110 Rev. A. M. Norman on the Genera and 



1841. Ophiocoma Goodsiri, Forbes, Brit. Starfishes, p. 57. 



1842. Ophiolepis Ballii and Goodsiri, Miiller & Trosehel, Syst. der As- 



teriden, p. 9/. 

 1848. Ophiopholis Ballii and Goodsiri, Gray, Brit. Mus. Cat. Brit. Radiata, 



p. 25. 

 1857. Amphiura Ballii, Sars, Middlehavets Littoral Fauna, p. 99. 

 1859. Ophiactis Ballii, Liitken, Addit. ad hist. Ophiuridarum, Anden 



Af deling, p. 126. 

 1861. Amphiura Ballii, Sars, Oversigt af Norges Echinodermer, pp. 17 



&20. 



Disk lobedj covered with small imbricated scales, frequently 

 produced at their apices into short spines, which are more 

 numerous and longer towards the margin and on the under 

 side of the disk ; radiating scales triangular, diverging, their 

 length equal to one-third the breadth of the disk. Arms of 

 moderate length, their upper plates obtusely triangular, with 

 the basal angle rounded ; lower plates somewhat heart-shaped, 

 with the basal angle rounded ; spines 4-5, red, the two upper 

 about equal to the breadth of the arm in length. Colour of 

 disk yellowish or red, often mottled with these two colours ; 

 arms banded with red. 



I have at length been able to determine positively what I had 

 long supected, that the two Starfishes described by Forbes 

 under the names O. Ballii and O. Goodsiri are one and the 

 same species. Through the kindness of Dr. E. Percival Wright, 

 I have had the opportunity of examining the fragments which 

 are preserved in the Dublin Museum of the types of Thompson's 

 O. Ballii ; while O. Goodsiri I have been enabled to satisfactorily 

 identify through specimens which were named by Prof. Forbes, 

 and which are preserved in the collection of Mr. Alder. I am 

 unable to discover any structural dijfference between the two so- 

 called species. 



Amphiura Ballii inhabits the Scandinavian and British Seas. 

 In the latter it has been taken at Shetland and off the coasts of 

 Durham and Northumberland (Norman) ; Moray Firth (Mr. T. 

 Edward) ; Dublin (Dr. Ball). It lives on hard ground, in deep 

 water, and has a peculiar habit, delighting to nestle in hollows 

 and crevices of stones, squeezing its disk and twisting its arms 

 so as to conform to all the irregularities of the surface to which 

 it attaches itself. 



Genus VI. Ophiopeltis, Diiben & Koren, 1846. 



Disk membranous, and altogether naked, wholly devoid of 

 scales and spines, except that there are two elongated plates 

 over the origin of each arm. Arms simple, scaly, without 

 any soft integument ; lateral scales bearing spreading spines^ 



