MEDUSiB. I. 105 



In the Pacific the premis is represented h\ Tiviu saghaliiievsis Bigelow (1913, p. 35), a large 

 species, distinguished by its very short peduncle and h\ the lips being extraordinarily complexly folded. 



M a t e r i a 1 : 



I have had at my disposal for investigation numerous specimens from Danish waters, but oulv 

 4 specimens from one locality outside the Danish area: 



Lat. 5510' N., Long. i°55' E. May 3rd 1905. Depth 33 m. Voung-fish trawl. "Thor" stat. 14 I05I. 

 — 4 specimens, diameter: 35, 42, 43, and 58 mm. 



The Danish specimens have been found at 23 different localities in the North vSea, the Skager- 

 rak, the Kattegat, and the northern part of the Sound. The species has also been found in the north- 

 ern part of the Lillebelt. 



I am not going to give a thorough account of the Danish finds in this place, but shall restrict 

 myself to make some few remarks on the appearance of a number of )oung specimens. 



Most of the specimens, examined by me, are large and medium-sized, the largest being 58 mm 

 in diameter. But there are also some \oung specimens, the smallest being ii mm. The height of a 

 specimen, 6 mm wide, is 4 nun, the gelatinous substance being 2 mm thick a])icall\, and the depth of 

 the bell-cavit\' being likewise 2 mm. — The peduncle is short in these small specimens. In a specimen. 

 13 mm wide, the peduncle is 4 mm long, 3 mm wide at the base. 



When the diameter is below 13 nun only slight traces of gonads arc present, and they are 

 confined to the subumbrella part of the radial canals, ranging from the base of the peduncle \-ery 

 nearly to the circular vessel. 



Three of the specimens, which are 6, 7, and 10 mm wide, luue S tentacles, all alike; 8 adradial 

 swellings just visible indicate the places of the remaining tentacles. In two specimens,. 11 and 13 mm 

 wide, one of the adradial tentacles has developed, but is much smaller than the 8 perradial and inter- 

 radial ones. One specimen, 13 mm wide, po.ssesses 16 tentacles, the perradial and interradial all alike, 

 while the others are much smaller and in different stages of development. I have not seen specimens 

 with less than 8 tentacles, and these have always been of equal size in the same individual. The 

 number of marginal vesicles in these small .specimens (6— 13 mm) is 29—34. .\ specimen, 23 nun wide, 

 has about 84 marginal vesicles. 



One of the specimens from the above-mentioned localit\- in the western part of the North Sea 

 is abnormal, in so far as one of the four quadrants is narrower than the other.s, and there are no tent- 

 acles between the two adjacent radial canals. I have observed the same abnormality in no less than 

 3 of the Danish specimens. 



Distribution (see Chart XI\'): 



This large medusa seems to be strictly confined to the North Sea. the Skagerrak, and the 

 Kattegat. It has been recorded from Berwich Bay (Johnston 1833), May Island (Dal yell 1847—48), 

 Burtisland (Forbes 1848), and St. Andrews Bay (Forbes 1848, Mcintosh JS90. Crawford 1891); 

 all these localities are at the .southern part of the east coast of Scotland. According to Mcintosh 

 the species abounds all along the eastern shores of Great Britain to the estuary of the Thames (Mc 



The Ingolf-EspeJitimi. V. 8. '4 



