POLYPI. 93 



the Echinodermata, so in this last order we cannot mistake the 

 affinity to the Mollusca; this affinity is even so close that we hold 

 the union of it with the Molluscs to be almost the more natural 

 one. 



Family XIV. Stelmatopoda nob. Tentacles disposed in a zone 

 around the mouth. 



A.) Cell (the posterior harder portion of the animal) covered by 

 a moveable operculum. (Tentacles numerous, 16 or more.) 



Eschar a LAM. (Species of genus Eschar a PALL., of Millepora 

 L.) Polypary of aggregate cells substony, foliaceous, ramose. 

 Both surfaces of the polypary covered with opposed cells. 



Crust-Coral. Sp. Eschara foliacea LAM. (not PALL.) ELL. Corall. xxx. fig. 

 a, A, B, C ; Eschara cermcomis LAM., Cuv. R. Ani. tdit. ill., Zooph. PI. 

 86, &c. 



Comp. on this genus MILNE EDWAKDS, Reck, anatomiques, physiol. et 

 zool. sur les Esckares, Annal. des Sc. nat. ie Serie. VI. 1836, Zool. pp. 5 

 53, PI. I v ; Observations sur les polypiers fossiles du genre Eschare, ibid, 

 pp. 321 345. PI. IX xii. These fossils occur partly in the chalk-forma- 

 tion, partly in the tertiary strata. M c CoY, Descrip. Brit. Palceoz. Foss. in the 

 Geol. Mus. of the Univ. of Cambridge. Camb. 1851. 4to. Pt. n. pp. 44 47. 

 PL fig. 1417- 



Melicerita MILNE-EDWARDS. Fossil genus. Comp. Ann. des Sc. 

 nat. 2e Ser. vi. Zool. pp. 345347. 



Eetepora LAM. Polypary reticulato-ramose or perforated reticu- 

 lately, calcareous. Cells of the Polyps situated on one side only of 

 the polypary. 



Sp. Retepora cellulosa, Millepora cettulosa L., ELL. Corall. Tab. xxv. fig. d, 

 D, F ; ESPER, PflanzentJi., Millep. Tab. I. ; CAVOLINI, Polipi marini. Tab. 

 in. fig. 12, 13. This polypary resembles a piece of fine lace, hence the 

 french name dentelle de mer or manchette de Neptune (/) 



Adeona LAMOUR., LAM. Polypary frondescent or fan-shaped, 

 on both surfaces celluliferous, calcareous, supported by a stem sub- 

 articulate, not polypiferous. 



Sp. Adeona foliif era LAM., SCHWEIGGER Beob. auf naturh. Reis. Tab. i; 

 Cuv. R. Ani. edit. ill. Zooph. PI. 88, fig. i ; Adeona cribriformis LAM., 

 SCHWEIGGEK 1. 1. Tab. II. fig. 5, Cuv. 1. 1. fig. i. In this species the stem 

 bears a flattened expansion, perforated like a sieve or a net, from coalescence 

 of the branches, and permanence of the intervening spaces. 



Of this genus the Polyps, as far as I know, have not been observed, but 

 it is placed here from the agreement of the Polypary ; an idea may be 

 formed of it by supposing an Eschara to be placed uppn a jointed stem. 



