ACTINOPODOUS HOLOTHUEIOIDEA. 11 



may be compared to the brim. On the dorsal surface, there are 

 much more slender papillae scattered apparently without any 

 regularity but with a tendency, it seems to me, to be arranged 

 over the two ambulacra. There are two Polian vesicles. No 

 calcareous spicules can be discovered in the skin. Neither can 

 the calcareous ring be discovered. 



It is with very great hesitation that I connect the name of 

 Paelopatidcs piirpiireo-pimdahis of Sluiter with this species, but 

 after repeated and careful perusals I can not helj:) having a 

 suspicion that it belongs there, and I simply record that suspicion. 

 This is very much strengthened by the presence in my specimens 

 of the blind sac mentioned by Sluiter (p. 44) as occurring in 

 the anterior part of the digestive tube. In my specimens, the 

 blind sac should be described as consisting of two parts : one 

 larger dark violet or purple part lobulated and evidently glan- 

 dular, and a second lighter- colored gland-hke part attached to 

 the duct of the first. They seem to open not much behind the 

 circular canal. 



The sexual organs are very long, and bundles of smaller 

 bundles in front of well-developed tubes are very distinct. Two 

 respiratory trees are well developed and reach quite to the 

 front. 



ioca^ :— " Cliallenger " Stat. 235 (Théel '8G) ; " Siboga " Stat. 316, 

 314, 101 (Sluiter : 01) ; Siu-uga Bay. 



Genus Synallactes Ludwig 1893. 



Body cylindrical or subcylindrical. 20 ( — 18) tentacles. No 

 tentacular ampullae. Stone -canal attatched to the body wall. 

 Ventral surface flattened but without any marginal border. Ventral 



