34 
MARINE FAUNA OF ST. ANDREWS. 
Class CTENOPHORiE. 
Two representatives only are found at St. Andrews, viz. a 
species of Beroid and a Pleurobrachia. The former occurs in 
vast swarms in July, indeed almost as plentifully as in the 
Zetlandic seas, and is easily procured by the hand-net from 
the rocks or at sea. The latter is equally abundant from 
August to the end of autumn, and even in winter, occasionally 
filling the towing-net or the dredge in the bay, and thrown 
ashore after storms on the West Sands. Few objects are more 
engaging than one of these spherical jellies in a clear glass 
vessel of sufficient size to exhibit the matchless mechanism of 
of its complex tentacles and the splendid iridescence of its 
locomotive rows. 
Order Saccate, Agassiz. 
Genus Pleurobrachia, Flem. 
Pleurobrachia jyileus , E schsch. 
Abundant. It eagerly devours Cardnus mamas in the 
zoea-stage. 
Pleurobrachia piletts, swimming downwards after engulfing a zoea. 
Order Beroid^e, Ggbr. 
Genus Idyia, Freminville. 
Idyia cucumis , 0. Fabr. 
Occasionally in large numbers in July and August. 
