OPHIURA. 109 
a, 6. Firth of Lorn. John Murray, Esq. 
ec, d. West coast of Scotland. John Murray, Esq. 
e. 34 miles off Achill Head, 175 fms. R. Irish Acad. 
fj. Donegal Bay, 30 fms. R. Irish Acad. 
k, l. Blacksod Bay. R. Trish Acad. 
m-p. Valentia. ‘ Lightning’ Exp. 
q-s. Off Liverpool. 
t,u. Plymouth. 
3. Ophiura sarsi. 
Ophiura sarsii, Luth. Vid. Medd. 1854 (1855), p. 101; ad. Dansk. 
Vid. Selsk. Skrift. v. (1859) p. 42, pl. i. figs. 3&4; Norm. Ann. § 
Mag. xv. (1865) p. 118; Jarzynsky, Trans. Petersb, Soc. Nat. i. 
(1870) p. 318. 
Ophioglypha sarsi, Lyman, Ill. Cat. M. C. Z. i. (1865) p. 41, 
figs. 2&3; Marenz. Denk. Ak. Wien, xxxy. (1878) p. 882; Dune. 
§ Slad. Echin. Greenl, (1881) p. 60, pl. iv. figs. 3 & 4; Lyman, Chall. 
Rep. Oph. (1882) p. 40; Hoyle, Proc. Roy. Soe. Ed, xii. (1884) 
p- 720; ed. Proce. Phys. Soc. Ed. viii. (1885) p. 150; Ludw. Zool. 
Jahrb. i. (1886) p. 282; Lelstrup, Zool. Dan. Pigh. (1890) p. 28, 
1. ii. fig. 2. 
Gybiarn coriacea, Liitk. Vid. Medd, 1854 (1855), p. 201. 
A rather large species, not unlike O. ciliaris, but distinguished 
from it by its smaller mouth-shields, less numerous spines in arm- 
combs, the absence of ventral pores, stouter lateral plates, and 
longer arm-spines. Covering-scales of disk imbricated. Radial 
shields much wider without, where they nearly touch, than within. 
Four teeth; mouth-papille six or seven on either side. Mouth- 
plate shield-shaped, a little longer than broad. Bursal slits not 
very long, with a fringe of papilla along the outer edge. Arm- 
notch in disk wide, with a comb of less than twenty spines. Arms 
carinate at base, and flattened more distally. ‘The lateral plates, 
which are much thickened, meet below in a wide suture; the 
ventral plates form short triangles with straight distal edge ; the 
arm-plates show a tendency to break up into smaller pieces, but the 
character is by no means so marked as in Ophioplocus imbricatus. 
Colour in spirit milky white, or marked with light brown. 
R is frequently equal to 67; r frequently =10 mm. 
Distribution. Both sides of North Atlantic ; Arctic Ocean. To 
345 fms. 
a-c, Faeroe Channel, 345 fms. ‘ Porcupine’ Exp. (St. 65). 
d,e. Faeroe Channel, 290 fms. ‘ Porcupine’ Exp. (St. 78). 
f-t. Faeroe Channel, 312 fms. ‘Porcupine’ Exp. (St. 82). 
4. Ophiura robusta. 
Ophiolepis robusta, Ayres, Proc. Bost. Soc. N. H. iv. (1851) p. 134. 
Ophiura squamosa, Lith. Vid. Medd. 1854, p. 100; id. op. cit, 1857, 
p. 50; td. Danske Vid. Selsk, Skrift. v. (1859) p. 46, pl. i. fig. 7; 
Norm, Ann. & Mag. xv. (1865) p. 114. 
Ophiura fasciculata, Forbes, Sutherl. Voy. (1852) ii. p. cexiv. 
Ophioglypha robusta, Lyman, Ill. Cat. M. C. Z. i. (1865) p- 45; 
Marenz. Denk. Ak. Wien, xxxy. (1878) p. 382; Dune. & Slad. 
Echin. Greent. (1881) p. 62, pl. iv. tigs. 5-7; Lyman, Chall. Rep. 
