with Notes on Bicellaria Grandis. 43 



different in the two species. In the one each cell springs 

 from a tubular process on the breast of another cell, and the 

 cells are only attached to each other at two points, while in 

 B. grandis each cell springs directly from a ringed process on 

 the back of another, and the cells are more closely adnate to 

 each other throughout their whole length. In size also there 

 is a great disparity between the two species, B. pectogemma 

 being rather less than one-third that of B. grandis. The 

 submarginal spine-bearing process is much more produced 

 in the latter species, which is very common on this coast, 

 and exhibits only very slight variations. I append a figure 

 of B. grandis (plate I., figs. 3 and 3a) showing front and back 

 views, not only for comparison but also to show its ovicell 

 and fine avicularium, neither of which have been figured 

 before. 



Family Farciminariad^e, Busk 

 Malakosaria, nov. gen. 



Zoarium chitinous, flexible, cells raised, flat, rounded, or 

 tubular, not bounded by raised lines. 

 Malakosaria pholaramphos, n. sp. Plate II.; Figs. 4 and 4a. 



Cells ventricose, rounded ; mouth near distal end, large, 

 arched above, narrowed below, lower lip straight, surrounded 

 by a wide raised border, the upper angles of which are 

 produced so as to form a short blunt process on each side, 

 below which is an immersed oval avicularium on each side 

 facing laterally, lying hidden from view in front ; space 

 below mouth ornamented with two circular depressions, 

 having a fissal line between, and a sharp, raised, transverse 

 line below, curved upwards at each end ; two oval marks on 

 the space above mouth ; colour of zoarium, light brown. 



Locality. — Marion Islands. " Challenger" Expedition. 



There is a peculiarity about the sharp raised line on the 

 front of each cell below the mouth, in that it looks like a 

 lid ; it may possibly prove to be a form of avicularium. 

 The genus Tetraplaria* erected by the Rev. J. E. Tenison- 

 Woods for a fossil from the Muddy Creek beds, Victoria, 

 may seem to cover this species ; but the cells are not in 

 pairs as in that genus, which the author has placed in 

 Busk's family of Gemellariam; on that account. At 



*Proc. Boy. Soc. Neiv South Wales, 1878, Vol. XII, p. 60. 



