132 Descriptions of New, 



cell to form, by their junction, a large collar, obscuring the 

 lower part of the mouth. Busk's L. thyreophora, already 

 shown by Hincks to be an unimportant variety of M. 

 Malusii, also occurs at the Heads. 



Lagenipora tuberculata, n. sp. Fig. 15. 



Cells large, flask-shaped, erect or semi-erect ; mouth 

 rounded or oval, with a thickened projecting peristome ; 

 surface studded with large, hollow, pointed tubercles, which 

 occasionally, owing to attrition, form raised pores. 



Port Phillip Heads. 



Schizoporella lata, n. sp. Fig. 7. 



Cells quadrate or oval, arranged in linear series ; front 

 slightly convex, granulo-punctured ; mouth large, with a 

 rather wide, shallow-pointed sinus below ; below the mouth 

 is a small elevation bearing a minute avicularium ; ovicell 

 large, rounded, thickly punctate. 



Port Phillip Heads. 



S. triangula (Hincks), which also accurs here, differs in 

 the cells being much flatter, the mouth wider, and the suboral 

 avicularium larger and more distinct. 



Schizoporella insignis, n. sp. Fig. 11. 



Cells large, quincuncial, indistinct ; surface deeply 

 areolated ; mouth semicircular, or rather higher than wide, 

 nearly straight below, and with a deep rounded sinus; four or 

 five spines above; avicularia very large, situated below and 

 outside the mouth, on one or both sides, and with the 

 mandible extending obliquely upwards and outwards to 

 nearly opposite the centre of the upper margin of the 

 mouth of the cell in the adjacent series ; ovicell mitriform, 

 deeply imbeded in the cell above, divided into two parts by 

 a thick ridge parallel to the outer edge, the inner part nearly 

 smooth but areolated at the edges, the outer sloping and also 

 deeply areolated. 



Dredged off Port Phillip Heads by Mr. Wilson and myself, 

 always in the Hemeschara form. 



The mandible of the avicularium is sometimes much 

 narrower and more pointed, and also situated lower down, 

 than in the specimen figured. 



