﻿2(54 



(Specimen junior?) 



Oreaster W ester manni UV. Dorsum deplanatum fere, 



parte superante; iessellæ marginales admodum convexæ, alternantes, 



chiorum excepta) ipsum marginem stellæ formant; areæ poriferæ 

 triangulares > sæpe confluentes, poris numerosissimis ; tuber cula 

 numerosissima mediocria obtusa in nodis trabecularum , in parte 

 centralt stellæ et basali brachiorum conica vel cylindrica fere, in 

 parte terminali brachiorum crassiora . convexa, approximata, tes- 

 sellasque marginales fere æquantia, series quinas in brachiis formant, 

 media c. 30 numerante; tubercula S duplicia paullo modo majora 

 et parum inter cetera conspicua partern centralem stellæ circum- 

 dant; tessellæ ventrales propriæ tuber culi formes, minutæ, nutnerosa, 

 propter granula obtegentia haud conspicuæ, præter granula singu- 

 lam {prope ambutacra duplicem vel triplicem) spinam crassam ob- 

 tusam gerunt; papillæ ambulacrales triseriatæ, internæ nonæ gra- 

 ciles, ceteræ crassæ, obtusæ, ternæ (rarius binæ vel quaternæ); 

 pedicellariæ valvulatæ minutæ raræ prope ambulacra. Hab. ad 



Oreaster graciiis Ltk. Corpus pentagonum, latertbus 

 rectis, angulis in brachia gracilia, angusta, acuminala , haud 

 carinata productis; dorsum minus altum; radius stellæ major 

 minorem duplum et dimidium circiter æqvat; Iessellæ marginales 

 fere 30, haud alternantes, æquales et in peripheria stellæ for- 



minutis, pediceltariis nullis ; dorsum disci regulariter reliculatum, 

 areis poriferis trigonis, trabecutis hexagonaliter dispositis, nodis 

 trabecularum tuberculiferis , luberculis minutis; in regionibus inter- 

 brachialibus et lateribus brachiorum tubercula desunt, serie singula 

 tuber culorum c. SO dorsum brachiorum percurrente ab apice usque 



