CLASSIFIOATTON 39 



Nardo^ proposed to divide the European star-fishes into ti\e genera, several oC 

 which correspond with the Linckian genera : 1st. Stklt.auia = Astuopectkx, Linck 

 (inchides J. (lurantiaca, A. (■((/cilrdpa), 2n(i. Stei.t.onma = STi'.Lr;.\-c:or.iACi;A, Linck 

 (./. rifbcnx, A. (/lacialis). 3rd. Asterina ^ Pkntackros, Linck fA- cxiyua, A. tuinnhij. 

 4th. Anseropoda = Palmipks, Linck (A. iiieinbranaccd, A. roKnccd). a\\\. TjIN('kia = 

 Pentadactylgsaster, Linck CA. hpvif/a/r/, A. vario/o'<fij. 



I'rofcssor Agassiz/ in his arrangement of the I^lchinoderniata, pro])osc(l a division oC 

 the Asteriada; into nine genera, in which he substitnted new names for Nardo's genera, 

 and added others for extra European and extinct species. This arrangement is irrespec- 

 tive of the iiuniher of tlie I'avs. 



1. Asterias, kg. {:=■ Asfropcclen, Linck; Creuastcr, Luid. ; Pentasterie, )i\\.\\n\.; 



SieUaria, Nardo.) The body stellate, the upper surface tesselatc, and the rays 

 depressed ; the margin bordered with two rows of large plates, carrying small 

 spines. Types of this genus, A. am'antiaca, A. calcitrcqja. 



2. CiELASTER, Ag. — This genus differs from the preceding in having the inner cavity 



circumscribed by plates disposed as in the EcJmiidce, and having in the anal area 

 an ambulacral star. Type, C. Couloni, Ag. 



3. GoNiASTER, Ag. (= Pentagonastcr, Linck; Pentaceros, Linck; Scidasterie, Blainv. 



The body pentagonal, margin bordered by a double series of large plates which 

 support spines and granules, upper surface nodulated. Types, A. iesseUaia, 

 Lamk. ; A. egnesfris, Linn. 



4. Ophidiaster, Ag. — Rays long, cylindrical, or conical, covered with fine, close-set 



granules, ambidacral area very narrow. Type, Asterias ojjhidiana, Lamk. 



5. LiNCKiA, Nardo (= Pentadacfylosaster, Linck). Body stellate ; rays elongated, 



covered with tubercules, showing the porous integument in the intertubercular 

 spaces. Type, A. variolata, Lamk. ; Linck, Stel. Mar., tab. viii, fig. 10. 



6. Stellonia, Nardo (= Stella coriacea, Linck ; Pentasteries in part and Solasteries, 



Blainv.) The body stellate and covered with spines more or less prominent. 

 Types, A. rube?is, Linn. ; A. gJacialis, Lirm. ; A. endeca, Linn., Linck, tab. xv, 

 fig. 1 ; A.papposa, lihin., Linck, tab. xvii, No. 28 ; A. helianthus, Lamk. ; Enc. 

 Moth., PI. 108. 



' 'Natnrforscher,' 1833. ♦ Isie,' 1834. 



^ 'Memoires Soc. Sciences Naturelles de Neufchatel,' (oin. i, p. 190, 1836. 



