BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 13. AID. IV. N:0 5. 49 



II. 



The Linnean species of Echinoidea. 



The third part of the Museum Ludovicae Ulricae, which 

 treats of the genera Asterias and Echinus, although it appeared 

 in 1764 as a late additament to the S. N. ed. 10, 1758, existed 

 like the other parts of that work, as a manuscript, at least 

 as earlv as the summer of 1752. This is obvioiTS from the 

 manner in which those two genera are introduced in the Lec- 

 tures, so often quoted, of the autumn of tliat year. »The 

 Arehiater», one of his hearers writes, : having had an oppor- 

 tunity of seeing a number of species of Asterias, has divided 

 them into Radiatse and Stellatae; . Then comc seven species, 

 six of them with diagnoses all but identical with those of the 

 corresponding species in the M. L. U.. where tliey are namcd 

 Asterias pectinata, A. ophiura, A. glacialis, A. rubens, A. 

 aranciaca, A. quadrifida, and a seventh, probably löst after- 

 wards: »radiis octo, alterius lateris brevissimis, CoL. Aquat. t. 

 ^, vulgo Cometa.» »These are the known species of this genus; 

 they are all in the Queen's Museum.» In the M. L. U. three 

 raore were added: A. Caput Medusse, described in the Museum 

 Regis, and A. reticulata and A. laevigata, both from that of 

 €ount Tessiij. 



Of the Echini it is said: »In the Queen's Cabiuet there 

 is a considerable collection of these, from which, and from 

 what the authors have relatinsr to them, the Arehiater has 

 made out the species here following.* These are fourtcen, 

 the same that made the original set of the geiuis in the 

 Drottningholm Museum, the species 1, 2, o, 4, 5, 6, 7, 8, 9, 

 11, 12, la, 15, 16 of the work of 1764, the niimbcrs K» and 

 14 being låter acquisitions. 



Out of these sixteen species of the M. L. U. six are 

 missing, while ten are present, in the collection preserved in 



4 



