MARINE BIOLOGICAL STATION AT PORT ERIN. 49 



plaice in Luce Bay, which, were eventually transferred to the 

 tanks at Piel. After a day or two a quantity of regurgitated 

 empty shells of Scrobicularia began to appear at the bottom 

 of the tanks. When the debris was removed one nearly com- 

 plete and two partially digested specimens of Priapulus were 

 found. The best specimen was preserved and sent to Liverpool. 

 No further specimens resulted from the visit to Luce Bay 

 in 1920, although a careful lookout was kept. Adult plaice 

 from Luce Bay were landed at the end of September, 1921. 

 Almost at once after they were put in the tanks, a very fine 

 specimen of Priapulus was regurgitated by one of the fish. 

 There were slight indications that the Gephyrean was not 

 quite dead, but it did not recover. It was preserved as a 

 museum specimen. One can safely conclude that Priapulus 

 caudatus is an inhabitant of the sandy bottom of Luce Bay. 



A. Scott. 

 (5) Various Nudibranchs. 



Archidoris tuberculata, Cuv., Polycera quadrilineata, 

 O.F.M., Dendronotus arborescens, O.F.M., Facelina drummondi, 

 Thomp., and Fiona marina, Forbes. These five species of 

 Nudibranchiata are occasionally found in the spring on the 

 shore at low water on the west side of Roa Island ferry pier. 

 The Archidoris and the Facelina are moderately common, but 

 the others appear to be rare. Four specimens of Fiona were 

 found in the crevices of the wood of the ferry pier in May, 1921 . 

 The Archidoris, Polycera and Facelina live amongst the algae 

 and under the stones. Although Polycera was rare on the 

 Roa Island shore at the same time, it was occurring in immense 

 numbers on the Halidrys and Laminaria on Piel Island shore, 

 near the colony of Cerianthus. The ebbtide left the swarm of 

 Polycera stranded, and as it rose again they floated off adhering 

 to the surface film of the water. Twenty to forty specimens 

 at a time could be scooped up by hand. These five species of 

 Nudibranchiata apparently only came into the shallow water 



