94 ' Mr. Patterson on the tydippe Pomiformis. 



instance was occasioned by his description having been drawn up from an exa- 

 mination of a single individual, " found in the Frith of Tay, in a pool left by 

 the tide." The animal was then in an exhausted state, when the tentacula would 

 naturally be retracted within the body. Dr. Fleming referred this species doubt- 

 fully to the ovata of Baster, but as they form not only distinct species, but 

 belong to different genera, it is necessary to substitute another appellation, and 

 as such I propose " Pomiformis." 



Lesson, in his paper " Sur les Beroides,"* conjectures that the Beroe de- 

 scribed by Fleming, might eventually be found, as is now the case, to belong to 

 those bearing tentacula. The words in which this idea is expressed are the fol- 

 lowing : — " Peut-etre est ce au Cydippe globuleux qu'appartient I'espece trouvee 

 par le Dr. Fleming (Mem. Soc. Wer. t. iii. p. 400,) dans le detroit de Tay, et 

 qui n'avait point de prolongemens." 



Having ascertained the identity of the Irish Beroe with that of Fleming, my 

 next object was to have such drawings and descriptions prepared as would dis- 

 tinguish it from the species I had formerly described, and which in size and 

 external appearance it precisely resembled. For this purpose I brought up with 

 me in sea-water to Belfast, three of each, and hastened to a friend, to whose 

 pencil I had been indebted on similar occasions. On my arrival it was found 

 that the white radiating vessels of the C. Pomiformis, which had been so conspi- 

 cuous when the animal was first taken, were scarcely perceptible. I took the 

 earliest opportunity of procuring a further supply, but found that at the end of 

 a few hours these distinguishing whitish coloured vessels were no longer visible. 

 Knowing, however, their situation, I examined them under a lens, and though 

 the vessels had lost their whiteness, saw in each the circulation of the fluid going 

 on as usual. I then took eleven of the Beroes, in which no apparatus of the 

 kind was conspicuous, and on subjecting them to a similar scrutiny, had the 

 satisfaction of discovering that the same structure existed in all, and consequently 

 that Dr. Fleming's Beroe, of the capture of which we have no record, save that 

 of a single individual in 1820, was identical with that which I had taken so fre- 

 quently, during successive years, at the entrance to Lame Lough. 



In bringing together, under several heads, the observations made at various 



* Annales des Sciences Naturelles, tome v. 



