714 



MEDUSAE OF THE WOULD. 



Cannorhiza connexa Haeckel. 



Cannorhiza connrxa, HAECKEL, 1880, Syst. dor Medusen, p. 605, taf. 40, fign. 1-8. VANHOFFEN, 1888, Bibliothrca Zoologica, 

 Heft. 3, p. 39. 



Bell flatly rounded, exumbrella surface finely granulated, 80 mm. wide, 30 mm. high. 

 Gelatinous substance tough and horny in consistency. 8 rhopalia. 80 marginal lappets. 

 In each octant are 8 small, rectangular, velar lappets between 2 small, oval, pointed, rhopalar 

 lappets. The 8 mouth-arms are fused along their sides forming a mouth-arm-cylinder. Each 

 mouth-arm is cylindrical, somewhat longer than the bell-radius. The short, free, lower end 

 of each mouth-arm is simple, unbranched, curved oulward and somewhat upward. The 

 lateral fusions of the 8 adradial mouth-arms are marked by 8 longitudinal furrows, the 4 

 perradial being shallower than the 4 interradial. The frilled mouths are developed only on 

 the lower sides of the mouth-arms and there are neither filaments, clubs, nor other appendages. 

 The 4 interradial, subgenital ostia are not quite as wide as the perradial spaces between them, 

 and the arm-disk is not quite as wide as the bell-radius. There is a cruciform unitary sub- 

 genital porticus and the 4 gonads are in the side walls of this space, the cruciform root being 

 thick and gelatinous. The 4 genital membranes are much folded. The cruciform central 



stomach lies above the subgenital porticus from 

 which it is completely separated by the lateral 

 genital membranes and gelatinous, cruciform 

 roof of the porticus. 



A wide canal extends downward from each 

 of the 4 perradial corners of the stomach, through 

 the columns, into the arm-disk, where they fuse 

 at the center, forming a small cavity from which 

 arise the 4 pairs of canals leading down the lower 

 sidesof the 8 adradial mouth-arms. Eachmouth- 

 arm canal gives off numerous short side branches 

 which lead to the frilled mouths. 24 radial- 

 canals arise from the margin of the cruciform 

 stomach and extend outward into the subum- 

 brella. The 8 perradial and interradial canals 

 are about twice as wide as the others. The 4 

 perradial canals are very short and the 4 inter- 

 radial very long. All 24 canals give off anas- 

 tomosing side branches and then fuse with the ring-canal. The ring-canal, in turn, gives 

 rise on its outer side to a fine-meshed network of narrow, anastomosing vessels which ramify 

 through the lappets. Found near New Zealand, South Pacific. Described in detail by Haeckel. 



"Stomatonema reticulatum" Fewkes. 

 Stomalonema reticulatum, FEWKES, 1884, American Naturalist, vol. 18, p. 300. 



Bell 36 mm. wide, with thick walls, thinner at margin. There are no marginal tentacles. 

 There are 8 marginal sense-organs which bear some resemblance to those of Aurellia. Shape 

 and number of marginal lappets ( r) The 8 mouth-arms arise from the arm-disk by 4 attach- 

 ments and are bordered on their lower sides by a double row of mouths which also extend 

 half-way up the upper side of each mouth-arm. 4 large, globular, ovarian sacs he in the 

 interradii of the arm-disk alternating with the 4 primary branches of the mouth-arms. A 

 number of radial-canals arise from the central stomach and fuse with a narrow zone of anas- 

 tomosing vessels at the bell-margin. Fewkes does not state how many radial-canals there are 

 in this medusa, nor does he give any account of the marginal lappets, musculature, relative 

 sizes of the parts of the medusa, color, gonads, or mouth-arm-appendages. He mentions a 

 single specimen found in Montevideo Harbor, Atlantic coast of South America. 



The descrip;ion given by Fewkes is unfortunately too fragmentary even for generic 

 determination, but apparently the medusa is related to Haeckel's Aurosa, but is distin- 

 guished by having mouths on the dorsal as well as on the ventral sides of the 8 mouth-arms. 



FIG. 425. "Cannorhiza conne.va" after Haeckel, in Das 

 Syst. der Medusen. 



