MEDUSAE. 155 



also over a part of the lower wall of the stomach, forming a continuous ring round 

 the lower wall of the stomach just like the genital ring of a Solmaris. One 

 specimen has the outer half of the lower wall of the stomach covered with ova, 

 which are large and clearly visible ; other specimens have only one quarter or one 

 third of the wall of the stomach occupied with gonads. It appears from the specimens 

 that the gonads first start developing at the bottom of the pouches, and then spread 

 upwards and finally reach the lower wall of the stomach. The smallest specimens 

 have the gonads confined to the pouches, but it is only in the largest specimens that 

 the tronads are on the wall of the stomach. 



Tentacles. My figure of Solmundella in the Maldive Report shows that the base 

 or root of the tentacles is curved outwards towards the ex-umbrella. This I now find 

 is not the normal position, but the position occasionally taken when a specimen is in 

 a contracted condition. As a rule the root of the tentacle points towards the centre 

 of the umbrella (fig. 6), and in specimens which do not show signs of contraction it 

 is sometimes clear of the upper wall of the stomach and the curve is scarcely visible. 

 The tentacles have numerous internal transverse septa (fig. 5) which are connected 

 in the centre by an elongated endoderm cell, containing usually two nuclei. The 

 lower part of the tentacle (fig. 4) is somewhat triangular in shape ; along this portion 

 there is a longitudinal muscle band. 



Sense-organs. The smaller specimens have two sense-organs and the largest ones 

 three and perhaps more in each octant. In certain octants I have seen extra bulbs 

 without sense-organs, and these may be the bases of sense-organs which have lost the 

 otolithic part through injury. 



A few of the specimens are infested with a Cercaria. 



SIPHONOPHORA. 



Order : CALYCOPHOJLE, Leuckart. 



Family : DIPHYID^E, Eschscholtz, 1829. 



Diphyes, Guvier, 1817. 



Diphyes chamissonis, Huxley, 1859. 



Diphyes chamissonis, Huxley (1859, p. 36, pi. i., fig. 3) ; Browne ^1904, p. 742, pi. liv., fig. 6). 



The collection contains eleven anterior nectophores, some of which are in very good 

 condition. The specimens are similar to those which were described and figured by 

 me in the ' Report on the Hydromedusae of the Maldive Islands.' 



One specimen is from Galle, in July, but all the rest were from the Gulf of Manaar, 

 mostly in February and March. 



The nectophores measure about 8 millims. to 11 millims. in length. The somatocyst 



x 2 



