OPHIURA. 109 



a, b. Firth of Lorn. John Murray, Esq. 



c, d. West coast of Scotland. John Murray, Esq. 



e. 34 miles off Achill Head, 175 fms. R. Irish Acad. 



f-j. Donegal Bay, 30 fms. R- Irish Acad. 



k, I. Blacksod Bay. R- Irish Acad. 



m-p. Yalentia. ' Lightning ' Exp. 



q-s. Off Liverpool. 



t, u. Plymouth. 



3. Ophiura sarsi. 



Ophiura sarsii, Liitk. Vid. Medd. 1854 (1855), p. 101 ; id. Dansk. 



Vid, Selsk. Skrift. v. (1859) p. 42, pi. i. figs. 3& 4 ; Norm. Ann. $ 



Mar/, xv. (1865) p. 113 ; Jarzynsky, Trans. Peter sb. Soc. Nat. i. 



(1870) p. 318. 

 Ophioglvpha sarsi, Lyman, III, Cat, M. C. Z. i. (1865) p. 41, 



figs. 2 & 3 ; Marenz. Denk. Ak. Wien, xxxv. (1878) p. 382 ; Dune. 



<§• Slad. Echin, Greenl. (1881) p. 60, pi. iv. figs. 3 & 4 ; Lyman, Chall. 



Rep. Oph. (1882) p. 40 ; Hoi/le, Proc. Roy. Soe. Ed. xii. (1884) 



p. 720 ; id. Proc. Phys. Soc. Ed, viii. (1885) p. 150 ; Ludiv. Zool. 



Jahrb. i. (1886) p. 282 ; Fjelstrup, Zool. Dan. Pigh, (1890) p. 23, 



pi. ii. fig. 2. 

 Ophiura coria,cea, Liitk. Vid. Medd. 1854 (1855), p. 201. 



A rather large species, not unlike 0. cillaris, 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-papillae six or seven on either side. Mouth- 

 plate shield-shaped, a little longer than broad. Bursal slits not 

 very long, with a fringe of papillae 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 Ophioi^locus imbricatus. 



Colour in spirit milky white, or marked with light brown. 



R is frequently equal to 6 r ; r frequently =10 mm. 



Distribution. Both sides of Xorth Atlantic ; Arctic Ocean. To 

 345 fms. 



a-c. Faeroe Channel, 315 fms. ' Porcupine ' Exp. (St. 65). 



d, e. Faeroe Channel, 290 fms. ' Porcupine ' Exp. (St. 78). 



f-i. Faeroe Channel, 312 fms. ' Porcupine ' Exp. (St. 82). 



4. Ophiura robusta. 



Ophiolepis robusta, Ay res, Proc. Bost. Soc. N. H. iv. (1851) p. 134. 

 Ophiura squamosa, Liitk. Vid. Medd, 1854, p. 100 ; id. op. cit. 1857 



p. 50; id, Danske Vid. Selsk. Skrift. v. (1859J p. 46, pi. i. fig. J • 



Norm. Ann. § Mag. xv. (1865) p. 114. 

 Ophiura fasciculata, Forbes, Satherl. Voy. (1852) ii. p. ccxiv. 

 Ophioglypha robusta, Lumqii, III. Cat. M. C. Z. i. (1865) p. 45 ; 



Marenz. Denk. Ak. Wien, xxxv. (1878) p. 382; Dime. $ Slad. 



Echin. Greenl. (1881) p. 62, pi. iv. figs. 5-7; Lyman, Chall. Rep. 



