1G6 SVEN LOVEN, ON THE ECHINOIBEA DESCRIBED BY LINN^EUS. 



Scillae, Barrowcr, lanceolate, sub-linear, not obtuse, but tliero 

 is also a oTcat dissimilaritv in the characters of the sternum, 

 Avhich, in eithcr of them, as in the Biissus carinatus Lamck., 

 and particularly in the Br. columbaris, is very broad, in a 

 relation of 72 to 100 to the entire breadth of the body, bnt 

 slicrhtlv convex, not keeled, nearly without distinet eminences, 

 whereas in the >'Unicolor> it is narrow, as 30 to 100, and 

 keeled, and shows very distinctly the prominent centres of 

 tubercnlar radiation. The sub-anal fasciola, decidedly reni- 

 form in the Brissus columbaris and the Br. Scillae, and deeply 

 bent in under the periproct, is cordiform in the Br. nnicolor of 

 Klein, arcuated under the periproct, and sends off, on each 

 side, an ascending branch reaching as high as to its dorsal 

 raaroin, as exhibited even in the fiwiire B of Klein, a cha- 

 racter adopted as distinctive for the genus Metalia. Conse- 

 quently it becomes an impossibility to unite into one species 

 the Brissus unicolor of Klein, the Brissus columbaris IjAMCK., 

 and the B. Scillae Ag. 



Lamarck described a Spatangus compressus from the Mau- 

 ritius, and from that island, as well as from Zanzibar, there 

 comes a form that answers well to his description, and was, 

 happily, recognised by v. Mårtens*). It is a true Brissus, 

 and not at all like the Metalia maculosa. It is elliptic, the 

 petals are broader than in specimens of a corresponding size 

 of the Br. carinatus, Scillae, or columbaris; the II and \\ are 

 directed very slightly backward and have their points a littlc 

 bent foward; 1 and V diverge a little and are very faintly 

 sigmoidal; their length is to that of II and IV, as 100: 72. 

 The sternum is broad, the subanal area reniform, with five 

 pedicellar pores on the left and four on the right. The peri- 

 petalous fasciola has two re-entering angles on the interradia 

 2 and o. It is evident that this species cannot by any means 

 be identiiied with the Metalia Spatagus L. 



') Arch. f. Natiirg., XXXII, 1866, I, p. 183. 



