BIHANG TILL K. sv. VET.-AKAD. HANUL. BAND 13. AFD. IV. N:0 5. 149 



their uppermost plates and near the peristome. In the other 

 specimen, of 92 mm. and 61 mm. and with 7, .5 — 8 tubercles, 

 the areola attains in breadth to 0,i8 of the interradinm and 

 presents up to nine granules in a row betwcen the scrobicu- 

 lar circle and the suture, while marginally the rings are very 

 near to the zones. Both specimens differ from the C. impe- 

 rialis Lamck., not only in these characters of the interradial 

 areola but also in the greater depth of the eqnally large scro- 

 bicnles, with higher cones and smaller mamelons. The am- 

 bulacral areola is much the same; there are between the mar- 

 oinal tubercles two dovible rows of granules, the sutural one 

 being alternating and disorderly. Cidaris parvispinis Tenyson- 

 WooDs') will be the name of this species. 



The specimen of the Cidaris imperialis Lamck., it seems 

 to me most likelv, had been added to the l)rottnine;holm 

 collection after tho short visit Lin:n^us made there in Sep- 

 tember 1754, when he drew up descriptions of two species of 

 Echinoids then lately acqnired. He could not have seen it 

 by tlie side of his E. Cidaris without perceiving its distinct- 

 ness. It may be presumed that it never came before his 

 eyes. The species which afterwards caused him to alter the 

 word »globoso» to »hemisphaerico», was, I suppose, the Cidaris 

 papillata Leske which always was comraon in collections. 

 The habitat, which in 1752 was the East-Indies, then, in 

 1758, became: the Ocean. That it was an inhabitant of a 

 neiffhbourino- sea w^as a fact Linn.eus was not aware of imtil 

 in November 1760 A. R. Martin brought him the specimens 

 lie introduced into the F. S. ed. 2, 1761, as Echinus Cidaris, 

 with the same incomplete diagnosis as in the S. N. ed. 10, 

 but rcferring solely, and rightly, to Gualtieiu, t 108, fig. i>, 

 E. The habitat then became: )in Oceano Norvegico;^. 



The two species which in the M. L. U. are the last among 

 the >Eegulares», as Nos 9 and 10, and a third species which in the 

 S. N. ed. 10 appears as No 11, beloug to the group of the 

 EchinometrsR, as indicated by the term: »ovalis». 



') Proc. Lin. Soc. N. S. W.. IV. p. 286. Pl. XIV, fig. J., B. — Ram- 

 SAY, Catalogue of the Echinodcrmata in the Australian Museum, I, 1885. 

 p. 3, 43. — Jeffrey Bell, Proc. Lin. Soc. N. S. W, IX, p. 503. 



