BIHANG TILL K. sv. VET.-AKAD. HANDL. BAND 13. AFD. IV. \:0 5. 123 



solum circnlo fere simplici, subito demisssum, et in stratum 

 condensatum aequiim, granulis punctatiim minutis, transverse 

 dispositis, leviter divaricatis; 



In calyce subtile, divaricatum. 



Spin.e longas, robustas, aciculatae, diametro testJe non mul- 

 tum breviores; ambulacrales superiores tres 1. quatuor breves, 

 crassiusculae, leviter curvata^ et compressse, basales abbreviatge, 

 sub-spathulatae, crustula apicis marginata, utriuque descendens, 

 longa, quartam partem longitudinis totalis attingens, cristis 

 saepius quatuor, brevibus. 



CoLOR in recentibus csesius, vetustate pallescens, in roseum 

 et violaceum vergens, verrucee albidae, mamilla virescente, zonae 

 obscuras. 



Mensur^e: diam. 42 mm. altit. 21 mm. 

 . 39 22 :• 



» 38 » » 21 >^ 

 » 35 > » 20 » 



The two species numbered 6 and 7, Echinus saxatilis L. 

 and E. Diadema L., were re^arded bv Linn.eus as closely 

 related, and are to be considered simultaneously. But first ot 

 all the orioinal reading- of the diao-nosis of the Xo 7 must be 

 restored. The Systema Natura^, ed. 10, 1758 p. 664 and ed. 12, 

 1767, p. 1103, No 7, have: »ambulacris quinis longitudinaliter 

 verrucosis; areis lanceolatis», and the Mus. Lud. Ulr., 1764, 

 p. 709: »areis quinis lanceolatis, ambulacris longitudinaliter 

 verrucosis». All this is without meaning and evidently per- 

 verted. The notes from the lectures of 1752 accord in 

 giving, from the dictation of LiNN^us: »ambulacris quinis lan- 

 ceolatis; areis longitudinaliter verrucosis. A ulgo Diadema». 

 When compared with the description in the M. L. U., and the 

 diaffnosis of B. saxatilis, this readino- comes forth as the onlv 

 true one. 



In one point the descriptions of these two species present 

 a very remarkable deviation from the method used throughout 

 for the other Echini Regulares. Whiie, when these are de- 

 scribed, »Testa», »Ambulacra», and »Are^e» follow conti- 

 nuously one upon another, Linn^eus has here inserted between 

 »Testa» and »Ambulacra» a supplemental description of the 

 dorsal and ventral aspects, drawn up in terms nowhere else 



