106 



of some one of the other known species of Amblypneustes , as Studeu thinks pos- 

 sible (Op. cit. p. 874) is quite certain; it is, on the contrary, rather remote from all 

 the other species, and perhaps ought not to be retained in that genus. 



Amblypneustes vegce Loven (mentioned by Döderlein in his paper „Seeigel 

 von Japan und den Liu-Kiu-lnseln, p. 38, but not published by Loven himself) is 

 only Mespilia globulus; Prof. Théel has kindly sent me a specimen from the Stock- 

 holm-Museum. 



Holopneustes piirpiirascens Ltk. ^). The type specimen is a naked test, but 

 the spines and some pedicellariæ have been preserved. The spines (Fig. 10, PI. II. 

 Fig. 24) are distinctly clubshaped and red coloured. The ophicephalous pedicellariæ 

 (PI. VII. Fig. 32) have rather elongate valves, not narrowed in the middle. The 

 triphyllous pedicellariæ are like those of A. formosiis etc. Globiferous 

 pedicellariæ I have not been able to find among the remnants pre- 

 served of the type-specimen; but in the specimen from Port Philip men- 

 tioned above (p. 104) I find them to be like those of A. formosus. — 

 In his description of this species in „Rev. of Ech." p. 485 Agassiz 

 says: „actinal and abactinal diameter equal". If that means diameter 

 and height, the statement is correct (53—52 mm. in the type-specimen). 

 Further Agassiz says: „poriferous zone equal in width to the corre- 

 sponding tuberculiferous ambulacral space" — this is wrong; the pori- 

 ferous zone is not equal in width to the whole interporiferous area 

 (as is the case in H. porosissimus) , only a little more than half as wide 

 as the whole interporiferous zone (comp, measurements given below). 

 The outer row of pores is said to be „characterized by the greater size 

 of the inner pore, and the distance separating the pores of a pair". I 

 do not find this feature distinct in the type specimen, nor in the other 

 specimen examined. „In large specimens the middle row of pores is 

 very irregular" — in the type-specimen, which may well be said to be 

 a large specimen, the median row is almost quite regular. „The tubercles 

 of both areas form most regular horizontal rows". This does not suit 

 very well with the type-specimen. In the interambulacra there are at 

 the ambitus inside the primary tubercle about 5 tubercles, much smaller 

 than the primary one, forming a rather regular horizontal row in the middle of 

 the plate; some few small secondary tubercles are more or less regularly disposed 

 at the upper and lower edge of the plate. Outside the primary tubercle there are 

 more secondary tubercles, among which one is larger than the rest, but not quite 



Fig. 10. Pri- 

 mary spine 

 of Holopneu- 

 stes purpur- 

 ascens. (Oljj. 

 A'. ÜC. 3.) 



so large as the primary one; 



these larger tubercles form a rather regular vertical 



series besides that formed by the primary tubercles. In the ambulacra there is a 

 row of three tubercles, almost equally sized, in a few plates; these rows, however, 

 are not horizontal but markedly oblique, rising towards the median line of the area. 



') Not pitrpnresccns, as spelled in ,I!ev. of Eeli.'' 



