123 



calcareous ring and the thick cartilaginous ring, make it easily 

 distinguishable from glabra, and shows that it may without any 

 doubt be referred to Fisher's species spectabilis. 



Opheodesoma glabra (Semper). 



Synapta glabra. Semper. 1868. Die Holothurien. p. 12, Pl. II & Pl. IV f. 8. 

 Opheodesoma glabra. Fisher. 1907. The Hawaiian Holothurians. pag. 723. 

 „ „ Clark. 1908. The Apodous Holothurians. pag. 74, 



Pl. V fig. 24. 



1924. The Synaptinae. p. 465, Pl. II f. 4—6. 



Amboina. 11. II. 1922. 1 — 2 m. Corals. 1 specimen. 



The specimen at hand measures 45 cm in length and is uni- 

 formly grey with white spots due to large heaps of miliary granules. 

 It has 15 tentacles each with ca. 25 pairs of digits united by a web. 

 On the oral disk there are eye-spots. The cartilaginous ring is well 

 developed, but it is not so voluminous that it encloses the thick 

 and solid calcareous ring (Fig. 4. 5). On the anterior margin of 

 each piece of the calcareous ring there is a conspicuous long pro- 

 cess, those on the radiais being perforated for the nerves. There 

 are numerous polian vesicles and madreporic canals, and the gonads 

 are branched. The intestine has a loop and on the mesenteries 

 there are small cup-shaped ciliated funnels. 



The anchors (Fig. 5. 16) measure from 270 to 280 ^ in length 

 by 160 to 170 in width. The stock is branched and on the vertex 

 there are minute knobs. The anchor-plates (Fig. 5. 3 — 8) measure 

 from 180—240 ^ in length and 140—180 fi in width. The smaller 

 plates have the articular end and especially the bridge somewhat 

 different from those in the larger ones. As in spectabilis rosettes 

 are found all over the skin, but in this specimen they are not 

 uniformly spread, but as said, often gathered into large heaps. 

 Rods (Fig. 5. 13) are only found in the oral disk. 



The specimen at hand differs distinctly from that of spectabilis. 

 Although the calcareous ring is faintly different from that of Sem- 

 per's type, cf. Die Holothurien Pl. IV fig. 8, I have no doubt in 

 referring it to that species. 



