ACTIN OPODOUS HOLOTHüfilOIDEA. Öl 



The dorsal processes cany numerous spinous rods and tables with 

 very long spires." (The el 188(3, p. 193). 



RemarlxS : — Color in alcohol white, while in the formalin speci- 

 men the pale pink color is still retained. The body wall is 

 comparatively thin and the five radial muscles are recognizable 

 from outside. 



The appearance of the animal when living seems to be dif- 

 ferent from its present condition. Aoki described it from the 

 first specimen captured as follows : — " The body was very tliin 

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

 glided on in tlie vessel. Color w^as that of a peach blossom 

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



On the ventral surface the median unpaired ambulacrum is 

 entirely naked. Eacli lateral ambulacrum showx'd two rows of 

 pedicels generally alternate in position. These cease to exist a 

 short distance from the edge of the moutli. The outer row runs 

 somewhat (o mm.) within the lateral l)order on the ventral surface. 

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

 margin between the dorsal and ventral surfaces. The row gcjcs 

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

 the ventrally placed moutli. Posteriorly the row passes below the 

 subdorsally placed anus. The number of these papillae on ')ne 

 side (from the anterior to the posterior median point) is about (iO. 

 In their present state, the papillae are only al)Out 1.5 mm. higli. 

 Papillae on the dorsal surface proper are rather scattered and 

 larirer than those of the edge. Althouu-h tliev are most numerous 

 and largest on the two dorsal ambulacra, there are some smaller 

 ones scattered on the interambulacra. There are three or foui- 

 specially large ones near tlie anterior end belihid the marginal 

 row of papillae and iilso near the i_)osterior end. These seem to 



