95 



Family jEQUORIDjE Esch. (rest AG.) 



jEquorirhc ESCH. (emend. Agass.). Syst. d. Acal., p. 108. 1829. 

 jEquoridw AGASS. Cont. Nat. Hist. U. S., IV. p. 359. 18G2. 



RHEGMATODES A. AGASS. 



Rhegmatodes A. AGASS. ; in Agass. Cont. Nat. Hist. U. S., IV. p. 361. 1862. 



Umbrella flat, chymiferous tubes numerous, digestive cavity short, 

 with small lips scarcely fimbriated ; the chymiferous tubes extend 

 along the prolongation of the umbrella into the cavity of the bell ; 

 large tentacles, somewhat more numerous than the chymiferous tubes, 

 very contractile. To this genus I suppose that Gosse's ^Equoreaforbes- 

 iana belongs; it is closely allied to Stomobrachium Brandt (non Forbes), 

 and differs from it in not having numerous long marginal tentacles, in 

 the greater number of radiating tubes, and the numerous short lips at 

 the extremity of the digestive cavity. Like ^Equorea and Zygodactyla, 

 it has marginal capsules, and the peculiar spur at the base of the large 

 tentacles. Two species of this genus have been noticed on our coast ; 

 the one in Florida, bv Professor Agassiz, and the other at Naushon. 



Rhegmatodes tenuis A. AGASS. 



Rhegmatodes tenuis A. AGASS. ; in Agassiz's Cont. Nat. Hist. U. S., IV. p. 361. 1862. 



This is a large species ; specimens measuring between three and four 

 inches have frequently been found. The spherosome is thick (Fig. 136) 

 along the polar axis, bulging, in the shape of a rounded obtuse cone, 



Fig. 136. A profile view, natural size, of Rhegmatodes tenuis. 



