-POLYPT. 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.) 
Eschara Lam. (Species of genus Eschara Patt, 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 Pat.) Exy. Corall. xxx. fig. 
a, A, B, C ;—Eschara cervicornis Lam., Cuv. R. Ani. édit. ill., Zooph. Pl. 
86, &e. 
Comp. on this genus Minne Epwarps, Rech. anatomiques, physiol. et 
zool. sur les Eschares, Annal. des Sc. nat. 2¢ Série. v1. 1836, Zool. pp- 5— 
53, Pl. 1—v; Observations sur les polypiers fossiles du genre Eschare, ibid. 
pp. 321—345. Pl. 1x—xt. These fossils occur partly in the chalk-forma- 
tion, partly in the tertiary strata. M°Coy, Deserip. Brit. Palwoz. Foss. in the 
Geol. Mus. of the Univ. of Cambridge. Camb, 1851. 4to. Pt. IL. pp. 44—47. 
Pl. fig. 14—17. 
Melicerita Mine-Epwarps. Fossil genus. Comp. Ann. des Se. 
nat. 2e Sér. v1. Zool. pp. 345—347. 
Retepora 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 cellulosa L., Euu. Corall. Tab, xxv. fig. d, 
D, F; Esper, Pflanzenth., Millep. Tab. 1.; Cavournt, Polipi marini. Tab. 
m1. 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 foliifera Lam., Scuwxicerr Beob. auf naturh. Reis. Tab. 1; 
Cuv. R. Ani. édit. ill. Zooph. Pl. 88, fig. 1 ;—Adeona cribriformis Lam., 
ScHweIceer 1. 1. Tab, 11. fig. 5, Cuv. 1. 1. fig. 2. In this species the stem 
bears a flattened expansion, perforated like a sieve ora 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 upon a jointed stem. 
