150 CEYLON PEARL OYSTER REPORT. 



of the basal part of the tentacle to the ex-umbrella varies in length according to the 

 age of the tentacle. It proceeds furthest up the umbrella in the oldest tentacles and 

 less far in the other tentacles, showing well the arrangement of the tentacles in 

 groups. There is a semi-globular basal bulb on the inner side of each tentacle, and 

 for a short distance the base of the tentacle is attached on its outer side to the margin 

 of the ex-umbrella, being partly embedded in a groove. The tentacles are covered 

 with nematocysts, which are arranged in transverse bands. The adhesive disc is on 

 the outer side of the tentacle, forming a slightly raised elongated loop, and as it 

 extends about half-way across the tentacle it is easily seen. All the tentacles of this 

 specimen are contracted, and in this condition the adhesive disc is about half-way 

 down the tentacle. 



The sense-organs are inside the margin of the umbrella, adjacent to the circular 

 canal, and their position is between the groups of tentacles. 



Olindias, F. Muller, 1861. 

 Olindias, sp. ? 



There is only one specimen, which is in bad condition. The umbrella is about 

 6 millims. in diameter. The stomach is fairly large and cross-shaped. The mouth 

 has four lips and its margin is slightly folded. Four perradial canals, and about three 

 centripetal canals in each quadrant. The gonads extend over the outer half of the 

 radial canals and are arranged in papilliform clusters. The margin of the umbrella is 

 torn and damaged. There are two kinds of tentacles ; the primary tentacles have a 

 few spiral bands of nematocysts and a horseshoe-shaped terminal cluster, the secondary 

 tentacles have numerous bands of nematocysts. Upon the margin of the umbrella 

 there are a number of large bulbs which look like the basal bulbs of the secondary 

 tentacles which have been broken off, and also a number of small bulbs. An internal 

 sense-organ lies at the base of some of the primary tentacles, but this could only be 

 seen here and there, owing to the opaqueness and damaged condition of the margin. 



The specimen may be Olindias singularis, found at the Maldives, but it is not in a 

 condition suitable for an accurate determination of the species. It was found amongst 

 sea- weed at Galle, on February 17. 



Note on the Olindiidse. 



In my Report on the Hydromedusse of the Maldive Islands I revised the genera of 

 the Olindiidse. but did not know till too late that Professor Seitaro Goto had 

 published a paper on " The Craspedote medusa Olindias and some of its Natural 

 Mlies " in the ' Mark Anniversary Volume.' It was not until several months after 

 the publication of my paper that I was able to obtain a copy of the volume, and later 

 on Professor Goto kindly sent me a reprint of his paper. 



Goto has also revised the Olindiidse, but excludes from the family the genera 



