280 C. M. Maplestone: 



Cribrilina tenuicosta, McG., sp. (PI. XLVII., Fig. 34). 

 Membraniporella tenuicosta, McG. 



I have included an illustration of a specimen of this species, as 

 upon it there is an avicularium, which has not hitherto been 

 recorded. I have assigned the species to Crihrilina, as it evi- 

 dently belongs to it. Dr. MacGillivray was himself inclined to 

 do the same. 



Aspidostoma otwayensis, n. sp. (PI. XLYII., Fig. 35). 



Zoarium in vincularian form. Zooecia elongated, arched 

 above with a thick, smooth, convex margin, which extends proxi- 

 mally towards the base, leaving the median portion depressed 

 on each side, but slightly elevated in the centre. Thyrostome 

 arched above, curved below, with a narrow lip. 



Locality. — Cape Otway (Dr. Hall). 



This differs from A. airensis from the Aire coastal beds in the 

 distal margin of the zooecia, not being produced into a conical 

 process, and the absence of a sinus at the angles of the proximal 

 margin of the thyrostome, and the absence of avicularia. 



Phylactella bairnsdalei, n. sp. (PI. XLYII., Fig. 36j. 



Zoarium encrusting. Zooecia undefined, frontal surface per- 

 forated with large, somewhat regularly disposed, elongated 

 pores : two small raised cylindrical processes, with a pore on tlie 

 summit below the thyrostome ; one close to peristome, the 

 other lower down and on one side. Peristome tubular, project- 

 ing forwards and upwards, concealing the thyrostome. 



Locality. — Mitchell River (J. Dennant). 



The specimen is small, only three peristomes are present, and 

 there are no pores upon them. The pores are arranged in more 

 or less regular longitudinal order. This is possibly the species 

 from the same locality alluded to by Dr. MacGillivray as being 

 too imperfect for description. 



Monopopella venusta, Eichwald. (PI. XLVIL, Fig. 37). 



Lepralia venusta Eichwald. Manzoni. Sitzb. d. mathem- 

 naturw., CI. lix., Bd. 1., Abth. p. 20 (1869). 



