REPORT ON THE POLYZOA. ' 9 



§ yS. The otitennost zocecia in the lateral series the longest ; isolated zooecia opening 

 in the space on the front between the lateral series. 



(6) Idmonea milneana, d'Orb. 



(7) Idmonea irregularis, Meneghini. 



(8) Idmonea fissurata, n. sp. (PL III. jBg. 5). 



2. Hornera, Lamx. 



§ a. Zoarium branched, branches free or rarely inosculating. 



§§ a. Ooecia dorsal ; anterior surface of branches reticulato-fibrillate. 



(1) Hornera frondiculata, Lamx. 



(2) Hornera lichenoides, Linn. 



§§ h. Ocecia anterior, either wholly or in part ; surface in front not fibrillated 

 or sulcate. 



(3) Hornera violacea, Sars. 



§ y8. Zoarium foliaceous, branches connected by transverse tubules. 



(4) Hornera foliacea, Macgilliv. 



3. Pustulopora, Blainv. 



(1) Pustulopora proboscidea (PI. IV. fig. 1). 



(2) Pustulopora proboscidioides, (PI. IV. fig. 4). 



(3) Pustulopora deflexa, Smitt (PI. IV. fig. 3). 



(4) Pustulopora regularis, Macgilliv. (PI. IV. fig. 2). 



1. Idmonea, Lamouroux. 



Idmonea, Lamx., Exp. M^th., p. 80; Def ranee, Blainville, M. -Edwards, Johnst, Lonsdale, 

 Eeuss, Michelin, Hagenow, d'Orb, 1852 (pars) ; Busk, Van Beneden, Hincka, Smitt 

 (subgenus), &c. 



Crista (pars), d'Orbigny, Stoliczka. 



Retepora (pars), Goldfuss, Lamk. • 



Diastopora (pars) Michelin. 



TubuUpora (pars), Lamk., Smitt. 



Crisiua (pars), d'Orbigny, Smitt. 



Character. — Zoarium erect, free or very partially adnate, branched dichotomously or 

 irregularly ; springing from a single tubular cell, having a constricted, basal, discoid 

 expansion. Branches free or anastomosing ; orifices of zocecia disposed in parallel or 

 subparaUel, transverse or oblique, usually alternate aeries on the sides of the front of the 



(ZOOL. CHALL. KIP. — PAST U — 1886.) DJd 2 



