SCYPHOMEDUSAE COLLECTED BY STEAMER ALBATROSS. 



217 



LYCHNORHIZA BARTSCHI Mayer. 



Lychnorhisa hartschi Mayer, 1910, Medusae of the World, vol. 3, p. 674, 

 figs. 413, 414. 



Named in honor of Dr. Paul Bartsch, of the United States National 

 Museum, to whom we owe the excellent preservation of all specimens 

 of medusae which 

 passed through his 

 hands. 



Bell 84 mm. wide, 

 natter than a hem- 

 isphere and with 

 smooth exumbrella 

 surface. Gelatin- 

 ous substance thick 

 but not very rigid. 

 Eight rh op alia, 

 each with an ocellus, 



I L 11 FlG- 1 ^ - — Lychxorhiza eartschi from Jolo Anchorage, 



ana an eXUmDreiia Philippine Islands. A, Oral view; n, notch in the 



sensory pit with perradial column of the arm disk ; sgo, sdbgenital 



i i ;.• £ _ OSTIUM. B, Rhopalium from the exumbrella side. 



dendritic iurrows 



over its floor. About 96 (8X12) lappets, 10 bluntly pointed velar 

 lappets between 2 somewhat smaller ocular lappets in each octant. 

 Arm-disk 51 mm. wide where it arises from the subumbrella, but 

 only 47 mm. wide at the level of origin of the 8 mouth-arms. The 

 4 subgenital ostia are crescent-shaped and each is covered above by 



a gelatinous flap. They are only half as 

 wide as the perradial columns between 

 them. Each perradial column exhibits a 

 niche on its outer side which bears a super- 

 ficial resemblance to the subgenital ostia. 

 The subgenital cavity is unitary. 

 ' The 8 mouth-arms are laterally com- 

 pressed and 36 mm. long, the lower 3- 

 winged parts of the arms being 24 mm. 

 long and 23 mm. wide. Numerous simple, 

 laterally flattened, tapering filaments arise 

 from between the frilled mouths on all 

 sides of the mouth-arms and from the arm- 

 disk. The filaments upon the arm-disk are 

 about 30 mm. long, but those from the outer parts of the mouth- 

 arms are shorter. 



The central stomach is cruciform and about 46 mm. wide. Sixteen 

 simple radial-canals, 8 rhopalar and 8 adradial. These are all put 

 into intercommunication with a wide ring-canal which is at some 

 distance inward from the margin. The adradial-canals terminate 



Fig. 18. — L tchnorhiza 

 bartschi. Side view. Let- 

 tering as in figure 17. 



