BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 13. AFD. IV, N:0 5. 65 



1758. Echinus esculentus L. S. X. 1872. Al. Agass., Rev., p. 



123,491, t. VII«fig.7. 

 1776. Echinus Sph^ra O. F. Muller, Z. D. Prodr. p. 235, n. 2845. 



» » » 1817. Nilsson, Collectanea 



Zoologife Scandina-' 

 vicas, p. 4. 



» » » 1841. FoRBES, Brit. Star- 



fielies, p. 149. 



» » » 1841. Agassiz, Mon. d'E- 



chinod., IV, Préface, 

 p. III. 



Of the four following species. Nos: 2 to 5, Linn^us in his 

 Lecture 1752 said: »They are in the Queen's cabinet, but no 

 anthor ha.s them, and they are verv rare», and in his piiblished 

 works their diagnoses remain uualtcred, without any refe- 

 rences. Foremost among them he placed two species of the 

 now well-known groiip of Temnopleuridse, characterised by the 

 presence of »puncta semipertusa» at the angles of the su- 

 tnres, interradial as Avell as ambulacral. Thus he was the 

 first to perceive an important feature, not realized till long 

 afterwards, at first overlooked then attended to by Leske*), 

 neglected by Lamarck-), but found again by Blainville •'), 

 and noAv a subject of special research. 



Whcn the diagnoses and descriptions of Nos: 2 and 3 are 

 comparcd respectively it becomes evident that an interchange 

 of schedules has taken place. The diagnosis of No. 2 says: 

 ^>areis laterc muricatis», while the description has: »Discus 

 etiam adspersus punctis minoribus prominentibus». On the 

 other hand the diagnosis of No. 3 has: »areis xindique muri- 

 catis», while the description says: »Discus longitudinaliter 

 glaber». To remove this contradiction, probably caused by 

 an inadvertency of the transcriber, it is necessary only to 

 transpose the descriptions, by placing that of No. 3 under the 

 diaofnosis of No. 2, and vice versa. In this manner the order 

 is restored, as follows: 



') Addit, p. 96, I.-.2. 



^) Echiuus ovum, E. pallidus. An. s. vevt., III, p. 48; 181(). 



3) Diet. se. nat., XXXVII, p. 82: 1825. 



