312 DISCOVERY REPORTS 



the Stomach; margin crenulated, with small warts containing nematocysts. Gonads 

 surrounding the basal part of the stomach and extending over the peduncle along the 

 four perradial lobes of the stomach. Tentacles four, perradial, fairly stout and tapering 

 to a point, nematocyst clusters in the distal part of the tentacle forming distinct trans- 

 verse bands. Basal bulbs large, cylindrical, a little longer than broad. An ocellus on the 

 outer (abaxial) side at the base of each tentacle. Colour: Stomach, gonads, and basal 

 bulbs pale yellow (in formalin), ocelli reddish brown. (Radial canals, gonads, manu- 

 brium, and tentacles bright blue when alive, according to note by R. Vallentin.) 

 Size: Umbrella 25 mm. in height and 24 mm. in width (largest specimen). Vallentin 

 has seen living specimens 30 mm. in height. 



The first collection contains twelve specimens, showing the early, intermediate, and 

 adult stages; they were collected in Stanley Harbour between 11 November and 

 27 December 1898. In the second collection there are thirty-two specimens from 

 Stanley Harbour, where the species was observed from 7 November 1 901 to 21 March 

 1902. Those from November are all large, but from the beginning of January young 

 and intermediate stages as well as adults were found. VanhoflFen records this species 

 from Callao on the coast of Peru and from the Strait of Magellan. 



In the earliest stage observed (Plate XVIII, fig. 3) the umbrella is bell-shaped, i mm. 

 in height and | mm. in width. Velum broad. Stomach quadrangular, without perradial 

 lobes and not mounted on a peduncle, about one-third the length of the umbrella 

 cavity. Mouth with four short lips, scarcely visible. Gonads not developed. Tentacles 

 short and stout, with large globular or cylindrical basal bulbs. This early stage resembles 

 a little Sarsia, but is distinguished by the structure of the tentacles and basal bulbs and 

 by the quadrangular shape of the stomach. 



As the medusa grows, the manubrium increases in length and becomes tube-like ; the 

 perradial lobes appear at its base (Plate XVIII, fig. 2), and when fully developed extend 

 along the whole peduncle, but not beyond it. In the intermediate stages the length of 

 the manubrium is very variable. Soon after the lobes start to develop (when the 

 umbrella is about 2i or 3 mm. high), the peduncle begins to form. The lobes in the 

 intermediate stages are thin and narrow, but in the adult they become sac-like, their 

 distal ends hanging down into the umbrella cavity, just as in a Moerisia. When viewed 

 aborally they form a distinct perradial cross (Plate XVIII, fig. 6). In the early stages the 

 mouth is like that of Moerisia, being either round or quadrangular, the lips scarcely 

 visible. In the intermediate stages the four perradial lips are distinctly visible, but 

 scarcely exceed in width the diameter of the stomach. In the adult the lips are slightly 

 wider than the stomach and the margin is crenulated and provided with small clusters 

 of nematocysts (Plate XVIII, fig. 5). The radial canals are large and conspicuous in all 

 stages, and also the ring canal. 



The gonads occupy the lobes of the stomach and also extend about half way down the 

 manubrium. They form a continuous mass, not separated by perradial or interradial 

 grooves (Plate XVIII, fig. 6). This was seen by Vanhoffen in the South American 

 specimens examined by him, and it is confirmed by sections of Falkland specimens. 



