28o DISCOVERY REPORTS 



or more tentacles. In both genera there are species which have asexual reproduction, 

 forming medusa buds upon the sides of the manubrium, and other species which do not 

 produce medusa buds. 



Podocoryne tenuis (Browne) (Plate XV, figs. 5-6). 



Dysmorphosa tenuis Browne, 1902, p. 277. 

 Podocoryne tenuis Mayer, 1910, p. 141. 

 Podocoryne tenuis Kramp, 1928, p. 47. 



Specific characters (Plate XV, fig. 5). Umbrella somewhat conical with a slight con- 

 striction above the subumbrella cavity ; a little higher than broad. Stomach cubical, and 

 on a gelatinous peduncle about as long as itself. Mouth with four lips having terminal 

 clusters of nematocysts. Medusa buds upon the stomach, interradially situated. 

 Tentacles eight. Colour: Stomach, medusa buds, and basal bulbs of tentacles pale 

 yellow (in formalin). Size: Umbrella 2 mm. in height and ij mm. in width. 



Two specimens were taken in Stanley Harbour in November 1898; from Vallentin's 

 second voyage there is only one specimen (date of capture not stated) ; the third collection 

 contains six specimens, taken in Roy Cove 23 November and i December 1909 and in 

 another locality at the Falkland Islands 19 January 1910. 



The two specimens from November and December 1909 are evidently young 

 individuals which have not yet developed medusa buds; they are only o-7-i-2 mm. high, 

 and the smallest one has very thin walls and no apical gelatinous crown. The other 

 specimens all have medusa buds upon the interradial sides of the stomach, and gonads 

 are not visible. Some of these specimens have only four medusa buds placed in one 

 whorl, but in three specimens from January 19 10 four minute medusa buds are seen 

 forming a second whorl below the four large buds. 



In most specimens the umbrella has a solid mass of jelly above the umbrella cavity. 

 The velum is fairly broad. The tentacles on the margin of the umbrella are of equal size 

 and have small basal bulbs. 



The mouth, when contracted, has four short lips, each of which has a large cluster of 

 nematocysts; the stomach cavity is cross-shaped, and a narrow groove proceeds along 

 the inner side of the lips. When expanded the mouth is quadrangular (Plate XV, fig. 6), 

 and the clusters of nematocysts are clearly visible in the four corners. 



Other species of Podocoryne with medusa buds are (i) P. minima (Trinci, 1903) from 

 Naples, a very small medusa, 0-27-0-33 mm. high, with only four marginal tentacles; 

 (ii) P. simplex Kramp (1928) about 0-75 mm. high and likewise with only four tentacles, 

 two of which are much smaller than the others; (iii) P. meteoris Thiel (1938) from Cape 

 Verde with eight marginal and twelve oral tentacles; it is most probably a Lizzia; 

 (iv) Podocorytie minuta Mayer (1900) from Florida (Mayer, 1900, p. 41, pi. 18, fig. 42) 

 and from Great Fishbay on the west coast of Africa (Thiel, 1938, p. 298) [records of the 

 same species from the Mediterranean (Trinci, 1904; Neppi and Stiasny, 1913) are 

 doubtful]. P. minuta bears a great resemblance to P. tenuis, and it is possible that the 

 two species are identical; P. minuta is, however, much smaller, only 0-3 mm. high. 



