REPOET ON THE HOLOTHIJRIOIDEA. 
39 
Suborder II. PXEUMOXOPHOPiA. 
Eespiratoiy-trees present. Eadial ambulacral vessels present or not. 
Family, Molpadid.®:. 
Genus Ankyroderma, Danielssen and Koren, 1879 and 1882. 
Anhyroderma danielsseni, n. sp. (PI. II. fig. 6). 
Body fusiform, anteriorly truncated, posteriorly diminisliing into a narrow caudal 
portion. Tentacles fifteen (?), retracted, very short, each with a pair of minute processes 
near the rounded end. Anal processes or teeth absent. Calcareous ring almost 
resembling that in Trochostoma violaceum. Polian vesicle single. Madreporic canal 
single, terminating within a tubercle, attached to the body-wall in the medio-dorsal line. 
Fifteen long slender tentacular vesicles. The longitudinal muscular bands double, and 
witliout retractors. Eespiratory-trees two, the left considerably longer than the right 
one, and anteriorly reaching the gullet and calcareous ring and attached to them. The two 
fascicles of the reproductive organs very thin, and consisting of a few elongate slightly 
branched sacs. Integument thin and rough, with several kinds of deposits — numerous 
smaller and larger, rounded or oval bodies of a reddish-brown colour, aggregated into 
closely lying groups ; numerous long fusiform straight or slightly curved rods with the 
centre slightly enlarged and perforated, but without any central process ; smaller, more 
scattered, irregular perforated plates with two or more shorter arms, and with a long 
central process directed straight outwards from the body ; and spoon-like rods, with one 
end enlarged and perforated, collected into groups of six to seven in each, and overlapping 
one another with the enlarged ends, each group presenting thus the aspect of a star. 
From the centre of these stars, wEich are v^ery scattered, a long central anchor-shaped rod 
rises, directed straight outw’ards and supported by a round perforated disk-like base. 
Length of the individual about 75 mm. Colour in alcohol greyish- violet with 
numerous reddish-brown spots ; the foremost and hindmost portions of the body 
whitish-grey. 
Habitat. — Station 310, January 10, 1876 ; lat. 51° 27^ 30" S., long. 74° 3'W.; depth, 
400 fathoms ; bottom temperature, 46 '5 ; blue mud ; a single individual. 
This species, doubtless very nearly related to the three previously known forms 
of the same genus, viz., Anhyroderma jeffveysii and Anhyroderma affine, Danielssen and 
Koren, and Anhyroderma roretzii, v. Marenzeller, differs from them particularly in the 
possession of the numerous v^ery long smooth fusiform bodies as w'ell as in the siiape of 
the central anchor-rod of the star-like deposits, which is supj)orted by a disk-like per- 
forated base. 
