273 



separated from all the hitherto known species by the shape of the 

 ciliated funnels, the miliary granules and the anchor-plates. Besides, 

 the unusual size of the anchors affords a good character for recog- 

 nizing this species. 



Pvotankyva asymmetrica (Ludwig). 



Synapta asymmetrica. Ludwig. 1875. Beitrage zur Kenntniss der 

 Holothurien. pag. 88, Pl. VI fig. 2. 

 Théel. 1886. u Challenger" Holoth. II, p. 28. 



Protankyra asymmetrica. 0stergr en. 1898. Das System der Synaptiden. 

 pag. 117, fig. 8. 



Sluiter. 1901. "Siboga" Holothurien. pag. 129, 

 Pl. X fig. 13. 



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



107, Pl. V fig. 35—36. 

 310 n., 1240 e. 22 fms. Suenson. 1882. 8 specimens. 

 31° N., 1250 e. 25 fms. Suenson. 1882. 1 specimen. 



Only two of the specimens at hand are complete. They measure 

 10 and 14,5 cm in length and are in alcohol nearly colour-less. 

 The body-wall is thin and, in the posterior end, quite translucent. 

 There are 12 tentacles, each with four digits. Sensory cups are want- 

 ing. The radial pieces of the calcareous ring are perforated for the 

 nerves. There are 3 — 4 polian vesicles, the two of which are, as 

 Ludwig writes, distinctly larger than the others. The stone-canal 

 is single. The gonads are rather long, being nearly three fourths 

 of the body-length; they are dichotomously branched. The intes- 

 tine is long and thin and with a large loop. The ciliated funnels 

 (Fig. 53. 8) are found on, and at, the base of the mesenteries. They 

 are usually united into clusters, and each funnel is, as in the 

 species ramiurna, dichotomously branched, the branches having the 

 shape of a cork-screw. 



The anchors are distinctly asymmetrical, and quite agree with 

 Lud wig's figures, except for the fact that anchors with smooth 

 arms are not found. The anchor-plates (Fig. 53. 1-2) are different 

 in the two ends of body. Those from the posterior end (Fig. 53. 1) 

 are oblong with a smooth surface and with smooth holes, and 

 those from the anterior end wider and their surface as well as their 

 holes (Fig. 53. 2) set with distinct teeth. 



Vidensk. Medd. fra Dansk naturh. Foren. Bd. 85. 18 



