ACIINOl'OI'Ol S IIOLOTHURIUIDEA. 37 



The dursal jiroeesscs wiiTv liiiiiici'oiis spiiHiiis rodsiiinl (iiMcs witli 

 very Ion,!,' spires."' (Tiii'Ei. JS,S(i, p. 111;;). 



h'cHiarh : — (olni' in jik'dlidl white, wliilc in lh«' I'oi'miiliu speei- 

 inen the pule pink color is still retained. Tlu^ body wall is 

 eompai'atively thin and tiie live I'adial muscles are reco<,'ni/caI)le 

 from outside. 



The appearance of the animal when living scorns to lie dif- 

 ferent from its present condition. Aoki described it from the 

 lii'st specimen captured as follows : — " The body was very thin 

 and Hat, and made peculiar twisting or rotating movements as it 

 glided on in the vessel. Color was that of a peach blossom 

 (deep pink). Its length was about twice what it is now." 



On the ventral surface the median impaired ambulacrum is 

 entirely naked. Each lateral ambulacrum showed two rows of 

 ])odicels generally alternate in position. These cease to exist a 

 sliort distance from the edge of the mouth. The outer row runs 

 somewhat (3 mm.) within the lateral border on the ventral surface. 

 A closely set single row oi small papillae is placed on the body 

 margin between the dorsal and ventral surfaces. The row goes 

 around the anterior edge of the body in front of, and dorsal to, 

 the ventrally placed mouth. I'osteriorly the row passes below the 

 subdorsally placed anus. The nnmber of these papillae on one 

 side (from the anterior to the jwsterior median ])oint) is a])Out (JO. 

 In their jireseiil state, the ]ia])illae are only about \ .~> mm. high. 

 l'aj)illae on the dorsal sni-facc projK'r are I'atiiei' scattered and 

 larger than those of the edge. Although they are most numerous 

 and largest on (he two dorsal ambulacra, there are some smallei' 

 ones scattered on the inferarnbuhicra. There ai-e iliree or four 

 specially large ones iieai' the anterior end behind the niai'ginal 

 row of papillae and al.so near tiie posti'rior end. These seem to 



