28 



The specimens examined surround the stems of a small alga. 

 'They are of a leaden grey colour, owing to the presence of a 

 rather thick epitheca. The whole surface is rough with small 

 rounded nodules, among which, when the epitheca is removed by 

 incineration, numerous small rounded foramina are seen, 

 •especially along the margin. There is usually a large, glassy 

 nodule between the lower lip and the pore which it frequently 

 overlaps and conceals. Other larger ones are also common to 

 the sides of this and towards the margins of the cells. The pore 

 is small and plain or slightly stellate. The ooecial cells are very 

 large, with numerous large nodules either round the whole mar- 

 gin or confined to the upper part, leaving a central depression in 

 which are one or several stellate pores. The mouth is very wide, 

 not so lofty proportionately as in the others, and has the lower 

 lip straight or slightly convex. In many of the zoa?cia at the 

 lower edge of the suboral nodule is a minute avicularium with 

 the point of the mandible directed upwards and the base resting 

 on tlie pore. 



FAMILY ESCHARID.E. 



SCHIZOPORELLA, Hiucks. 



S. schizostoma, McG. St. Vincent's Gulf. 



^S. triangula, Hincks. Glenelg ; St. Vincent's Gulf. The 

 ;specimen of this occurs in the Hemeschara-form. 



The zooecia are very irregular in size and shape, confusedly 

 .arranged and separated by prominent raised lines. The oa^cia 

 are abundant and very characteristic. The lower edge is pro- 

 duced downwards into one or more blunt processes, while a 

 similar, sharper process rises upwards from each side of the 

 zofecial oral notch. 



jS. lata, McG. 



The specimen of this species occurs as a beautiful branched 

 and astomosing tube, which has evidently been moulded round a 

 sponge, of nearly three inches in greatest extent, the diameter of 

 the tubes being in some parts a quarter of an inch. 



S. biturrita, Hincks. Brighton. 



Parmularia, Busk. 

 P. obliqiia, McG. St. Vincent's Gulf. 



Smittia, Hincks. 



S. Landshorovii, Busk. Kangaroo Island. 



S. trispinosa, Johnston, sp. 



The only specimen of this species is bilaminate, and forms a 

 l^eautiful foliated ribbon-like zoarium extending up and round 

 the narrow stem of a black alga for a distance of about three 



