628 



MEDUS.E OK TIIK WOULD. 



mere ridge or ledge-like mass of tissue covering tlic c()iicavit\' in wliicli lies the sense-cluli. 

 The dorsal scnsorv-pit in Aurellia soln/a is a deep triangular tunnel with a long, narrow mouth, 

 and is quite unlike the shallow' exumhrella sensorv-pit ot Aiirtllia aunta. 



The bell is 80 mm. wide and 40 mm. high. Canal-system similar to that ot" .liuAiin 

 aiirita, but the 4 circular, subgenital ostia are each only 2 mm. in diameter, whereas in A . aurita 

 thev are usually much larger. The oral arms are not <]uite as long as the radius of the 

 umbrella. The genital radius is about 0.4 that of the umbrella. 



Maldive Islands, Indian Ocean, and 15° west of Madeira in the North Atlantic. 



Aurellia labiata Chamisso and Eysenhardt. 



Aurelia labiatay Chamisso und Eysenhardt, 1820, Nova .Acta phys. mcd. Leop. Car., tome 10, p. 358, planche z8, figs. 1 Ay B . 

 Aurellia liibiatii, DE Blainville, 1834, Manuel d'.Actinolopic, p. 294, planclic 42, figs, i, 2. — Fewkes, 1889, American 



Naturalist., vol. 23, p. 592, fig. 2; Bull. Essex. Institute, Salem, vol. 21, No. 7, p. 122, plate 5, fig. 1. 

 DipIocraspfJon limbata, Brandt, 1838, Mem. Acad. Sci. St. Pctersbourg, Sci. Nat., ser. 6, tome 4, p. 372, taf. 10. 

 Aurelia clausa ()'oung medusa), Lesson, 1829, Voyage de la Coquillc, Zool., p. 119. 

 Aurelia labiata+ A. clausa+A. limbata, Haeckel, 1880, Syst. der Medusen, pp. 557, 558. 

 Aurelia limbata, GiiTTE, 1886, Sitzungsbcr. Akad. Wissen. Berlin, Jahrg. 1886, p. 836. — Vanhokfen, 1906, Nordisches Plankton, 



Nr. II, p. 61, fig. 32. — KiSHlNOUYE, 1910, Journal College of Sci. Tokyo, vol. 27, art. 9, p. 22. 



Fig. 398. — Aurellia labiata. Drawn by the author, from specimens collected by the U. S. Bureau of 

 Fisheries steamer Albatross at Masbate Anciiorage, Philippine Islands, .April 21, 1908. 



A, oral view of medusa with one mouth-arm cut ofT. B, bell-margin seen from exumhrella side showing 

 dorsalward migration of lappets and tentacles. C, section of bell-margin, the areas cut across 

 being dotted, r, circular vessel; r.v, exumhrella; /, marginal lappet; re, radial-canal; jm, sub- 

 umbrella; V, velum-like bell-margin of bell; /, tentacle. 



This species is distinguished by having 16 velar lobes separated b\' deep median clefts 

 instead of 8 simple lobes as in A. aurita. The canal-system is similar to that oi' Aurrllia aurita, 

 but there is probably a greater tendency for tusions to occur between the adiadial and other 

 canals than in //. aurita. The bell-margin projects downward from the subumbrella side as 



