ECHINODERMATA 97 



coral reefs of the East Indies and in water of moder- 

 ate depth in the tropics generally. Most of the sea- 

 lilies live in water of moderate depth in the tropics. 

 As in the case of other echinoderms, many of both 

 types live in very deep cold water. 



These animals, which in the present seas are 

 about as numerous as the starfishes, are very bony 

 and are therefore exceptionally adapted for fossili- 

 zation, so that their fossil record is unusually com- 

 plete. 



Hathrometra tenella Retzius 



(Feather star, Orinoid) 

 (Alectro derdata Say ; Antedon dentata Say) 



From a small button-like central portion radiate 

 10 long very slender arms each with two rows of 

 side branches so that it has the general appearance 

 of a feather, and also a large number of much shorter 

 curved processes. The color varies from dark green 

 dotted with white to light grayish brown with nar- 

 row darker bands. It lives in rather deep water. 



This species was originally described from Great 

 Egg Harbor, New Jersey in 1825 but has not been 

 found in coastal waters during recent years. It 

 lives in rather deep water from the Newfoundland 

 Banks to Chesapeake Bay. 



