rate researches of the distinguished J. Miiller. He figures the 

 earliest stage of the larval Holothurian, which he calls an "Auric- 

 ularia." The course of de- 

 velopment is much as in 

 the starfishes. The earliest 

 stage known resembles 

 that of the starfish repre- 

 sented by Fig. 93. It then 

 passes through a stage re- 

 presented by Fig. 'JO. when 



a stage analogous with Fig. 

 98. The Auricularia when 

 fully grown, is cylindrical, 



laria. Before it becomes 

 fully formed the young 

 Holothurian begins to 

 grow near the side of the 



Holothur 

 rhe ear-lil 



■idled 



is gradually absorbed and the young Holothurian >trikingh re- 

 forms observed by Miiller, the intestine of the embryo Holothurian 

 could be observed twisted on itself, with the mouth surrounded by 

 tentacles. The only observations published on our native Holo- 

 thurians are those of Mr. A. Agassiz, on Cuvieria, our large red, 

 heavily plated sea-cucumber, which inhabits stony bottoms in deep 

 water. The young are of a brilliant vermilion. In the earliest 

 stage observed by Mr. Agassiz (Fig. 110 ?, "pupa;" g, tentacles) ; 



