SEMAEOSTOMJ i. ni \< I u.oi'iKU; \. 



613 



(.1 Nl KIC CHAKAl I I US. 



Ulmaridae with i'> marginal sense-organs ami mum-ions marginal lappets. I he ten- 

 tacles arise in 16 simple, linear clusteis tnnn the Hum- ot the subumbrella, centripetal t<i the 

 margin. Central mouth surrounded In 4 mouth-arms hearing curtain-like lips. Gonads 

 are 4 complexly folded sacs which proji-ct oui\\ard in the 4 mtei radii from the floor ot the 

 subumbrella. No subgenital pits. The central stomach gi\es rise to numerous radiating 

 canals, some of which anastomose. There is a ring-canal at the bases ot the marginal lappets. 

 Tentacles hollow. 



of the Species nj Phacellophora. 



intermediate in character betwei n /'. camtschatica and P. oniata. 

 (Closely allied, probably identit.il. 



Phacellophora camtschatica Brandt. 



Phacellophora camticliatim. HKJ.M) i . i x ;S. M. ,,, . Vcad. Sci. St. P<tei bourg, tomi (,S( 6, p. ;dh, taf . 8. ACASIIZ, A^ 



I SI,;. N'ortli Amer. Acal., p. 44. H *t rki i . iSSo. S\ st. ,!, r \l. lusen, p. ;4t|. VAMH.I i i \. P|O,, Nordisches Plan: 

 Xr. 11, p. 58, fig. 13. 



Bell flat, 500 to 600 mm. wide. i> marginal sense-organs each hi-m-ath a lare. projecting, 

 coNcriii"; scale, which is flanked by 2 narrow, rhopalar lappets, each about halt as wide as the 

 coverinn-scale itself. I' 1 wide, nearl\ semicircular, \elar lappets, each cleft into - marginal 

 lappets. 16 crescent-shaped linear clusters ot leniacles anse tiom siihumhrella floor ot velar 

 lappets; the convexities of these crescents are inward and their horns outward, and each 

 consists of 2O to 24 tentacles. Tentacles about as |on as bell-i adms. The 4 mouth-arms .ire 

 wide, tapering, and thick, and about 1.5 times as lono ;is lu-il-iadius; then b|is are folded 

 in a curtain-like manner. Theie are 4 interradial, sac-! ike uonads with nanu . pel radial inter- 

 spaces between them. 'Uu uniral stomach gives list to I" iliopalar canals which send out 

 lateral branches, and also to X'> (5 16) simple unbranched \elar canals. There is a ring-canal 

 at the /one of the tentacles, on the outer inaigin of which theie anse 7 blindly ending, simple 

 diserticula in each velar lappet and a trident-shaped branch in the radius of each sense-organ. 



Bell colorless to bluish, gonads reddish-brown, canals vellow. tentacles light-violet. 



This medusa ranges along the shores of the \<nth 1'acitic from Kamtschatka to San 

 Francisco, California. It has not been figured since Meriens studied it. 



Phacellophora sicula Haeckel. 

 Phacillophora camt<chatic,i. H IK I\M',. < i. i \n R., 1878, Nerven ' t. mi .i Sinni organc Medu en, pp. 113, 114, taf. 9, fig. 15; 



t.lf. 10, fig. l6.~H*M KM. iSSn. S-, 1. !,-| Mr,]u CD, p. s^l. 



I'liMtllofiliara ambigua, KlsillNoevi , T')lo. |oiiinal College ol Si Fo\ ", \\. 2~ . ait. <|. p. il, I IIL'. 



The brothers llertwig describe the matginal sense-organs of this exceedingly ran 

 medusa and give a very diagrammatic riguie of a part of the bell-margin. 1 he\ \\ere appar- 



