241 



them in a table. My own results are found by measuring ca. 200 

 anchors and plates from each end of ten different specimens, five 

 of ooplax and five of lœvis. 



Observator 



Locality 



Anterior 



Posterior 



Anchors 



Plates 



Anchors 



Plates 



v. Marenzeller. . . 



Japan . ... 



119 



109 



200 



109 



Lampert 



Kokotoni . . . 



124—140 



110—115 



120—140 



60—90 



Britten 



Misaki 



130 



122 



170 



94 



Clark 



Funafuti .... 



157 



114 



157 



86 



Heding {ooplax) . . 



Samalona . . . 



145—165 



110 135 



150—190 



30—80 



{lœvis) . . . 



Saparoea .... 



140—155 



90—120 



125—155 



30—70 



Besides the measurements in the table Ohshima writes in 

 1914 (The Synaptidae of Japan): "In all the specimens before me, 

 the anchors measure 115 — 195 ft and the anchor-plates 57 — 135 /// 

 in length". As all the measurements but v. M a r e n z e 1 1 e r's agree 

 so well, we may suggest that these latter are erroneous. As regards 

 the biology of this species, cf. Note, p. 322. 



Patinapta laevis (Bedford). 



Synapta ooplax var. laevis. Bedford. 1899. Holothurians in "Willey's 



Zoological Results", p. 141. Pl. XVII fig. 3a— c. 



Synapta ooplax. Britten. 1906. Holothurien aus dem Japanischen und 

 Ochotskischen Meere, pag. 150. 



Leptosynapta ooplax. Clark. 1908. The Apodous Holothurians. pag. 90. 



Clark. 1924. The Synaptinae. p.489. PI. 7 f. 20— 24. 



Saparoea Bay. 11. III. 1922. The shore by low water mark. 14 specimens. 



The specimens at hand measure up to 16 cm in length. The 

 colour is pure white and the skin is so thin that the coral sand 

 in the intestine as well as some small parasitic bivalves which are 

 found in the oesophagus of some of the specimens may be seen 

 through it. There are twelve tentacles each with 4 — 5 pairs of 

 digits and 6 — 12 sensory cups. Eye-spots are wanting. The cal- 

 careous ring is rather stout (Fig. 41. 1) and the radiais are per- 

 forated for the nerves. A cartilaginous ring is wanting. The ali- 

 mentary canal is straight and the oesophagus is not distinctly dif- 

 ferent from the intestine. The bivalves found in the oesophagus 

 are rather like Entovalva mirabilis Voeltzkow, but at any rate 



Vidensk. Medd. fra Dansk naturh. Foren Bd. 85. 16 



