the Echinodermata of the Arctic Expedition. 465 



upper arm-spine of the sixth joint was 1*85 millim. (in one 

 case 2"3 millims. !) ; in another, with a diameter of disk of 

 8*5 millims., the same spine was 1'8 millim. long, three arm- 

 joints in this individual being exactly 2 millims. In addition 

 to the above, variations occur in the contour of the mouth- 

 shields, and in the larger examples considerable irregularity is 

 also found in the number and position of the mouth-papillae. 

 Amongst this collection are several specimens having a very 

 decidedly pentagonal form of disk. 



In our opinion, none of the above variations can be regarded 

 as of greater morphological significance than growth-phases, 

 or at most individual variations only. The largest specimen 

 obtained was 11 millims. in disk- diameter, 



Ophiopholis hellis (Linck), Lyman. 



Scolopendroides hellis {scolopendricd), Linck, De Stell. Marinis, p. 52. 

 Asterias aculeata, Miiller, Zool. Dan. Pr. 2841 ; Zool. Dan. iii. p. 29, 



t. 99. 

 Ophiura bellis, Johnston, Mag. Xat. Hist. vol. viii. p. 595. 

 Ophiolepis scolopendrica, Miiller & Troschel, Syst. d. Ast. p. 96. 

 Ophiocoma bellis, Forbes, Mem. Werner. Soe. vol. \'iii. p. 126 ; Ilist. 



Biit. Starfishes, p. 53. , 

 Ophiapkolis aculeata, Liitkeu, Add. ad Hist. Oph. p. 60. 

 O. bellis, LjTnan, 111. Cat. M. C. Zool. Harvard, i. p. 96. 



Coll. Feilden : lat. 65° N., 26 miles from Greenland coast, 

 30 fms. 



Aniphiura Holbolli, Liitken*. 



? Ophiolepis Sundevalli, Miiller & Troschel (non Job. Miiller), Syst. d. 



Asteriden, p. 93. 

 Ampldura Holbolli, Liitken, Vid. Meddelelser, Nov. 1854, et Add. ad 



Hist. Ophiuridarum, p. 55 ; Lyman, 111. Cat. Mus. Comp. Zool. i. 



p. 118. 

 A. Sundevalli, Ljungman, Oph. Viventia, (Efv. K. Vet.-Akad. Fcirh. 



1866, p. 320. 



Coll. Feilden : Franklin-Pierce Bay, 15 fms., bottom-tem- 

 perature 29°'5 F. 



An Amphiura with disk lobed ; radial shields long and 

 narrow ; mouth-shields rounded ; side mouth-shields large, 

 subtriangular, with the sides reentering and angles rounded. 

 Three pairs of mouth-papillse, the middle ones placed higher 

 than the others. Under arm-plates pentagonal. One tentacle- 

 scale rounded ; arm-spines 3-4. 



Only a single specimen of Amphtura was taken ; and this, 



* So much confusion has arisen in consequence of uncertainty as to the 

 identity of the original application of the appellation O. Sundevalli, that 

 we prefer to retain Dr. Liitkon's name, despite the example of certain 

 recent writers to the contrary. 



Ann. ct Maff. X. Hist. Ser. 4. Vol. xx. 32 



