118 A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 



deal in recent specimens. In the fossil the avicularinm is at one side, almost within 

 the aperture, and at the other side is a small sinus or pore ; this is the normal 

 arrangement. 



Sub-order CYCLOSTOMATA, Busk. 

 I. ARTTCULATA S. RADICATA. 



Zoarium erect, branched, divided into distinct internodes by flexible joints, 

 attached by radical tubes. Zooecia tubular, calcareous, in one or two series. 



Family CrisiibvE. 

 The only family. 



Crisia, Lamouroux. 

 Two or more zooecia in each internode, in two alternate series. 



1. C. macrostoma, n.sp. PL XVI., figs. 3, 4. 



Branches narrow, cylindrical, closely and distinctly punctate. Zooecia entirely 

 connate and undistinguishable ; thyrostome rounded or elliptical, opening outwards 

 and uj)wards. 



M.C. 



I have only a few specimens of this species and none of them seem to represent 

 complete internodes. The zooecia are quite indistinct throughout. In that shewn 

 in fig. 3 there is a faint raised line along the middle marking the division of the two 

 series of zooecia. 



2. C. gracilis, n.sp. PL XVI., fig. 5. 



Branches very slender, punctate. Zooecia closely adnate throughout but defined 

 on the surface, arched outwards ; thyrostome circular, scarcely projecting and 

 opening outwards and upwards. 



M.C. 



Closely allied to the last, of which it may be a slender variety. It differs in 

 the zooecia being defined on the surface by a faint groove and being more arched 

 outwards. The puncta are also fewer and smaller. 



3. C. acropora, Busk. PL XVI., figs. 2, 8, 9. 



C. acropora, Busk, Voy. of " Rattlesnake," Vol. I., 351; B.M.C., III., 6; 

 C.P., II., 6; McG., P.Z.V., 39. 



