 3, pp. 485, 510, Jena (review of literature). 



Mginopsis laurentii + M. mertensii, Haeckel, 1S79, Svst - dL ' r Medusen, pp. 242, 243. 



Solmundus, sp., Fewkes, 1888, Lady Franklin Bay Expedition, Appendix xi, vol. 2. 



(')Solmundus facialis, GrSnberc, 1898, Zool. Jahrb., Abth. Syst., Bd. II, p. 466, taf. 27, fign. 7, 8. 



Solmaris tetranema, Hargitt, 1902, Biol. Bulletin Woods Hole, vol. 4, p. 17, fig. 5; 1904, Bull. U. S. Bureau of Fisheries, vol. 

 24, p. 58, fig. 



(>)Solmundus glacialis, Broch, 1907, Report 2d Arctic Exped. in the Fram, Hydroiden und Medusen, p. 8. 



