466 Prof. M'Intosli's Notes from the 



the specimens found at St. Andrews, so that it is unnecessary 

 to repeat it. The contractile filaments, however, in con- 

 nexion with the principal lobes are much more 

 distinct than he figures them, and theconcretions 

 in thectenocyst are minutely botryoidal or forma 

 crystalline coarsely granular mass (see woodcut) , 

 and are perfectly colourless, instead of being red- 

 dish, as in the Mediterranean form. There are Concretion in 

 tinted granules (pinkish), however, at the bases ^ enocyt, . 

 of the water-vessels. It is also worthy of note that in July and 

 August certain examples showed a much larger development 

 of the principal lobes at the sides of the mouth than had been 

 observed earlier in the season. They projected like two large 

 flaps at the sides of the aperture, approaching in this respect 

 the EuramphcBa of Gegenbaur {Mnemia of M. Sars *). The 

 species has since been found at Nice by Verany and at Naples 

 by Sars and Spagnolini f. 



On the shores of North America (Massachusetts Bay and 

 Newport, E,. I,), again, Alex. Agassiz procured a species of 

 the same genus, and described it in 1865 along with other 

 Coelenterates. This species grows to a large size, viz, 4 inches 

 in polar diameter, and " is as transparent as Bolina and even 

 more sluggish. It is exceedingly abundant during September, 

 large numbers being visible during any clear hot day. Its phos- 

 phorescence is a very peculiar bluish light, of an exceedingly 

 pale steel-colour, but very intense " \. 



The examples at St. Andrews swam steadily in the water, 

 and more actively than Beroe, as might be expected from 

 their very powerful locomotive flappers. The mouth was 

 generally uppermost. Nothing of moment was observed in 

 the gastric chamber, and hence they formed a striking con- 

 trast with Pleurohrachia, which is so greedy that it engulfs 

 post-larval fishes, and thus it is necessary to remove the latter 

 from contact witli the Cydippes the moment the net is brought 

 on board. Like the American species, that at St. Andrews 

 was beautifully phosphorescent, the light being intense and 

 almost white. It is readily emitted by merely blowing on 

 the water, and glances brightly along the ctenophores or 

 locomotive flappers. Messrs. Pentland Smith and J , Walker, 

 who examined the light with me in May, thought it faintly 

 greenish ; but though not pure white, the tinge of greenish 

 or bluish was hardly distinguishable. 



* ' Beskrivelser og Jagttagelser &c.,' p. 32, pi. vii. fig. 16. 

 t Fide ' Prodromus Faunae Mediterranese,' i. p. 55. 

 X ' North-American Acalephse,' p. 24. 



