[I'ROC. Roy. Soc. Viotoria, 25 (N.S.), Pt. II., 1913."] 



Art. XX VIII. — New or UtUe-knovn Polyzoa. 



JBy C. Af. MAPLESTONE. 



(With Plate XXVIII.). 



TKead 12tli December, l!tT2]. 



Digenopora latissima, u. .sp. (Pi. XXVIII., Fig. 1). 



Some few years ago, in the course of my examination of my 

 slides of itrent polyzoa, to compare with the fossil forms 

 upon which I Avas working, I discovered a new species of Diyeno- 

 2>(>ra (a genus of the family of Cuteuicellidae, described by me in 

 Part II. of " Further Descriptions of the Tertiary Polyzoa of Vic- 

 toria "), whicii 1 found at Williamstown in 1869, and labelled it 

 CoteiiicfUd lutatdia, overlooking the two sets of fenestrae. Ten 

 years afterwards I found it living at Portland, and hgured it in 

 my paper to the Society on " Observations on Living Polyzoa," in 

 1881, and in that figure the two sets of fenestrae are indicated 

 in one zooecium; but as the drawing was made specially to show 

 only the pigment cells in the ectocyst, other details being omitted, 

 their significance was again overlooked. Unfortunately. I have 

 only the specimen mounted at Williamstown. 



Zooecia oval ; lateral processes very wide and flat, with 

 numerous minute perforations or semi-globose elevations. Inner 

 set of fenestrae, seven ; i)yriform. imperforate, in a scutiform 

 area; outer set seven round elevations, submarginal; avicularia 

 recessed, very small, on a level with the proximal lip of the 

 thyrostome ; thvrostome arched a1x)ve, straight below with a 

 very small irregular sinus in the lower margin. Ooeciuuf 

 globose, surmounted bv a truncate conical process, a shallow 

 oval depression sun-ounded bv a raised border on each side 

 on the upper part; an irregular reniform, slightly raised area 

 on each side of the apertui'e; a small vertical oval opening in the 

 centre; apt^rturt- very large and broad, lower margin, with a sharp 

 sinus in the centre ; five large oval perforations in a curve lielow 

 and three small fenestrae underneath the sinus. 



Lorolit!/. — Williamstown and Portland. 



The colour of the zoarium when living is orange. Init the zooecia 

 are moi'e or less spotted with purple or dark green pigment cells 

 the greater or less abundance of which cause it to appeal' of various 

 shades, from orange to ])urple and dark greenish grey. 



