674 



MEDUSAE OF THK WORLD. 



which are hardly half as long and one-fifth as wide as the velar lappets. The marginal sense- 

 organs are similar to those ot Catostylus. The ring-muscles of the subumbrella are very 

 powerfully developed, but are partially interrupted over the 8 ocular radial-canals. The arm- 

 disk is about as wide as the radius of the umbrella. It is 8-sided, the narrow sides being in 

 the radii of the arm-pillars; and the wide sid'es, which are 3 times as wide as the others, are 

 in the radii of the 4 subgenital ostia. The subgemtal ostia are thus 3 times as wide as the arm- 

 pillars between them. 



8 thick mouth-arms arise from the arm-disk, and these are about as long as the bell- 

 radius. The lower part of the arm is somewhat longer than the upper. There are 2 well- 

 developed, thick, dorsal mouth-lamellae or "wings" which project from the lower arm and 

 these fuse with the ventral mouth-lamella at the pointed end of the arm. The ventral side of 

 the mouth-arm is complexly folded and gives rise to lateral lappets. The filaments, which 

 arise at the ends of these lappets between the mouths, are shorter than in the mature L. lucerna. 

 The 4 sides of the genital organs are bent at right angles, thus forming a cross of 4 right- 

 angled membranes which are very much folded. The gastrogenital cavity and subgenital 

 porticus are small and much reduced. 



16 radial-canals (8 ocular and 8 interocular) emerge from the cruciform, central stomach. 

 These 16 radial-canals are put into connection one with another by a wide ring-canal which 

 is about half-way between the center and the margin. Peripheral to this ring-canal there is 

 a network of vessels, although the 8 ocular canals run through and fuse with this network. 

 32 blindly-ending, centripetal vessels extend inward from the ring-canal toward the center of 

 the disk, but they end blindly before reaching the edges of the stomach. There are 2 of these 

 blindly-ending diverticula between each successive pair of radial-canals, and in some cases 

 they fuse one with another. Color (?) 



Found at Pernambuco and at Contigeriba on the coast of Brazil. The most complete 

 description is that of Vanhoffen, 1888, from which the above has been mainly derived. 



I am inclined to believe that this medusa will prove to be only a young stage of Lvcli- 

 norhiza lucerna Haeckel. The marginal lappets, mouth-arms, and canal-system are similar 

 in both. According to Haeckel the bell is flatter and thinner in L. lucerna than in L. flagellata; 

 also in the mature L. lucerna the gonads protrude through the subgemtal ostia, but this may 

 be due to defects in preservation or to the general breaking up of these organs which commonly 

 occurs in medusae when the genital products are set free. Vanhoffen did not compare his 

 specimen of L. flagt-Ilatn with Haeckel's type in the Berlin Museum. The only distinguishing 

 features according to the accounts ot Haeckel and Vanhoffen are as follows: 



*Vanhoffen docs not state the size of his specimen. 



The presence of a unitary subgenital porticus in " L. fla^cllata" is its only really distinctive 

 character, but this is often highly variable in development in different specimens ot the same 

 medusa. See Maas, 1903, Scyphomedusen Siboga Exped., p. 36. 



Lychnorhiza bartschi, sp. nov. 



Named in honor of Dr. Paul Bartsch to whose care and skill the excellent preservation of 

 the medusae upon the Philippine expedition ot the Albatross is due. 



Bell 74 mm. wide, flatter than a hemisphere and with smooth exumbrella surface. Gelat- 

 inous substance thick but not very rigid. 8 rhopalia, each with an ocellus and an exumbrella 



