Zoology.^ NATURAL HISTORY OF VICTORIA. IPolyzoa. 



belongs to those species agreeing with his type and the present in 

 having, among other characters, a true zooecial pore. 



Explanation of Figubes. 



Plate 175. — Fig. 1, specimen, natural size. Fig. la, two zooecia covered by the epitheca. 

 Fig. 1 6, zooecium denuded of the epitheca. 



Plate 175, Figs. 2, 3, 4, 5. 

 MICROPORELLA DIADEM A (McG.). 



VARIETIES LUNIPUNCTA, LONGISPINA, LATA, AND CANALICULATA. 



[Genus MICKOPORELLA (IIincks). (Sub-kingdom MoUusca. Class Polyzoa. Order 

 Infundibulata. .Sub-order Cheilostomata. Family MicroporellidEe.) 



Gen. Char. — Mouth arched above, straight below, peristome not raised ; a single zooecial 

 pore or a perforated plate below the mouth. Ooecia external. ] 



The ordinary form of this common and beautiful species has 

 been already figured in Plate 37, fig. 6, and described. It is sub- 

 ject to considerable variation, principally in the markings of the 

 surfece, the size and form of the zocecial pore, as well as the spines 

 and ooecium. Lepralia lunata (Plate 36, fig. 8) is also referable 

 to the same species. Mr. Waters considers M. diadema as a form 

 of the fossil Eschara decorata of Reuss, a determination with 

 which I cannot agi'ee. 



The following varieties are worthy of distinction : — 

 Variety hiiu'jntncta (McG.). Zooecia broad, smooth and slightly 

 grooved at the edge. Zooecial pore a narrow lunate slit, equalling 

 the mouth in width. Avicularia large, below the pore, with the 

 mandible pointed upwards and outwards. Tr. Roy. Soc. Vict., 

 Nov. 1884. 



Variety longispina (McG.). Zooecia broad, slightly calcareous, 

 grooved at the edges ; oral spines large, long, the lower on one or 

 both sides of enormous length, antenniform, and articulated out- 

 side the peristome. Zooecial pore round, oval or semicircular, of 

 moderate or ratlier small size. Avicularia opposite the pore, 

 pointing downwards and outwards. Tr. Roy. Soc. Vict., Nov. 



1884. 



[ 272 ] 



