HYDROMEDUSAE 291 



In both of the northern species the large apical crown is rounded at the top, never 

 pointed as in almost all specimens of H. intermedius. 



Hartlaub (1905, p. 528, and 1914, p. 303) is inclined to think that ''Tiara inter- 

 media'' Browne is identical with Leuckartiara octotia, because the hydroid of this latter, 

 Perigonimus repens, occurs at Tierra del Fuego and has also been found at the Falkland 

 Islands. The investigation of the adult medusa shows, however, that it belongs to 

 Halitholus and not to Leuckartiara. On the other hand the Perigonimus described by 

 Hartlaub (1905) may not be P. repens, but another species of Perigonimus, possibly the 

 hydroid of Halitholus intermedius. 



LEPTOMEDUSAE 



Family LAODICEIDAE 



Genus Laodicea Lesson (1843) 



Generic characters. Laodiceidae with a central stomach and mouth ; with simply 



folded gonads on the four radial canals; with ocelli on the adaxial side of the basal 



bulbs of some or all of the tentacles. 



The species belonging to this genus have been revised by Browne (1907), Mayer 

 (1910), and Kramp (1919). 



Laodicea pulchra Browne 1902 (Plate XVI, figs. 3-5). 



Laodice pulchra Browne, 1902, p. 280. 

 Laodice pulchra Browne, 1907, p. 466. 

 Laodicea pulchra Mayer, 1910, p. 205. 

 Laodicea pulchra Kramp, 1919, p. 24. 



Specific characters. Adult: Umbrella flatly curved, nearly twice as broad as high. 

 Stomach very large, with four large perradial lobes extending nearly to the margin of 

 the umbrella. Mouth with four large, slightly folded lips. Gonads extending from near 

 the centre of the stomach to within a short distance of the ring canal, forming a series 

 of short folds along the lobes of the stomach, where these are attached to the sub- 

 umbrella. Tentacles about fifty, without a basal spur. Cirri absent. Sensory clubs 

 (cordyli) generally three or four between every two tentacles, and each situated on a 

 small bulb. Adaxial ocellus usually present at the base of every bulb with a tentacle or 

 a cordylus. Colour: Stomach, gonads, and basal bulbs of tentacles of a pale yellowish 

 colour (specimens in formalin). Ocelli black. Size: Umbrella 25 mm. in width and 

 15 mm. in height (largest specimen). 



The collection contains five specimens, captured in Stanley Harbour on 10 and 

 II November 1898; they belong to the intermediate and adult stages, the smallest 

 specimen being 6 mm. in width and 5 mm. in height. 



In the smallest specimen the umbrella is semiglobular and about as broad as high. 

 The umbrella, as it grows, broadens and becomes flatter, so that in the large adult it is 

 like a deep watch-glass in shape, being nearly twice as broad as high. In the smallest 

 specimen the four lips of the mouth have a smooth edge, and the lobes of the stomach 



