266 



Protankyra suensoni n. sp. 



22° 10' N. 114° 30' E. 18 fms. Suenson. 1882. 2 specimens. 

 400 23' N. 129° 33' E. 140 fms. Suenson. 1882. 1 specimen. 



None of the specimens at hand are complete and only one 

 (from 22° 10' N., 114° 30' E.) is a fore-end. The species must 

 be a relatively large one, as the type-fragment, though exceedingly 

 contracted, measures 2,5 cm in diameter (uncontracted it may be 

 ca. 4 cm in diameter). The body-wall is, perhaps due to contraction, 

 very thick and stiff. The colour is in alcohol pale yellow. Each 

 of the radial muscles is by a deep furrow divided into two nearly 

 triangular parts, the sides of which measure ca. 5 mm. There are 

 twelve tentacles, each with four digits and a very large number of 

 diminutive, sensory cups, spread over the whole oral side. They are 

 so small that they are hardly seen by the unarmed eye. The tentacle- 

 muscles are as in magnihamula (cf. p. 271) fastened to both the inner 

 and the outer side of the calcareous ring. There are 15 large polian 

 vesicles of very nearly the same size, and a single, twined stone- 

 canal with a thin and weak madreporite. The gonads (Fig. 50. 5) 

 are, although empty, very voluminous. They consist, on each side, 

 of a large and wide uterus, with 5 — 8 branches, all on the same 

 side of it. The oesophagus is very thin and for that reason most 

 likely different from the intestine. But as the intestine is lacking, 

 this cannot be ascertained. The ciliated funnels (Fig. 50. 3) are 

 long and slender, and usually united into stalked clusters. 



There is found only one sort of anchors (Fig. 50. 1-2). They 

 measure, in the type-specimen, 850 ju in length and 500 p in width, 

 but in the fragment from 40° 23' N., 129° 33' 0., they are con- 

 spicuously longer, measuring 1000 — 1 150 ^ in length and ca. 650 ju 

 in width. As the two fragments agree pretty well in all other re- 

 spects, the suggestion lies at hand that the large difference in the 

 size of the anchors may be due to the fact that they belong to dif- 

 ferent parts of the body. The stock of the anchors is finely dented 

 and the arms are serrate. The serration is unusually faint and re- 

 gular (Fig. 50. 2). 



The anchor-plates (Fig. 51. 2) measure in the type ca. 700 fi 

 in length and 550 fi in width. In the other fragment they measure 

 800 [i in length and 650 ^ in width. The shape of the plates is 

 rather characteristic, the articular end being square. The anterior 



