140 



I have been able to examine a colony IVom Napier, New Zealand (Miss Jelly) 

 and another from Port Jackson, New South Wales (Mr. Waters). 



M. ligulata M. Gill., 



Craspedozoum ligulatum M. Gill., Transact, and Proceed. R. Soc. of Victoria, 



Vol. XXII, 1886, pag. 132, PI. I, fig. 3. 



(I'l. II, li^s. 8a-8c). 



In respect to form and development of spines, gymnocyst and cryptocyst the 

 zooecia essentially agree with the foregoing species. The marginal zoo^cia are 

 however generally furnished with all four spines, the two on the outer margin 

 attaining the greatest development. A rather long, calcareous process, pointing 

 basallj' and obliqueh' proximallv, springs from the inner surface of the frontal 

 wall on the proximal side of the zooecial npening It consists of a long, narrow, 

 compressed rod, terminating in a quadrangular expansion with a finely dentate 

 and striated margin (figs. 8 c, 8 e). This expansion again is composed of two 

 unequal lateral halves, bent against each other in the shape of a roof, with the 

 hollow downwards. These processes, which can easily be seen through the wall 

 when an isolated row of zooecia is viewed from the side, are subject to some 

 variation, both as regards the absolute length and the proportional size of rod 

 and terminal expansion. The lateral walls on the other hand have no processes. 

 The distal wall has a large, broad, multiporous rosette-plate (fig. 8 d) deeply 

 sinuated frontally, and as in the foregoing species we find one or more pore- 

 chambers (fig. 8 d) between the rosette-plate and the distal wall. These are 

 however generally larger and often of a peculiarly sinuated or twisted form 

 (figs. 8 b, 8d). 



The avicularia, of which only a single form is found, have a long, narrow, 

 triangular, j)ointpd mandible and two small hinge-teeth on the boundary between 

 the opercular and the subo])ercular area. In the zoa'cia without ocrcia there is 

 generally only a single, rather large avicularium |)roximally to the membranous 

 frontal area. It occupies the whole space in the proximal part of the zowcium, 

 and has not as in M. roborala a distinctly delimited, but em|)ty area at the side. 

 The mandible is most frequently turned to one of the sides. There is no internal 

 avicularium, but in some few cases a small avicularium occurs in the distal part 

 of the outer margin of the marginal zoa'cia. Above each od'cium generally two 

 small avicularia with the mandible turned obliciuely distaily and outwards. 



The ooecia have as in the preceding species a proximal, membranous area 

 which is here rounded and not bounded by an angularly bent distal margin. 



