THE APODOUS HOLOTHUKIANS 73 



ranging throughout the Indo-Pacific region, between 50 E. and 155 "W. longi- 

 tude and 20 N. and 20 S. latitude, although it has not yet been found about 

 either Ceylon or the Philippines. 



REMARKS. Fisher ( : 07) gives a very good account of the appearance in 

 life and the anatomy of this species. It occurs among pebbles and coral on 

 sandy or gravelly bottoms, in the Hawaiian Islands, but is apparently not very 

 common. 



EUAPTA LAPPA. 



PLATE IV, PIGS. 23-25. 



Synapta lappa Miiller, IfiO, p. 134. Calcareous ring, with some anatomical details, 



in Miiller, 1854, pi. x, fig. 4; calcareous particles, pi. vi, fig. 17. 

 Synapt-a polii Ludwig, 1874, p. 80. 

 Euapta lappa Ostergren, 1898&. 

 Euapta polii Ostergren, 1898&. 



LENGTH. 200-450 mm., with diameter 15-20 mm. 



COLOR. Silvery gray, finely mottled with black and white; interradii often 

 distinctly darker, the specimen appearing imperfectly longitudinally striped; 

 occasionally the ground color is brown and the longitudinal stripes almost 

 black; the numerous white specks are due to the crowded miliary granules. 



DISTRIBUTION. Reported from "West Indies" (Miiller); Gomera, off Ten- 

 eriffe (Theel) ; Barbados (Ludwig) ; Jamaica and Porto Rico (Clark) ; Ber- 

 muda (Clark, antea) ; probably ranging throughout the Caribbean Sea and 

 southward along the coast of tropical America ; not yet known from Florida, but 

 extending eastward to the Canary Islands. 



REMARKS. This species is quite common under fragments of coral rock on 

 sandy bottoms near the reefs about Jamaica. It is sluggish in all its move- 

 ments and apparently feeds on particles of organic matter pushed into the 

 mouth by the tentacles, which seem to be in constant movement. It is not at 

 all subterranean in habit, nor does it seem to occur among the living corals. 

 How long individuals remain under one piece of rock is an open question, but 

 they were never observed moving from one place to another, and it is quite pos- 

 sible that they remain throughout adult life in a single place. At the base of 

 each tentacle is a pair of conspicuous black pigment-spots, though whether they 

 function as light-detecting organs was not determined by the few observations 

 made. Ludwig 's description of his solitary specimen from Barbados, which he 

 named polii, leaves no doubt in my mind that it is identical with Miiller 's lappa. 



OPHEODESOMA Fisher, 1907. 



Tentacles pinnate, 14-16. Digits numerous, 10-35 on each side. Polian 

 vessels numerous. Stone-canals numerous. Anchors as in Euapta. Anchor- 

 plates with large central hole surrounded by six (rarely seven) large holes, all 



