30 PEOF. A. DENDT ON THE 



evidently the contracted tentacles wbicli Hutton describes as 

 " papillae " in the neigbbourhood of tlie mouth. In fresh speci- 

 mens the body is of a dull purple colour, and the tail greyish 

 yellow. The tentacles are orange, sometimes streaked longitu- 

 dinally with pink. The body-cavity is filled with a large quantity 

 of thin, reddish-brown liquid, resembling blood, to the presence 

 of which the dull purple colour of the animal is largely due. 

 The integument in fresh specimens is smooth and subglabrous all 

 over, transversely wrinkled only at the root of the tail. It is thin 

 and soft in the region of the body, though tough. It appears 

 firmer in the tail because of the absence of any large, fluid- 

 containing body-cavity therein. 



The alimentary canal appears to be quite typical. It consists 

 in the swollen "body" of three limbs, descending, ascending 

 and, descending, forming the usual S-shaped loop, the last limb 

 ending in the long, slender rectum, which occupies the whole of 

 the tail and is attached to the body-wall by radial muscle-fibres. 

 The two respiratory trees, attached to the commencement of the 

 rectum, are large and very copiously branched. 



The longitudinal muscles are powerfully developed, each con- 

 sisting of two distinct bands with a deep groove between thera. 

 There are no properly developed retractor muscles, but these are 

 probably represented by certain small slips of muscle which arise 

 one from each half of each longitudinal muscle near its anterior 

 end, and unite together in pairs to become attached to the radial 

 plates of the calcareous ring. 



The ambulacral ring has a single, sausage-shaped Polian 

 vesicle, placed ventrally, and a single small madreporic canal, 

 placed dorsally close to the genital duct. There are fifteen 

 elongated tentacular ampullae. 



The sexes are distinct. The reproductive organs are bulky 

 and consist of a great number of copiously branched, slender, 

 moniliform tubes, attached near the anterior end of the body to 

 the single short dorsal genital canal. 



The pharyngeal skeleton (PL 3. fig. 18) consists of a complete 

 calcareous ring of ten pieces. The five radials are rather large, 

 and each ends posteriorly in a bifid prolongation. The interradials 

 are small and simple, wedged in between the anterior ends of 

 the radials. The anterior margin of the ring is provided with 

 fifteen small sharp teeth, two belonging to each radial and one to 

 £ach interradial. 



