PLYMOUTH MARINE INVERTEBRATE FAUNA. 217 



[ Nemertini — contd. ] 



Amphiporus bioculatus, Mcintosh. 



One specimen dredged in Millbay Ch., 18.11.92, (t.h.r.). 



Drepanophorus spectabilis (Quatrefages). 



Among weeds dredged in Cawsand B. (one specimen); dredged 

 off Stoke Pt. (four) (t.h.r.). 



Taken several times on Mewstone Ledge ; Queen's Gd. (once) ; 

 Eddystone Gds. (w.i.B.). 



Queen's Gd.. Millbay Ch., Cawsand B. (r.a.t.) : 5 m. S. of Mew- 

 stone (a.j.s.). 



Tetrastemmidse. 



Tetrastemma ambiguum, Riches: Journ. Mar. Biol. Assoc, N.S.,iii, p. 19. 



Found Nov., 1902 (t.h.r.). 

 'Tetrastemma candidum (O. F. Miiller). 

 - T. veRxMICULAtum (Quatrefages). 

 .T. melanocephalum (Johnston). 



Until the British Tetrastemmidm have been thoroughly revised, 

 any attempt to deal with the distribution of the so-called species, 

 T. candidum, T. vcrmiculatum, and T. melanocephalum, is of doubt- 

 ful value. Nemertines recorded under each of these names have 

 been commonly dredged in Plymouth Sound, and occasionally 

 found between tide-marks and among Zostent in Cawsand B. 

 T. candidum — so-called — has also been found on the Mewstone 

 ledge, on the inner trawling grounds, where it is abundant among 

 Cellaria, and on the Eddystone Gds. But it may hereafter be found 

 that two distinct species (perhaps more) have been confused as 

 T. candidum (w.i.B.). 

 Tetrastemma cephalophorum, Biirger. 



Millbay Ch., Duke Pk. (as Frosorlioelimus Claparcdii by mistake) 

 (t.h.r.): dredged Millbay Ch., Queen's Gd., Duke Pk., P. Yealm 

 (w.i.B.). 

 Oerstedia dorsalis (Zool. Dan.). 



Very common in dredgings, especially in early summer among 

 Zostera in Cawsand B. (t.h.r.) : Queen's Gd., Millbay Ch. (r.a.t.) : 

 Asia Sh. (w.i.b., r.a.t.) : Cawsand B. (r.a.t.) : 5 m. S. of Penlee Pt. 

 (r.a.t.) : Eddystone Gds. (w.i.B., e.j.a.) : found almost everywhere 

 from shore down to 30 fms. or more — a yellow form (Biirger's var. 

 cincta) abundant among Cellariet (w.i.B.). 



Breeding in autumn (t.h.r.) : Sept., Oct., Nov. (w.G.). 

 Oerstedia nigra (Piches) : Journ. Mar. Biol. Assoc, KS., iii, p. 14. 



On Codiicm and other weeds from Laminarian zone (t.h.r.): Pum 

 B. and Batten among corallines (w.i.B.). 



Oerstedia immutabilis (Piches): Journ. Mar. Biol. Assoc N.S., iii, p. 14. 

 . Coralline pools in Wembury B., many specimens ; among weeds 

 on shore and dredged at Duke Pk. (t.h.r.). 



Malacobdellidae. 



Malacobdella grossa (0. F. Midler). 



In branchial cavity of Cyprina islandica, never more than one 

 in a mollusc (t.h.r., s.p.). 



Pipe females in autumn (t.h.r.). 



