108 Mr. Patterson on the Cydippe Pomiformis. 



of Dublin, outside of Kingstown Harbour,* and at Lambay Island, by Mr. 

 Thompson and Mr. Ball, and by the latter gentleman at Youghal. 



In conclusion it may be remarked, that the species now described combines 

 the characters in Fleming's definition of the genus Beroe : " body with vertical 

 ciliated ribs ; tubular vessels traverse the axis of the body with lateral and termi- 

 nal apertures ;" and those in his genus Pleuro-brachia, " body sub-orbicular, with 

 eight ciliated ribs and two ciliated arms, one on each side." 



As it seems desirable to place under our view the distinctive characters of 

 C. Pileus and Pomiformis, as detailed in the present paper, I subjoin a brief 

 definition of each. They are the only British species at present referrible to the 

 genus Cydippe of Eschscholtz. 



C. Pileus.-^Tentacula issuing near the mouth ; cilia fin-like, with slightly 

 rounded outline ; ovaries crimson ; nervous system, whitish cords, and ganglia. 



C. Pomiformis. — Tentacula issuing near the anus; cilia divided; ovaries 

 colourless; nervous system inconspicuous. 



• The specimens there captured were exhibited before the Natural Histor}' Section of the Bri- 

 tish Association in Dublin. — See 4th vol. of Reports, p. 72. 



I am informed by Mr. Ball, that Mr. Bergin of Dublin has preserved some of these animals in a 

 solution of acetate of alumina for fifteen months. In alcohol they have generally fallen to pieces in 

 the course of a few weeks, or become so contracted as to be valueless as specimens. 



