528 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



[16] 



Pegantha, sp. 



[Plate 1.] 



The sexual bodies divided into a number of separate sacs pendant 

 from the abaxial lower wall of the stomach. The sexual glands do not 

 enter the umbrella lobes but alternate with the attachments of the 

 tentacles, which they equal in number. No coronal fossa.* 



Specimen examined. 



Bell, crown-shaped, twice as broad as high, with stiff gelatinous walls. 

 The bell is thick, biconvex, firm. The marginal lobes folded inward 

 on the oral side so that they are with difficulty bent back to normal 

 position without rupture. Exumbrella crossed by strongly-marked, 

 prominent radial ridges, separated by radial furrows. These ridges 

 and furrows arise from the center of the exumbrella in the radii of the 

 marginal lappets and divide, sending off lateral branches which pass 

 into the marginal lappets. 



The collar of the umbrella, or the peripheral portion of the bell, is 

 made up of thirteen horseshoe-shaped marginal lobes with festoon 

 canals. These lobes are connected by a thin membrane which unites 

 contiguous lobes and skirts their borders. The specimen was not well 

 enough preserved to observe the sense-bodies. 



The subumbrella is divided into two regions, one corresponding with 

 the central disk and marked by the lower stomach wall; the other with 

 the collar region formed by the horseshoe lappets. The mouth opening 

 is simple. The lower stomach wall thick, well marked.. The sexual 

 sacs form a number of pouches upon the outer rim of the lower stomach 

 wall. They appear as folds or separated sacs, the exact number of 

 which could not be determined in the single specimen studied. There 

 are thirteen sexual glands, each of which lies in an internemal radius. 

 An open niche is formed in each marginal lappet, as described by 

 Ha?ckel, in which the sexual organs are forced when the medusa bends 

 inward the lobes of the collar. There are thirteen tentacles, each of 

 which arises in the incisions formed by the horseshoe-shaped festoon 

 canal. They are long and slender, apparently hollow, and have the 

 same color as the bell. 



* The surface of the exumbrella is continuous and without division between tbo 

 disk part of the umbrella and the marginal lobes. 1'. pantheon, which this species in 

 some respects closely resembles, has a "deep horizontal coronal fossa." 



