EEPORT OX THE HOLOTHURIOIDEA. 
129 
which, however, in old specimens are not unfrequently abraded in places. Near 
the mouth and anus the scales are smaller and grouped around the openings, 
where a niunber of them are transformed into wart-like tubercles. The scales 
bordering the margin of the dorsal surface much smaller. The sole with 
reticulate cups or spheres. 
Eahitat . — Arctic Ocean, north from Norway (Danielssen and Koren, Hoffmann), north 
from Nova Zembla (v. iMarenzeller), Greenland (Diiben and Koren, Liitken, 
Norman, Duncan and Sladen, Ludwig), Newfoundland (Liitken), Grand Manan 
(Stimpson, Ludwig, Terrill), New England (Ayres), Massachusetts (Lutken, Bell, 
Gould, Terrill), Massachusetts Bay to Greenland (Terrill), Sitka (Brandt), Japanese 
Sea (Bell), (?) Kurde Islands (PaUas), (?) St. Paul in Bhering Sea (Middendorff). 
(Mus. Holm.) Numerous specimens from different locahties of the Arctic Sea. 
Psoliis sqiiamatiis {Cuvieria), Diiben and Koren, 1844; Koren, 1844; Sars, 1861; 
Bell, 1882. (?) Holothuria sqiiamata, 0. F. Miiller, 1788. Lophothuria 
squamata, Terrill, 1873. 
Body depressed, like that of the preceding species. Lateral series of pedicels 
composed of two to four rows. Odd ambulacrum always naked, though it 
possesses some pedicels in its anterior and posterior portions. Scales large, 
imbricating upon one another, with rather uneven margin, and covered with fine 
granules only. The sole, devoid of the cup-shaped bodies, is supported by more 
or less scattered, frregular, reticulate slightly spinous or knobbed plates. 
Halntat . — West coast of Scandinavia from Bergen to Lofoten and Einmark (Sars 
Diiben and Koren, Danielssen and Koren, Mobius and Biitschli, Barrett and 
M'Andrew), British Islands (Norman, Hodge), Gulf of St. Lawrence (Bell), coast 
of New England (Terrill). 
The characters distinguishing the three last species appear to be very unimportant, 
and there may be a question whether they are distinct or not. However, 
Psolus hoholemis has an Hscirfia-shaped body, while the other two have it 
depressed, and the anal portion not prolonged into a conical tail. None of them 
have the large oral valves, peculiar to several of the following species. 
Psolus peronii (subgenu.s Lophothuria), Bell, 1882. 
Halitat . — (?) 
Judging from the description of Bell, the general appearance of this species must be 
very like that of Psolus squamatus, and it is distinguished mainly by “ a very 
large number of scales, only slightly imbricated near the margin,” and by the 
possession of cup-shaped deposits in the ventral sole. 
Psolus ephippifer, Wyville Thomson, 1877 and 1878. 
Halitat . — Heard I.slands (W. Thomson). 
Tills Antarctic species is easily known from the Arctic forms, Psolus fdbricii and 
(ZOOL. CHALL. EXP. PART XXXIX. — 1886.) Qj 
