Zoology.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



The characters of this species are so peculiar that it is impos- 

 sible to confound it with any other. The arrangement of the 

 cells is very remarkable. They are of two sorts, the one form 

 about twice the length of the other. One row of long cells is 

 succeeded by a double row of short ones. In the short cells the 

 oral processes are of nearly equal size, while in the long ones we 

 Lave on one side of the mouth a small or moderate sized spine, 

 and on the other a large bullate process. 



Portland Bay, on algae, a single specimen ; Rev. J. E. Tenison- 

 Woods. 



Explanation op Fioubes. 



Plate 26. — Fig. 1, specimen, natural size. Fig. la, portion of ditto, magnified. Fig. 16, 

 portion of same more highly magnified, showing the discrepancy of size in the rows of cells and 

 the singularly large size of the hollow spines on the larger cells. 



Plate 26, Fig. 2. 



MEMBRANIPORA WOODSII (P. MacGil.). 



Description. — Cells oblong', arranged in longitudinal and transverse series; 

 front entirely occupied by a thick membrane; mouth large, arched above, concave 

 below, with a blunt hollow spine on either side. Avicularium at the base of a cell, 

 mandible broadly triangular, with the point rounded. 



Eeference. — P. MacGillivray, Trans. Roy. Soc. Vict., 1868. 



In the only two specimens I have seen, this species is readily 

 recognized by the peculiar arrangement of the cells, diverging in 

 slightly curved transverse rows fi-om the mesial line, as shown in 

 the plate. It may be distinguished from M. mamillaris by the 

 marks pointed out under that species, and from the M. dispar by 

 the ceUs being of uniform size, by the hollow lower lip of the 

 mouth, and by the oral spines, although fi'equently differing in size, 

 not presenting the same great disproportion. 



Portland Bay, on alg£e ; Rev. J. E. Tenison-Woods. 



Explanation of Figures. 



Plate 26. — Fig. 2, specimen, natural size. Fig. 2a, portion of same, magnified to show the 

 arrangement of the cells. Fig 26, portion, more highly magnified, showing the mouth, spines, 

 and two of the broad avicularia near the middle of figure. 



Dec. m. [ 33 ] E 



