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coat of dark brown or purple papillae, which lend to the anterior end 

 of the specimens a dark brown colour. The posteriormost end is 

 lacking the coloured papillae, for which reason it is grey. There 

 are ten tentacles, each of which has 7 pairs of digits. Sense-organs 

 are not found, neither on the tentacles nor on the oral disk. The 

 calcareous ring (Fig. 69. 14-15) is rather interesting as it is, like 

 the ring of Labidoplax variabilis Théel, bilaterally symmetrical. 

 The radiais are not distinctly different from the interradiais, not 

 being perforated for the nerves. The calcareous ring is somewhat 

 differing in the two specimens at hand. The lateral pieces agree 

 quite well, but the mid-dorsal and the mid-ventral pieces are dis- 

 tinctly different (Fig. 69. 12-13). The two specimens are of different 

 sex, but whether the differences in the calcareous rings correspond 

 with the sexes cannot be ascertained from only two specimens. The 

 retractor-muscles are large, but united with the body-wall by a 

 mesentery-like tissue. There is a single large polian vesicle and 

 one stone-canal. The madreporite is of different shape in the two 

 specimens (Fig. 69. 9-10). The alimentary canal is straight and so 

 filled with sand that it nearly quite fills out the body-cavity. 



The ciliated funnels are found at the base of the mesenteries. 

 They are long-stalked and not united into clusters (Fig. 69. 11). 

 The sexes are, as said, separate and the gonads are branched. The 

 genital duct opens on a very long papilla found in the dorsal inter- 

 radius, somewhat behind the tentacles. 



In the body-wall no other calcareous deposits are found than 

 sigmoid-shaped bodies. These are gathered into groups, which are 

 lying beneath the coloured papillae (Fig. 69. 1). The sigmoid bodies 

 are not lying in the papillae as in Trochodota dendyi, and the whole 

 papilla may be removed without disturbing the arrangement of the 

 hooks. In the posterior end of the specimens the arrangement of 

 the hooks (Fig. 69. 2) quite agrees with Thé el's figure in the 

 Challenger Holothurioidea II, Pl. II fig. Ill, and leaves no doubt 

 as to the identification of the specimens at hand. The sigmoid 

 bodies are of somewhat varying shape (Fig, 69. 3-9) and have often 

 the inrolled ends divided into a few short, pointed branches, quite 

 as in Tœniogyrus contortus. The sigmoid bodies measure in the 

 posterior end of the specimens ca. 139 — 140 fi and in the anterior 

 end of the specimens 100 — 120 /a. In the tentacles there are some 



Vidensk. Medd. fra Dansk naturh. Foren. Bd. 85. 21 



