686 MEDUS.E OF THK WOULD. 



Versura vesicata. 

 Vtriura vtiitaia, Hacckcl, 1880, Syst. <ler Mcdusen, p. 645. 



This is very briefly mentioned by Haeckel. It is closely related to, it not identical with, 

 /'. piilnuitci, but has twice as many velar lappets. The ocular clefts in the margin are deep 

 and the subgenital ostia are onl\' halt as wide as the pillars between them. The vesicular 

 club at the end of each arm is larger than in F. palmata, being one-fourth as long as the bell- 

 radius. Northwestern coast (?) of Australia. Size, etc. (?) 



Versura pinnata Haeckel. 



Versura pinndta, Hatckkl, tSSo, Syst. dcr Mcdusen, p. 607. 



This Cocos Island medusa is very briefly described by Haeckel. Hell flat, 80 mm. wide. 

 8 deeply-cleft rhopalar niches. 144 lappets. In each octant 16 indistinct quadratic velar, 

 between 12 small, pointed, ocular lappets. Suhgenital ostia as wide as the columns between 

 ihem. Mouth-arms somewhat longer than bell-radius and twice as long as wide. It may be 

 identical with /'. palmaia, being described onl\- trom a preserved and presumably contracted 

 specimen. 



Versura anadyomene. 



Croisosloma anadyomene, Maas, 190^, .Scyphomcdusen dcr Sibo^a Expedition, Monojj. 11, p. 56, taf. 7, fign. 65-68. 

 Crossostomay sp., Goettc, 1886, Sitzungsbcr. Akad. Wissen., Berlin, Jahrg. 1886, p. 837. 



Bell about 200 mm. in diameter and quite flat. Exumbrella covered with a network 

 of anastomosing furrows, leaving polygonal elevations between them. This network is wide 

 at the center and tiner-meshed at the margin, and the general trend of the furrows is mainly 

 outward trom the center. Gelatinous substance of bell verv thin, being only a few millimeters 

 thick even at center. The canal-svstem can be seen h\- looking through the bell from the 

 exumbrella side. There are 8 marginal sense-organs, 4 perradial and 4 interradial. These 

 are small and probably lack ocelli, and on the exumbrella side above each sense-organ there 

 is a small, simple sensory pit without radiating furrows. The 16 ocular lappets which flank 

 the 8 marginal sense-organs are small and lanceolate. In each octant between sense-organs 

 are 8 large, semicircular velar lappets, which alternate somewhat irregularly with about 8 

 small, narrow, tongue-shaped lappets. The arm-disk is rectangular to cruciform, with long 

 interradial slit-like, subgenital ostia and 4 narrow, perradial pillars between them. The 

 subgenital sinus is a flat, narrow, cruciform space and the genital cross is very narrow. The 

 medusa is very delicately t'ormed, the lower pans of the mouth-arms being thin and leaf-like. 



Each ot the 8 mouth-arms is about as long as the bell-radius and verv strongly compressed 

 laterally. The upper part of the arm has the form of a knife blade, the sharp edge being 

 inwards (axial) and the thick, rounded side being abaxial. Two rhomboidal, expanded, 

 leat-like wings arise from the abaxial side of each arm. The lower sides of the two lateral 

 wings and the inner (axial) part of each arm gives rise to numerous, flat, membranous side 

 branches which expand outwardly. These side branches bear the frilled mouths. Small 

 club-shaped vesicles arise from between the mouths of the two lateral, abaxial wings of each 

 mouth-arm, while the ventral side of each mouth-arm gives rise solely to tapering tilaments 

 between the mouths. The rows of frilled mouths on the inner (axial) sides of the mouth-arms 

 extend to the center ot the arm-disk, where thev form a projecting rosette. 



A main canal arises from each of the 4 perratjial corners of the stomach and sends branches 

 into the mouth-arms. It is remarkable that each of the lateral, abaxial winss of the lower 

 arms contam 2 separate axial-canals, each of which sends ofl^ side branches to the mouths. 

 These side branches do not anastomose and thus there is a double canal-system in each of 

 the lateral wings of the lower arms. 



The central stomach is cruciform, the arms of the cross being perradial. 4 perradial 

 canals extend uninterruptedly from the 4 angles of the central stomach to the 4 perrailial 

 sense-organs. The 4 canals to the interradial sense-organs do not arise directly trom the 

 stomach, but from 4 areas of anastomosing vessels which forin a network on the interradial 

 sides ot the central stomach. These network-like areas of vessels arise in numerous canals 

 from the entire interradial sides of the stomach. They send out a few branches which join 



