302 MR. H. N. MOSELEY ON DEEP-SEA ACTINIARIA 



corresponding in position to the intervals between the attachments of the mesenteries. 

 The base is hollowed out into a cavity (fig. 10), which cavity had probably been occupied, 

 as in C. profundus, by some object to which the animal had been attached. The cavity 

 is surrounded laterally by a thin but firm wall, formed of the obliquely projecting wall 

 of the body, the margins of the cavity being thus somewhat undercut, so as to afford 

 increased holding power. The bottom of the cavity, or actual base, is smooth and 

 imperforate. The oral disk is elevated and rounded towards the centre. The tentacles 

 are 72 in number : of these, 12 larger or primary are disposed at equal intervals along 

 the margin of the disk, with 12 secondary and 24 still smaller tertiary ones placed 

 symmetrically between them. On the surface of the disk itself, at about half the distance 

 between the margin of the mouth and that of the disk, is a circle of 12 tentacles, placed 

 opposite the primaries, and intermediate in size between these latter and the secondaries. 

 Halfway, again, between the line of origin of this inner circle of tentacles and the disk 

 margin is a further circle of 12 smaller tentacles, placed opposite the secondaries. The 

 tentacles are elongate-conical in form, tipped by very distinct knobs. The bases of the 

 tentacles are very firm and cartilaginous. The general colour of the animal is a very 

 pale pinkish yellow. The disk has a dark madder colouring * in parts, and rings of the 

 same colouring girdled the tentacles just beneath their knobs. The single specimen 

 obtained was much rubbed, and hence the exact distribution of the pigment was 

 uncertain. 



The specimen was dredged between the Banda group and Amboyna, in lat. 6° 21' S., 

 long. 129° T E., from 1425 fathoms, on Oct. 3rd, 1874. 



Family CERIANTHIDvE. 



Cerianthtjs bathymetrictjs, sp. nov. (Plate XLV. figs. 15-20.) 



This species is contained within a tube formed of the felted threads of its large 

 nematocysts, as is the case with the other species of the genus. The tube is 11 centims. 

 long, and about 1^ centim. broad in the broadest part. It is represented of the natural 

 size in the figure (fig. 15). The opening at the upper extremity is in the form of a longi- 

 tudinal slit. The tube is beset with foraminiferous shells. Embedded in its substance 

 were found spicules of a Hesactinellid sponge, and also amongst its fibres were nume- 

 rous small nematoid worms (fig. 20). The animal contained within the tube is about 

 2J centims. long. There is an opening at the apex of the conical posterior extremity of 

 the body as in other species of the genus. The tentacles are disposed in two series. Those 

 of the outer series are 5 millims. in length, and are, in the one perfect specimen available 

 for examination, 28 in number. Those of the inner series are about 1 millim. in length 

 and 14 in number. The upper part of the digestive cavity corresponds exactly to that 

 figured in Bronn's ' Klassen und Ordnungen des Theirreichs,' 2te Bd. Taf. vii. fig. 4, 

 after Haime, from Geriantlms membranaceus, and termed " Magensack;" but the digestive 



* The madder colouring on both species of Corallimorphus here described was due to the substance I have termed 

 polyperythrin (Quart. Journ. Micros. (Science, I. c). 



