Natural History of East Finmark. 412 



1882. Trochostoma Thomsonii, Danielssen & Koren, Norwegian North- 

 Atlantic Exped., Holotliuroidea, p. 42, pis. vii., viii., ix. figs. 38-41, 

 pi. xiii. fig. 4, and var. maculatum, p. 94, pi. xiii. figs. 5, 6. 



1882. Trochostoma boreale, iid. ibid. p. 64, pi. x. figs. 7-11. 



1882. Trucliosfomn arcticwii, iid. ibid. p. G5, pi. ix. figs. 1-5, pi. x. 

 fig. 6, pi. xiii. fig. 3. 



Ludvig, in ' Fauna Arctica/ vol. i. Holothuroidea, p. 161, 

 unites all the forms described by Danielssen and Koren 

 under the Molpadia borealis, M. Sars. 



The form called Trochostoma arcticum by Danielssen and 

 Koren was dredged by the ' Voringen ' in the Porsanger 

 Fiord in 127 fathoms (Stat. 260), and in the same depths in 

 the Tana Fiord (Stat. 261). 



Genus Ankyroderma, Danielssen & Koren. 



Anhyroderma Jeffreysii, Danielssen & Koren. 



1879. Anhyrodenna Jeffreysii, Danielssen & Koren, " Fra den Norske 

 Nordbavsexpedition Echiuodermer, III.," Njt Mag. for Naturvid. 

 vol. XXV. p. 128, pis. V. & vi. figs. 11-19, 21. 



1879. Ankyrodenna affine, iid. ibid. p. 133, pis. v. & vi. figs. 22-28. 



1882. Ankyroderma Jeffreysii, Dan. it Kor. Norw. N.-Atlant. Exped., 

 Holotburoidea, p. 07, pis. x., xi., xii. figs. 12-28. 



1882. Ankyroderma affine, iid. ibid. p. 71, pi. xii. tigs. 29-36. 



Ludvig (/. c.) has united the two forms to which the 

 describers had assigned specific rank. 



This most interesting new form discovered by the ' Vo- 

 ringen^ was dredged at Stations 260, 261, 26.2, at the 

 Porsanger and Tana Fiords, and also off Vardo in 127-148 

 fathoms. It possesses anchors like those of a Synapta, but 

 instead of resting for support upon a single calcareous plate, 

 as in that genus, they are attached at the central junction of 

 the " heads '■" of five or six " battledore ^'-shaped spicules, the 

 long " handles " of which spicules radiate from the centre. 

 Other spicules not unlike those of a Thyonidium are pro- 

 fusely scattered throughout the epidermis. 



The Ankyroderma musculus (Kisso) from the Mediter- 

 ranean comes very near to this species (vide Ludvig, Zeits. 

 f. wiss. Zool. vol. li. p. 571, pi. xxix.). 



Genus Eupyrgus, Lutken. 



Eupyrgus scaher, Lutken. (PI. XXVII. figs. 1-3.) 



1857. Eupyryus scaber, Llitken, Oversigt over Griinlauds Eclun(j- 



deruiata, p. 22. 

 ? 1857. Eiqyyryus scaber, Barrett, " Description of Four new Species of 



