Pelagia, sp. ? 



MEDUSAE. 159 



DISCOPHORA. 



SEM^OSTOMATA. 

 Pelagia. 



There are nine very young stages, the smallest 4 inillims. in diameter and the 

 largest 8 millims. They have eight tentacles and eight sense-organs. These specimens 

 are too immature for me to identify, as they have not long passed through the Ephyra 

 stage. They are all from the Cheval Paar, Gulf of Manaar. 



RHIZOSTOMATA. 



Family : LYCHNOKHIZID^E, Maas, 1903. 



Crambessa. 



Crambessa, sp. ? 



The collection contains two specimens, both from Galle Bay, June and August ; one 

 is in fairly good condition and the other is damaged. 



Umbrella. The umbrella is semi-globular, about twice as broad as high, and 

 measures about 75 millims. in width and about 40 millims. in height. The ex-umbrella 

 looks smooth, but a close examination with a lens shows that the surface is closely 

 covered with very minute papilla?, which give it a granulated appearance. The 

 ex-umbrella of one specimen has fine markings which look like a pattern produced by 

 pressure against a tow-net. The pattern forms a network with a mesh of about half 

 a millimetre. 



Canal System. There are eight ocular canals and eight adradial canals. The 

 ocular canals run to the sense-organs, but the adradial canals stop at the circular 

 canal and do not proceed to the margin. The circular canal, which is broad and 

 conspicuous, is situated about 10 millims. from the margin of the umbrella. Between 

 the circular canal and the margin of the umbrella the canal system forms a network 

 of fine meshes. The ocular canals pass through this network and anastomose with it. 

 On the inner side of the circular canal and between the radial canals there is a very 

 coarse network of canals. This network is in communication with the circular canal, 

 but not with the stomach. In one specimen there is a slight anastomosis of the inner 

 network with some of the radial canals, but in the other specimen there is no union. 



Margin of the Umbrella. Some of the velar lobes are about as long as broad, 

 somewhat quadrangular in shape, with rounded corners, and some are narrow and 

 more pointed. There are about eight velar lobes between every two ocular lobes. 



