303 



papillae are entirely wanting in the ambulacra, for which reason 

 the specimen at hand has five dark stripes, one in each ambula- 

 crum. It has 12 tentacles of the same colour as the body. On 

 each tentacle there are 7 pairs of digits. The calcareous ring con- 

 sists of twelve pieces, of which the five radiais all have a very large 

 perforation for the passage of the nerves (Fig. 64. 1). All the pieces 



Fig. 64. Chiridota stuhlmanni. 1 pieces of calcareous ring X 24. 2 Ciliated 

 funnels x 90. 3 madreporite X 315. 4 rods from digits X 225. 5 rods from 

 body-wall x 210. 6 spicules from posterior end of interambulacra x 225. 

 7 spicules from gonad x 225. 



of the calcareous ring have a distinct pr. J- on the anterior 

 margin, and the muscular impressions ar. "here are twelve 



polian vesicles and a single curled stone-ca^ ! * : he polian vesicles 

 are of different size and the calcification of the madreporite is ring- 

 shaped (Fig. 64. 3). The gonads are branched, rather voluminous 

 and enclose nearly ripe eggs, measuring ca. 120 jti in diameter. 

 The genital duct opens on a little papilla close behind the dorsal 

 tentacles. The alimentary canal has a large loop, and on the me- 

 senteries there are, as mentioned by Lam pert, two different sorts 

 of ciliated funnels (Fig. 64. 2). The large funnels are only found 



