ECHINODERMATA OF NEW ENGLAND. 45 



zoo ids may be described here. A Diphyzooid is a frag- 

 ment of a Calycophore which has an independent life. 

 Two forms of Diphyzooids have been found in Narragan- 

 sett Bay. They are known as Eudoxia Lessonii and Di- 

 plophysa inermis. 



Diplophysa inermis. This species is the diphyzooid of 

 Monophyes gracilis, and in the cycle of development we 

 have, according to Chun, stages corresponding with the 

 following genera : 



1. Monophyes. 



2. Muggiaea. 



3. Diplophysa. 



Monophyes has not yet been recorded from New Eng- 

 land. Muggiaea has been taken once or twice. 



Order IV. Acraspeda. 



Body or umbrella, disk-shaped. Sense bodies with a 

 hood. Velum obscure. Without a bell cavity. Body gel- 

 atinous, flexible, convex above, generally colored. From 

 centre of under surface hang long projections, or curtain- 

 like folds, which enclose a stomach. Filaments (tentacles) 

 arranged in bundles or simple rows around or near the disk 

 margin. Sense bodies alternating with the tentacles on 

 the bell rim, covered with "hoods." 



A. Eight sense-bodies on umbrella margin. 



Cyanea. 

 Aurelia. 

 Dactylometra. 



B. Sixteen sense-bodies on umbrella margin. 



Callinema. 



A. I. 



I. Body red ; mouth parts in folds ; tentacles long, con- 

 spicuous, in clusters Cyanea. 



