MARINE POLYZOA. 63 



2. LEPRALIA. 



Polyzoarium adnate, crustaceous, spreading from a centre in a 

 more or less circular form ; composed of contiguous or connected, 

 calcareous, decumbent cells, the walls of which are complete in 

 front. 



Eschara (sp.), Moll, Seerinde ; Pallas, Elench. 



Lepralia, Johnst. Brit. Zooph. ed. 2. p. 300 ; Gray, List Brit. 



Rad. p. 148 (part.). 

 Berenicea, Flem. Brit. An. 533, 1828 ; not Lamx. Exp. 80, 1821 ; 



nor Per on. 

 Escharina, sp., M.-Edw. Lamk. Hist. ed. 2. ii. 230; Gray, App. 



p. 148. 



Escharoide, sp., M.-Edw. Lamk. Hist. ed. 2. ii. 259 ? 

 Cellepora, sp., Oken, Lehrb. Nat. 86, 1815 ; Audouin, Expl. 



Savigny, Egypt, (part.); Lamouroux (part.) ; Hayenow (part.). 

 Flustra, id. ib. ; Lamouroux (part.). 

 Discopora, Lamarck, Hist, (part.) ; Gray, App. p. 148 (part.); 



Lamouroux, Exp. Meth. (part.) 

 Cribrillina, Herentia, Escharella, Porella, Celleporella (all spec.), 



Gray, App. List Brit. Rad. pp. 147, 148, 149. 



The very great number of species included under the above 

 generic definition renders some subdivision of them indispensably 

 requisite for the convenient determination of any particular form. 

 In the absence of more precise knowledge respecting the living 

 animals, we are not, I conceive, at present in a condition to pro- 

 pose a satisfactory natural arrangement, and the following dispo- 

 sition of the species therefore must only be regarded as artificial 

 and contrived solely for the purpose of convenient reference. 



SYNOPSIS of the Species of LEPRALIA. 



1. ArmatcK. Species provided with either avicularia or vibra- 

 cula. 



A. Species having avicularia. 

 a. Median and single. 



* Superior (above the mouth). 



1. L. Brongniartii 65 



** Inferior (below the mouth). 



2. L. Landsborovii 66 



3. L. galeata 66 



4. L. reticulata 6( 



5. L. marionensis 67 



