or Little Known, Polyzoa. 135 



A. parvipuncta, n. sp. Plate II., fig. 4. 



Zoarium small, erect, branched, the branches broad and 

 fiat. Youngest zooecia elongated, convex, mouth arched 

 above, straight or slightly projecting below ; a small, round, 

 smooth or dentate pore below the mouth. Older cells 

 distinct, rhomboidal, quincuncial, the lateral parts much 

 raised, convex, inclosing the mouth and pore in a deep 

 hollow ; pore single, and usually elongated and denticulate 

 in the zocecial cells, in the ocecial, which are broader, the 

 depression is occupied by several denticulate or stellate 

 pores. Small, triangular avicularia scattered on the edges 

 of the cells and frequently on slight eminences by the sides 

 of the mouth. Large vicarious avicularia, with triangular 

 mandibles, arranged on the free edges of the branches. 



Port Phillip Heads. 



A. austrcdis, n. sp. Plate II., figs. 2 and 8. 



Zoarium erect, formed of irregularly-divided branches, 

 flat, narrow, twisted, and truncate at the extremities. 

 Zooecia rhomboidal, convex, narrowed below, separated by 

 finely crenulated, raised lines. A small, central, stellately 

 perforated depression. Mouth arched above, straight below. 

 A median avicularium below the mouth, with the triangular 

 mandible directed obliquely upwards ; frequently another 

 avicularium towards the base of the cell. Ocecial cells very 

 broad, with the mouth much wider and shallower, not very 

 convex; occasionally with two lateral oral avicularia in 

 addition to the central one. Vicarious avicularia very large, 

 with triangular mandibles, interspersed among the zocecial 

 cells, but more frequent on the margins of the branches. 



Port Phillip Heads. Common. 



Bracebriclgia, n. gen. 



Zoarium erect, bilaminate, branched. Zooecia distinct, 

 entire ; mouth subcircular, with an internal denticle ; peri- 

 stome raised, thick. Avicularian cells on the free edges of 

 the lobate branches, the triangular mandibles with a pro- 

 jecting articular process at each lower angle. Ocecia ? 



B. pyriformis, Busk, sp. Plate II, figs. 6 -and 7. 



(Mucronella pyriformis, Challenger Polyzoa, p. — ) 



The Zoarium attains a height of one or two inches, and 

 consists of flat branches with lateral lobes, the various 



