ESCHARA. 
ATHENEUS, PALLAS , MILNE-EDWARDS. 
Polyparium | sublapideum ; explanationibus rigidulis , vel 
politis ; lamelliformibus , tenuibus , fragilibus ,. intus 
porosissumis , integris , aut divisis. 
Polyporum cellule quamplnrime , contigue , adherentes 
in utraque superficie polyparü , operculata. 
Superficie utrimque fenestrata. 
P q 
Jamdiu memoratum genus investigandum nobis 
remanet; de quo tamen nec ambigua adeo, ut in 
superioribus disquisitio adest , attentis iis quce no- 
stra zetate contulerunt tum Granz (1), Lister (2), 
tum MZne-Edivards , quo duce potiora ad escha- 
ras perünentia, ipsumque genus ex professo in- 
vestigandum suscipimus. 
Docebat Pallas, escharas veperiri obwias in 
mari atque exhibere simplicem crustam, quz strata 
vel plantas constituit: si attentius eas considere- 
mus donare series continuas cellularum passim 
bifurcatas fere parallelas. 
« Ühi recentes et vivas in aqua maris, sepe re- 
novala, esce causa, servaveris escharas , extre- 
mam cujusvis seriei cellulam quasi trudere con- 
(1) Observations of on the Struct. and natur. ol flustre. Edhim- 
burg. new. phil. Journ. vol. 3. 
(2) Some observat. on the struct. and fonct. of tubul. and cellul. 
philos. transact. 1834. 
