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Genus LYMNOREA Pron et Lesueur. 



( ?) Fnfonia, PERON FT LCSIIKUR, 1809, Hist. Gen. des Meduses, p. 16. 



Lymnorea, PERON KT LESUEI'R, 1809, Ann. Mus. Hist. Nat. Paris, tome 14, p. 329. DE BHINVIM i, 1834, Manuel il'Actim.l., 



p. 290. MAYER, 1900, Bull. Mus. Cmnp. Zool. at Har\ard College, vol. ',7, p. 6; 1904, Mem. .N.n. Su. Brooklyn Inst. 



Museum, vol. i, p. io. Ar.ASStz and MAVER, 1902, Mrm. Mus. Gimp. Zool. at Harvard College, v..l. i(,. p. 144. 

 Limnorra+ Thaninmtonui, HAKTKM-, 1879, Syst. der Medusen, pp. 85, 86. 

 l.tmnurfu^- Thomiiiutoma, VANHOFFEK, 1891, Zool. An/eiger, Bd. 14, p. 445. 

 MiHtadia, BROOKS and RlTTENHOUSE, 1907, Proc. Boston Soc. Nat. Hist., vol. 33, p. 437. 



The oldest species of this genus is l.\tnnur,-a tri,;im, described by Peron and Lesueur, 

 and first figured by de Blainville, 1834. It occurs on the southern coast of Australia. The 

 figures and description leave much to be desired, but the branching oral tentacles are clearh 

 represented. Tht- marginal tentacles are small and numerous. 



GENERIC CHARACTERS. 



Margelinx with branched oral tentacles and with 8 or more marginal tentacles which 

 arise separately, not in clusters, from the bell-margin. The hydroid is unknown. 



Haeckel, 1879, would call medusae with 8 marginal tentacles Thamnostoma, and those 

 with 16 or more Lnnnori-u. He introduced the spelling Limnorca, but Peron and Lesueur 

 spell it Lymnorea. Owing to the very incomplete description of Peron and Lesueur it is 

 impossible to determine whether Favonia is or is not equivalent to Lymnorea. Judging from 

 de Blamville's, 1834, copy ot Peron and Lesueur's unpublished figure, it appears to be closely 

 allied to Lymnorea, but its relationships must remain uncertain, l-'tivnnia takes precedence 

 over Lymnorea, should it be equivalent, for it precedes Lymnorea in Peron and Lesueur's 

 description. 



Lymnorea dibalia. 



Liszia dibalia, BUSCH, iSijl, Beohach. wirbellos. Seeth., p. 23, taf. 1, fign. 7-9. 



Ttiumnostomti dibaJis, HAEOKEL, 1879, Svst. der Medusen, p. 86. GRAEFKE, 1884, Arbeit. Zool. Inst. Wien., Bd. 5, p. 348. 



Hell oval, 7 mm. high, 6 mm. wide. 8 marginal tentacles, those at the bases of the 4 

 radial-canals being longer than the 4 interradial tentacles. The ocelli are borne upon pro- 

 jections, one ot which arises from each tentacle-bulb. The stomach is cubical and lacks a 

 peduncle, and the throat-tube is as long as the stomach. There are 4 oral tentacles which 

 branch dichotomously twice. 4 swollen gonads on the interradial sides of the stomach. 



Found at Trieste, Adriatic Sea, Mediterranean. Graefte states that the mature medusje 

 are found in October, and the young first appear in September. 



Lymnorea macrostoma. 



Thamnostoma rnacro<.tomti, HAK'KH , iSy9, Svst. der Medusen, p. 86. 



Hell cubical, 8 mm. high, 8 mm. wide. 8 similar marginal tentacles, each longer than the 

 bell-diameter. A simple, abaxial ocellus at tin- base ot each tentacle. Stomach globular with- 

 out a peduncle. The throat-tube is 3 times as long as the stomach and extends beyond tin- 

 velar opening. There are 4 short, oral tentacles, each of which branches dichotomously o to 8 

 times, thus giving rise to 80 to IOO terminal branches in each (jiiadrant. 4 gonads on sides of 

 Stomach. Color ( ?) Indian Ocean, Singapore. 



Lymnorea ocellata Agassiz and Mayer. 



Lymaorea afdlntti, At,\ssi/., A., and MAYER, 1902, Mem. Museum Comp.Zool.al Harvard CoU*i vol. 16, p. 1441 plate 2, figs. 9-11, 



( ') I.ymnorfa Iritdra, Pi KON tr I.tsi n R, 1X09, Anna), du Mus. Hist. Nat. P. ins, tome 14, p. 521); dc- Bl.niu ille, lH)4, Man. 



Actinolnt-H-, p. 2(jo, plate 40, fig. 2; HAH KM, lS79, Svst. der MrditM-n, p. 87. 

 ( ) l.imrtorea probosciitfa, HAFCKM, iS?<j, Svst. der Medusen, |<. Sy. 

 ( f)Limnorea probosfiilta, BRDOT, 1901, Revue Suisse de Zoo!., tome 9, p. 4X4; Ibitl., 1905, tttine i',, p. 137. 



The top ot the bell is flat and the sides flare outward in a bell-shaped manner. The bell 

 is about 4 mm. in diameter and is about as high as it is broad. The walls are thin and quite 

 flexible. There are about 50 short, stiff" tentacles which are each about half the length of the 

 bell-height. These tentacles are usually carried curled upward and their entodermal cores are 

 solid and composed of vacuolatcd chordate cells. The basal bulbs of the tentacles are large 



