IDMONEHLE. 107 



evenness of the surface, show that it is more properly referable to Idmonea. In specimens 

 of sufficient size, it is readily distinguishable by its peculiarly intricate mode of growth, not 

 unlike, in miniature, that of Intricaria bajocensis, and in which it is nearly paralleled by a 

 recent Australian Idmonea or rather Pustulopora, which has not yet received a name. 



Genus 3. PUSTULOPORA, Blainville. 



Polyzoario ramoso ; ramis cylindricis clavatis seu teretibus, e cellulis elongatis superne 

 liberis, et undequaque spectantibus composite. 



Polyzoarium ramose ; branches cylindrical, clavate or terete ; composed of tubular 

 cells, which open on all sides of the branch. 



PUSTULOPOKA, Blainville, Man. d'Act., p. 418, 1834 (pars) ; M. Edwards ; Hagenow (sp.) 



Maastr. Kreid. (not Gein. Grundr.) lieuss ; Michelin. 

 ENTALOPHORA, Lamouroux, Expos. Meth., p. 80, 1821 ; VOrligny (pars). 

 CEIUOPOKA (pars), Goldfuss (?) ; Hagenow (?) Gein. Grund. 



I have adopted Blainville's name for this genus, more for the reason that it has 

 come into general acceptation, especially since its accurate definition by Milne-Edwards, 

 than because I am satisfied it should have precedence of Entalophora, a term under 

 which it appears quite clear that Lamouroux had intended to include similar forms. 

 The prior appellation, however, having fallen into abeyance, except by M. D'Orbigny, 

 whose genus Entalophora, moreover, is not confined to Cyclostomatous forms only, it 

 seemed unadvisable, merely for the sake of somewhat pedantic propriety, here to revive it. 



As it is very doubtful whether Goldfuss had any knowledge of forms really appertain- 

 ing to the genus Pustulopora as now understood, I have not included his term Ceriopora 

 among the list of synonyms ; and the same observation applies to the Ceriopora of 

 Hagenow, as defined in ' Geintz. Grundr.' p. 593. 



1. PUST. CLAVATA (tl. ftp.) PI. XVII, fig. 1. 



Rarnis clavatis. 



Branches clavate or thickened at the extremity ; surface entire ; tubes not annulated. 



Habitat C. Crag, 8. Wood. 



The only forms with which this species can well be confounded, are : 



P. GKACILIS, Milne-Edwards, Mem. s. les Crisies, &c., p. 28, pi. xi, fig. 4 (not Michelin, 



Icon. Zoophyt., p. 210, pi. liii, fig. 2). 

 P.ECHINATA, Earner ; D'Orbigny, 1. c., pi. Dcxxii, fig. 36 ; Michelin, Icon. Zoophyt, p. 211, 



pi. liii, fig. 5. 

 ENTALOPHORA LINEAKIS, D'Orbigny, op. cit., pi. Dcxxii, fig. 6. 



Habitat. C. Crag, S. Wood. 



