440 L. Agassiz on the Echinodermata* 



companying figure, which was drawn from Mr. Woods's spe- 

 cimen, will, 1 trust, remove all doubts in future respecting this 

 beautiful little plant. 



ErYTIIR/EA diffusa. 



(§ Euerythraea, Ginesb.) 



E. diffusa j caulibua ca'spitosis adscendentibus inferne ramosis, ramis 



] — 3-floris, foliia mferioribua approximatis elliptico-subrotundisspathu- 



latisquc trincrviis, caulinis ellipticis oblongisque obtusiusculis, corolhc 



tubo sul) anthesi calyccm paullo superante, lobis tnbum subicquantibus 



ellipticis acutiusculis. Griesb. MSS. Tab. Nostr. 



Erythrrea diffusa, Woods, in Hook. Camp, to Bot. Mag. v. ii. p. 271. — 



Chironia maritima, Hort. Kew. Smith, in Herb, mo, apud Soc. Linn, {sed 



vixfide Woods.) — Gcntiana scilloides, Linn. Suppl. p. 175. Willd. Sp. PL 



v. i. p. 13 1G. Jioem. t y Sch. v. vi. p. 163. 



Hab. Azores, Francis Masson. On a piece of rough ground, near Mor- 

 laix, in Britany, Joseph. Woods, Esq. 



Descr. Glaberrima. Caulis gracilis, quadrangulus, digitalis fere ad spi- 

 thamscam, inferne decumbens, ramosus ; rami elongati, erecti, subsimplices, 

 apice 1 — 3 flori. Folia opposita, decussata, semiunciam longa, inferiora ap- 

 proximata elliptica vel subrotundo-spathulata, superiora niagis remota, ob- 

 longa, sessilia, omnia integerrima, obtusa, nitidiuscula, trinervia. Flores 

 terminales, solitarii, bini vel terni, majusculi, pulchcrrimc rosei ; siccitate 

 ssepe fusco-lutei. Calyx basi bibracteatus vel nudus, raro unibracteatus, 

 gracilis, 5-fidus, subangulatus, laciniis subulatis erectis tubum sequantibus. 

 Corolla hypocrateriformis. Tubus gracilis, superne angustior, ante anthesin 

 calycem vix excedente, sub anthesi calyce \ longior, limbo 4-partito, seg- 

 mentis ellipticis patentibus, acutiusculis. Anthers exsertse, oblongas, fiavae, 

 spiraliter tortse. Stylus lougitudine staminum. Stigma crassum, bilobum. 



XLIX. — Prodr omits of a Monograph of the Radiata and 

 Echinodermata. By Louis Agassiz, D.M.* 



[Continued from p. 307.] 



III. 



The Stellerides constitute the last order of the class of Echinoder- 

 mata. Their starlike form, the mobility of their rays, which are fre- 

 quently manifoldly subdivided, the position of the mouth at the centre 

 of the inferior surface, are the most prominent external characters of 

 this division, in which we must admit three families ; the Asteria?, 

 the Ophiurce, and the Crindidea. "With respect to their organization 

 Ehrenberg has recently made the interesting discovery that Astcrias 



* Translated from the Annales des Sciences Naturelles for May 1837. 



