456 THE DEPTHS OF THE SEA. [CHAP. 1X. 
numerous, for species of Asteracanthion, Cribrella, 
Asteriscus, and Ophidiaster are as abundant as they 
are at lesser depths ; but as we go down new species 
with tesselated mailing on the disk and massive 
marginal plates seem to be perpetually added. In 
our own seas some few very characteristic forms, 
such as Astrogonium phrygianum and Archaster 
andromeda and parellii, are on the verge of the deep 
water, and are now and then taken at the outer 
limit of shore dredging or on fishing-lines ; while in 
the deep water all along the north and west of Scot- 
land Astrogonium granulare, Archaster tenuispinus; 
and Astropecten arcticus abound, and the dredge is 
enriched from time to time with examples of such 
forms as Archaster bifrons (Fig. 74), A. vexillifer, and 
Astrogonium longimanum, Mosrus. Many additions 
have been made to the singular little group of which 
Pteraster may be taken as a type, but I am inclined 
to think that these are to 
be referred along with most 
of the characteristic Ophiu- 
ridans rather to a fauna in- 
habiting median depths, and 
coming within range of the 
naturalist’s dredge on the 
coast of Scandinavia, than 
to the abyssal fauna; and 
ged Kones, Oral aspect, Natural size. the same may be said of a 
mest few other forms, such as 
Solaster furcifer (Fig. 75), and Pedicellaster typicus 
which, although beyond the 200-fathom line on the 
coast of Britain, do not appear to have a great 
range of depth. 
