218 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



with conspicuous red brain. This species is very abundant 

 in the shingle under Ulva-covered stones, a short distance" 

 from the Laboratory, and is generally associated with 

 Linens obscurits and the Oligochaete Glitellio arenarius. 

 On being placed in a dish of sea-water with some sand 

 and shingle, A. lactifloreus forms a sandy mucous tube 

 which lies on the top of the shingle. Mr. Beaumont 

 also found this species under stones on the limestone reefs 

 at Poyllvaaish in Bay-ny-Carrickey. 



AmjphipoTus pidclier {.^), O.^.M.Vi\\QY. Oersted. 



A specimen about IJ inch long dredged in 10 fathoms, 

 S.E of Kitterland (between Spanish Head and the 

 Burrow), on April 1st, 1893, was doubtfully referred at the 

 time to this species.* 



Family Tetrastemmid^, Hubrecht. 



Tetrastemma dorsale, Abildgaard. 



Average length 3 cm. Colour brown, with yellow 

 median dorsal line and transverse bands. Found in the 

 laminarian zone on the destroyed breakwater and on the 

 north side of the Bay. The easily recognised reddish 

 brown speckled variety of this species occurred plentifully 

 last year in dishes containing material dredged in the 

 vicinity of Port Erin. 



Tetrastemma nigrum, Riches. 



Average length 9 mm. Found on Codium in a mid-tide 

 pool at Traie Veg, Port Erin Bay. The body is rounded, 

 and the head, in this species, not well defined. The 

 colour on the ventral surface is yellow, while the dorsal 

 surface is quite black. 



* In tlie absence of information as to the structure of the proboscis and 

 the position of the side organs of this specimen it is impossible to determine 

 whether it should be referred to Arniihiiyorus indclicr, or to the recently 

 described species Amphiporus dissiiiiulans^ Riches (Jour, of Mar. Biol. Ass., 

 Vol. II, new series, p. 10). 



