.562 '• THETIS " SCIENTIFIC RESULTS. 



oral disc, 5 mm.; number of tentacles, 15 ; tentacle a little over 

 a millimeter long, with a minute digit on each side, close to the 

 blunt, I'ounded tip. No evident genital papilla. Calcareous 

 ring moderately stout; radial projections rather wide, not deeply 

 .notched. Polian vessel, stone-canal and respiratory trees could 

 not be discovered in the mud with which the body-cavity was 

 largely filled. Calcareous deposits in body-wall abundant, making 

 the surface very rough to the touch ; these deposits are well- 

 formed tables with a high, rough, more or less pointed spire ; 

 small ones (PI. Iviii, figs. 12, 13) have the disc more or less 

 triangular, perforated by about six holes, the spire made up of 

 three rods with three or four cross-bars ; larger tables (PI. Iviii, 

 figs. 14-16) have the disc more or less round, with ten or twelve 

 holes, the spire with six-eight cross-bars ; height of spire com- 

 Jiionly greater than diameter of disc, which may be as much 

 as •2 mm; in caudal appendage, tables (Pi. iviii, figs. 17-21) 

 .smaller, with numerous (20-40) minute holes in disc, and a low 

 squarish spire, with one or no cross-bar, and coarse teeth at 

 the top. Many tables in the body are in process of transforma- 

 tion into phosphatic deposits ; the latter are comparatively few 

 in the small specimen, but are exceedingly numerous in the 

 type, forming patches often a millimeter across. Oral disc and 

 caudal appendage very light grey; in the small specimen the 

 tentacles are yellowish, the body light yellowish-grey, with 

 scattered spots of yellowish-red ; in the type the phosphatic 

 bodies are so numerous, the general colour is brick-red, finely 

 speckled with grey. 



Three specimens from Station 46. Off Jibbon, 50-66 fathoms ; 

 -mud and abattoir refuse. 



The affinities of this interesting Holothurian will be discussed 

 in connection with the following species. 



MOLPADIA PHODUCTAMENSIS,** sp.nov. 



(Plate Iviii, figs. 22-30.) 



Body quite stout, 68 mm. long by 35 in diameter ; oral disc, 

 5 mm. in diameter ; caudal appendage, 6 mm. long. Tentacles so 

 ■ contracted neither their number nor the position and number of 

 the digits could be determined. No evident genital papilla. 



^^productus=dva,wn oat + mensis (ablative plural of mensa, table)=with 

 tables, in reference to the drawn out ends of the table in the caudal 

 .appendage. 



