ASTPROIDEA. 
a, Off Island of North Rona. a 
(St. 7). 
b-d. Lamlash Bay. Prof. Herdman. 
e,f. Arran. Dr. Leach. 
g,r. Between Arran and Ailsa Craig, 28 fms. John Murray, Esq. 
. Kilbrennan Sound, 10-20 fms. 
. 4miles 8.E. of Sanda Island, 30-35 fms. 
. Scotland, 
*, Off West coast of Ireland, 538° 15' N., 
11°51' W., 106 fms. 
John Murray, Esq. 
John Murray, Esq. 
‘ Porcupine’ Exp. 
(St. 8). 
s. Off Valentia. ‘Lightning’ Exp. 
t. Killybeg Harbour, 14-16 fms. R. Dublin Soc. 
u. Davalaun, 30 fms. R. Dublin Soc. 
v. Off Ballycottin. R. Trish Acad. 
w. Youghal. Belfast Nat. Hist. Soc. 
x-z. Off Liverpool. 
a’. Tenby. 
6’. Falmouth. Dr. P. Cocks. 
. Plymouth. 
Ross-shire. 
f’. British Seas. 
Dr. Sutherland. 
2. RHEGASTER *. 
Rhegaster, Sladen, Trans. Roy. Soc. Ed. xxxii. (1883) p. 155; zd. 
Chall. Rep. Ast. (1889) p. 367. 
A Gymnasterid in which the marginal plates carry spines, but in 
which there is no row of spines along the middle line of each ray. 
The plates of the dorsal surface are closely covered with fine spines, 
but there is no marginal fringe. 
1. Rhegaster murrayi. 
Rhegaster murrayi, Sladen, Trans. R. Soc. Ed. xxxii. (1888) p. 156, 
pl. xxvi. figs. 2-7 ; id. Chall. Rep. Ast. (1889) p. 368. 
R => 1S tT. 
According to Mr. Sladen this species, of which only a single 
specimen is known, is nearly allied to &. tumidus, Stuxberg, but 
differs in the shorter ray, the ‘‘ marginal contour is distinctly 
festooned by the inferomarginal plates, and each of these bears a 
group of enlarged spinelets ;” the spinelets are said to be more simple 
in character than in &. tumidus, and the papule more numerous on 
the lower surface. 
a. Faeroe Channel, 285-433 fms. ‘Triton’ Exp. 
* This genus, as well as ‘‘Marginaster ” and Lasiaster, have been established 
on quite immature specimens, a circumstance which probably will give rise to 
much misconception in the future. 
