REPORT ON THE HOLOTHURIOIDEA. 
18 
from which it is distinguished only by the lack of any x -shaped miliary granules, and by 
the anchors which are of equal size. 
Synapta insolens, n. sp. (PI. I. fig. 3). 
Tentacles twelve, each with four digitations. Polian vesicles five, two of which are 
comparatively small. Madreporic canal single. Cartilaginous ring absent. The anchors 
(PI. I. fig. 3, a) about 0‘64 mm. long, asymmetrical or of almost symmetrical form, with 
twelve to eighteen serrations on each fluke. The posterior margin of the handle rough, 
with minute serrations. The plates (PI. I. fig. 3, h), about 0'56 mm. long, and of about 
the same breadth, are pierced by numerous circular holes, which diminish in size from the 
centre to the circumference ; numerous small spines are visible round the margin of the 
holes. The margin of the anterior half of the plates is free from any roughness, and 
evenly rounded, almost semicircular, while the margin of the remaining narrower part of 
the plates is, so far as I know, never completed. Miliary granules (PI. I. fig. 3, c) are 
present onl}^ as rounded or oval bodies. The surface of the transparent body-wall is 
rough from the anchors. Colour in alcohol, yellowish-white. Length about 110 mm. 
Habitat. — Station 188, September 10, 1874 ; lat. 9° 59' S., long. 139° 42' E.; depth, 
28 fathoms ; green mud ; a single individual. 
Synapta insolens must be nearly related to Synap>ta hankensis of Ludwig, from which, 
however, it differs by the want of the small anchors and plates as well as by a consider- 
ably fewer number of holes in the plates, &c. 
Synapta aculeata, n. sp. (PI. I. fig. 2). 
The integument is very rough from the comparatively large anchors. The anchors 
(PL I. fig. 2, a, h, c, d) vary greatly in shape ; scarcely one exactly resembles another. 
Those with flukes at eacli end of the shank are very rare. The flukes always carry six to 
eight serrations. The handle bears on its posterior margin some spinous processes. 
Length of the anchors about IT mm. The plates (PL I. fig. 2, e) are concave on their 
upper surface, so that the margin of their sides becomes directed upwards or rather 
outwards. The margin of the plates is never completed, but uneven with processes. 
The holes in the plates are comparatively small, and the anterior ones are commonly 
larger than those in the centre ; their margin is smooth. Length of the plates about 
0'74 mm. The miliary granules (PL I. fig. 2,y), of an oval form, seem exclusively to 
belong to the ambulacra, where they are disposed in double rows. Colour in alcohol, 
light brownish or dirty white. The surface of the integument with numerous small 
scattered papillae of a dark reddish colour. Length of the fragment I have had at my 
disposal about 65 mm. 
