Australian Polyzoa. 135 



L. megasoma. 



Cells large, distinct, oblique ; surface smooth or obscurely- 

 grooved ; mouth large, edges thickened, lower lip with a 

 shallow notch. 



Queenscliff, on mussel shell. 



L. crystallina. 



Cells large, irregularly hexagonal or rounded above, sepa- 

 rated by narrow raised lines ; regularly minutely tubercular 

 in front ; mouth rounded above, lower margin straight, 

 with a deep rounded notch. 



Queen sclifF, on old shell. 



In this very beautiful species the cells are wide, project- 

 ing little ; at the bottom of the hollow between contiguous 

 cells there is a narrow raised line ; the front is thickly 

 covered with small, round tubercles, except in the middle, a 

 small portion of which is usually smooth ; these granulations 

 when worn, as they usually are at the apices, leave small 

 foramina. 



L. Ellerii. 



Cells large, oblique, distinct ; surface cribriform ; lower 

 lip thickened and produced into a variable number of pro- 

 cesses ; frequently a median triangular one, and several 

 smaller at the sides ; in some cells the median projection has 

 a small avicularium on one side. Oviceil broad, granular 

 above. 



Frequent on algse and shells. 



L. cheilodon. 



Cells small, oval, separated by narrow raised lines ; surface 

 granular, usually with a row of small areolations along the 

 margin ; mouth rounded or arched ; lip thickened, and with 

 a broad denticle inferiorly. Oviceil globular, granular. 



Willi anist own, on shell. 



L. schizostoma. 



Cells elongated, distinct, arranged in lines ; surface gran- 

 ular, granulations usually larger and closer about the middle 

 of the cell ; mouth semicircular above, lower lip straight, 

 with a deep narrow slit in the middle. Oviceil large, 

 granular. 



Williamstown, on shell. 



