TOLYZOA. 117 



It has a coarse looking, roughened surface and is of a greenish colour, somewhat 

 obscured by a brownish surface layer or membrane ; zooecium prostrate, irregularly 

 oval, ventricose and punctured closely all over the front wall ; often with an umbo in 

 its centre, or to one side, which may become tall and massive. Orifice with a deeply 

 rounded sinus, peristome raised above. 



Avicularia small and pointed, one or two transversely placed below the orifice, and 

 a few long and sword-shaped, on separate areas, scattered over the zoarium. 



Locality : Coral banks, Gulf of Manaar. 



This fine species forms thick massive colonies of many superimposed layers, and 

 spreads over other objects to form very large masses ; one colony measures upwards 

 of 53 centime, in length by 18 centims. in breadth and 23 millims. in thickness. The 

 verdigris-green colour is a striking feature, best seen in the thickness of the super- 

 imposed layers at the edges of broken pieces ; a brown membrane which envelops 

 the zoarium conceals it, somewhat, on the surface. The large ventricose zooecia and 

 ocecia can be seen by the naked eye as small pimples covering the irregularly undu- 

 lating surface of the zoarium. The zocecia are always prostrate, but are heaped and 

 turned in various ways and are seen at various levels. 



Schizoporella incrassata, Hincks (6). 



The great variety in appearance of the zooecia in different parts of one colony is 

 quite as marked in the present specimens as it was in Htncks's, and, although 

 the variations do not always agree with his, the differences seem to belong to 

 unimportant characters. The primary orifice has, here, sometimes from 2 to 4 spines 

 on its upper margin. A large process, bearing an avicularium, is sometimes to be 

 seen on both sides of the orifice instead of on one side only. The surface of the 

 zooecium is usually grooved, the grooves radiating towards the centre. Avicularia on 

 raised processes are scattered irregularly over the zooecia. The peristome forms 

 sometimes a spinous collar, open in front, or the points of the edges of the opening 

 join and leave the opening below like an oval pore. The ocecium agrees with that of 

 Hincks's species, but that the flat plate covering its aperture is of a dead white, 

 contrasting with the glassy appearance of the rest of the zoarium. 



Localities : Gulf of Manaar ; Station XL., 10 miles off Galle, 34 fathoms. 



Mastigophora dutertrei, var. pes-anseris (Smitt, 26). 

 Locality : Station XL., 10 miles off Galle, 34 fathoms. 



Rhyncopora bispinosa, Johnston. 



The primary orifice of this species varies in one specimen from the usual shallow 

 sinus form to one with a deeper, narrower sinus, which variety has also a crenulated 

 margin as in Rhyncopora crenulata, Waters (27), a species which has, however, no 

 sinus. 



Localities : Gulf of Manaar ; and Station XL VI., off Mount Lavinia. 



