442 



Galaxaura, Lamow, 



Where the stems are dichotomous, but their branches hollow *. 



LiAGORA, L amour, 



Where the stems are hollow and dichotomous, but are without arti- 

 culations f . 



It is perhaps directly after the Corallinse that should come tlie 



Anadiomene, Lamour, 



Vulgarly termed Corsican Moss, and which is so useful as a vermi- 



It is composed of articulations, regularly ramous, and consists of a 

 somewhat corneous substance invested with a gelatinous covering \. 



Of all these productions without apparent Polypi, which are con- 

 jecturally referred to the Coralliferi, few are more singular than the 

 Acetabula, or 



Acetabulum, Lam., 



Where we find a slender and hollow stem supporting a round thin 

 plate, like a parasol, with radiating striae. Granulated at the edge and 

 having a little smooth disk surrounded with pores in the centre. No 

 Polypi can be discovered in them. The rays of the disk are hollow 

 and contain greenish granules, a circumstance which led Cavolini to 

 consider them as plants §. 



One of them — Tubularia acetabulum, Gm. — Donat., Adri,, 

 III; Tournef., Ins. CCCXVIII||,is found in the Mediterranean. 



PoLYPHYSA, Lam., 



Where, as in the preceding, we find a hollow and slender stem, but 

 Avhich bears on its summit a bundle of little closed vesicles in place of 

 a disk formed of tubes ^. 



* Corallina ohtusata, Sol. and Ell., XXII, 2 ; — C. lapidescens, Id., lb., 9; — Tu- 

 bularia fragilis, L. ; Sloane, Jam., XXX, 10; — Tubul. mnbellata, Esper, Tubul., 

 XVII ; — Corallina marginata, Sol. and Ell., XXII, 6 ; — Corall. fruticulosa, lb., 5 ; — 

 Galaxaure roide, Zool. de Freycin., pi. 91, f. 10, 11. 



f Corallina marginata, Sol. and Ell., XXII, 6 ; — C. fruticulosa, Id., lb., 5. 



X Anadiomene flabellafa, Lamour., Poll. Flex., XIY, f. 3, and Sol. and Ell., App., 

 pi. 69, f. 15, 16. 



N.B. The Galaxaursfi and Liagorse form the genus Dichotomaria of Lamarck, 

 but are not, as that naturalist thought, vaginiform Coralliferi, for there are no Polypi 

 in the tube. 



§ I cannot find the openings round the circumference mentioned by M.de Lamarck. 

 The tubes which form the rays are closed. The pretended tentacula described by 

 Donati were foreign bodies. Neither the Acetabula nor Poti/physa are vaginiform 

 Polypi. 



N.B. Since the first edition of this work, M. Rafeneau, of Lille, has presented a 

 Memoir to the Academy, in which he considers the Acetabulum as a plant, belonging 

 to the family of the Conferva;. 



II Add the Acetabule petit godet, Zool. de Freycin., pi. xc, f. 6, 7. 



H Pol. aspergillum, Lamour; Sol. and Ell., App., pi. 69, f. 2 — 6, or Fucus penicu- 

 lus, D. Turner, Fuc, IV, pi. 228. 



