126 



OPHITTROIDEA. 



spines at the sides and below ; the granules are pretty thick on the 

 outer side of each radial shield. As many as twelve teeth in a row ; 

 three mouth-papillse on either side. Mouth-plate irregularly lenti- 

 cular, wider than long ; side mouth-plates of moderate size. The 

 spines of interbrachial area below confined to the middle, so that 

 the edges of the bursal slits are free of them. Form of disk and 

 depth of arm-notch very variable. Arms wide, flat. Seven short, 

 very stout arm-spines, the two lowest the most delicate. The small 

 plates surrounding the distal and outer edges of the upper arm- 

 plates disappear towards the tip of the arm, becoming gradually 

 smaller as the neighbourhood of the disk is left. Lower arm-plates 

 irregularly quadrate, separated by notches, the single tentacle-scale 

 very distinct. 



This species presents great variations in form, colour, and extent 

 of spinulation ; the ordinary colour is a hue of purplish red, deeper 

 in parts, mottled or spotted, and it is much better retained in dried 

 specimens than is the case with most Ophiurids. 



R=78 

 r= 9 



77 (about) ; 

 11; 10; 6. 



68; 41. 



Distribution. Both sides of North Atlantic, as far south as Cape 

 Cod on the west and Great Britain on the east. 0-300 fms. 



a-c. Faeroe Channel, 345 fms. 

 d. Faeroe Channel, 114 fms. 

 e-n. Faeroe Channel, 312 fms. 

 o. Faeroe Channel, 560 fins. 

 p. East of Shetland, 64 fms. 

 q. East of Shetland, 75 fms. 

 r. East of Shetland, 203 fms. 

 s-v. East of Shetland, 290 fms. 

 w, x. Upper Loch Torridon, 30-40 fms. 

 y, z. Between Plocton and Loch Re- 

 raig, 8-24 fms. 21/9/91. 

 a'. Mouth of Sound of Mull. 68 fms. 

 b'-d'. Firth of Lorn, 50 fms. 

 e'-i'. Loch Etive, 15-20 fms. 

 j'-l'. West Scotland. 

 m'-o'. West Ireland. 

 P, q'. 50° 24' 45" N., 10° 07' 30" W., 

 200 fms. 

 r . Courtmasherry. 

 s', t'. Isle of Man. 

 u J ', v'. Off Liverpool. 

 w'-b". Montrose, June 24, July 3, 4, 6, 



10, and Aug. 3, 1889. 

 c"-i". Montrose, 3/9/89. 



J". Aberdeen. 

 &", I". Shetland. 

 n". Orkney. 



' Porcupine ' Exp. (St. 65). 

 'Porcupine' Exp. (St. 61). 

 ' Porcupine ' Exp. (St. 82). 

 ' Porcupine ' Exp. (St. 77). 

 ' Porcupine ' Exp. (St. 67). 

 < Porcupine ' Exp. (St. 68). 

 ' Porcupine ' Exp. (St. 74). 

 'Porcupine 'Exp. (St. 78). 

 John Murray, Esq. 

 John Murray, Esq. 



John Murray, Esq. 

 John Murray, Esq. 

 John Murray, Esq. 

 John Murray, Esq. 

 ' Porcupine ' Exp. (St. 17). 

 G. C. Bourne, Esq. 



Belfast Nat. Hist. Soc. 

 Prof. E. Forbes. 



W. Duncan, Esq. 



W. Duncan, Esq. 

 G. Sim, Esq. 



m 



