THE MEDUSA. 



179 



SOLMTJNDELLA Sp. 



The collection contains two early stages, which are in rather bad condition. 

 Occurrences: 75 to fathoms. 34 c (1). 

 100 to fathoms. 22 « (1). 



Order SCYPHOMEDUSiE. 



Periphtlla sp. 



Two quite early stages, the larger measuring about 7 mm. in diameter. The 

 specimens are not in good condition, but the margin of the umbrella is sufficiently 

 complete for the identification of the genus. 



Occurrences: 350 to fathoms. 36 I (1). 

 400 to 300 fathoms. 21 k (1). 



Distribution. — Periphylla is one of the genera belonging to the group of deep-sea 

 medusae, and its species have a very wide geographical range. The Biscayan specimens 

 are probably early stages of Periphylla hyacinthina, Steenstrup, which occurs on the 

 European side of the Atlantic. 



Atolla bairdii, Fewkes, 1886. 



Atolla bairdii, Fewkes, 1886, p. 936, pis. 1-3; Vaulioffen, 1892, p. 16, Taf. 4; Vanhoffen, 1902, p. 9; 

 Maas, 1904, p. 49, pis. 4-5. 



The collection contains one specimen, which has the margin of the umbrella in fairly 

 good condition, but the gonads, stomach, and mouth are mutilated. 



The iimbrella is about 40 mm. in diameter. Upon the central disc of the umbrella 

 there are radial furrows which are visible when the specimen is lifted out of formalin. 

 The presence of radial furrows is one of the characters for distinguishing Atolla verrillii 

 from Atolla bairdii; but as Maas has found indications of furrows on the central disc of 

 Atolla bairdii, I think that I shall not go far wrong in regarding the specimen as Atolla 

 bairdii. There are 21 tentacles and 21 sense-organs. The shape of the pedalia and the 

 marginal lobes resemble the figures by Maas of Atolla bairdii. 



Occurrence: 1500 to 750 fathoms. 30a (1). 



Distribution. — Atolla bairdii occurs on the western side of the North Atlantic, off the 

 coast of North America ; and on the eastern side from the Bay of Biscay nearly to the 

 Equator. It is a deep-sea medusa, and has been usually taken below 500 fathoms and 

 below the temperature of 50° E. 



Pelagia ? Ei)h\jra stage. 



Three specimens of very early Ephyru stages, which I am not able to identify with 

 certainty. 



Occurrences : Surface. 21 i, 23 e. 



25 to fathoms. 30 m. 



