94 



CALYPTOBLASTEA— LEPTOMEDUS^. 



Family Thaumantiid^. 



A small number of medusae, apparently belonging to this 

 family, were obtained in the tow-net by the " Evadne " in June, 

 1912, but as they were only observed in the preserved state they 

 could not be identified with certainty. Three species were dis- 

 tinguished. 



1.* THAUMANTIA8 sp. (Plate V., la, lb.) 



One specimen in good condition (excepting for the sense 

 organs) from the Kettle (Fame Islands), June 27th, 1912. This 

 was the largest specimen, with a diameter of one inch, and with the 

 peculiarity that the mouth appeared not to have been broken 

 through. That is to say, the large stomach was produced into a 

 conical peduncle, which, instead of opening to the exterior by a 

 definite manubrium, was covered by an extremely thin membrane- 

 like layer, apparently continuous with the sub-umbrella. 



Description : Umbrella shallow, sub-umbrella much depressed. 

 Radial canals conspicuous, narrow, four in number. Gonads at 

 distal end of the radial canals, four, long. Marginal tentacles 36 

 in each quadrant, making about 144 in all, short, spirally coiled 

 and smooth. Marginal vesicles indistinguishable. Velum extremely 

 narrow. Manubrium absent ; stomach large and square, peduncle 

 conical and ending blindly. 



2.* THAUMANTIAS THOMPSONI, (?) Forbes. (Plate V., 

 2a, 26, 2c.) 



From north-east of Newbiggin, 15 fathoms, June 26th, 1912. 

 A few specimens measuring about J inch diameter. 



The umbrella shallow, sub-umbrella depressed ; four very 

 delicate radial canals ; 16 margmal tentacles roughened by rings 

 of thread-cells, sprmging from large bulbs ; marginal vehicles, 

 two on each side of the adradial tentacles, making 16 in all ; manu- 

 brium with four frilled lobes, the margm of which is conspicuous 

 (c/. the " fibrous cells " described by Forbes). 



3.* THAUMANTIAS sp. {T. hcemispkerica, Forbes ?). (Plate 

 v., 3a, 6, c and d.) 

 Two specimens from the Kettle (Fame Islands), June 27th, 

 1912, measuring half-an-inch in diameter. 



