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 MARINE ZOOLOGY No. Name Estuaries of Orwell and Stour River Colne River Black- water River Crouch Other localities f>ni NUDIBRANCHIATA 5 614 6 3 S 636 648 658 Cratena ( = Eolis) concinna (Alder and Hancock) Facelina( = Eolis) coronata, Forbes and Goodsir drummondi, Thomson. . . Doto coronata (Gmelin). . . Archidoris ( = Doris) tuberculata (Cuvier) 2

5 5 5 5 5 674 Acanthodoris ( = Doris) pilosa (Mall ) 4 5 700 707 710 Alexia ( = Melampus) denticulata van myosotis (Drap.). . . CEPHALOPODA Loligo forbesi (Steenstrup). Sepia officinalis, L 10 IO I 5 Foulness (8) Petricola pholadiformis .... [A North American species ; has been introduced recently, and is spreading both here and on the North Kent coast]

~ 12 IX. POLYZOA 1. Gemellaria loricata. Linn. Brightlingsea (H.W.U.), Harwich (G.P.H.). 2. Scrupocellaria reptans, Linn. Harwich (G.P.H.). 3. Bicellaria ciliata, Linn. Brightlingsea, Orwell. 4. Bugula plumosa, Pallas. Brightlingsea. 5. Notamia tursaria, Linn. Brightlingsea. 6. Flustra foliacea. Linn. Met with in the open water, but not common. 7. Flustra papyracea. Ell. & Sol. Harwich (G.P.H.). 8. Membranipora lacroixii, Audouin. Common on old mussel shells, etc. Orwell, Brightlingsea. The larva Cyphonantes is abundant. 9. Membranipora pilosa y Linn. Brightlingsea (H.W.U.), Harwich (G.P.H.). 86 10. Membraniporella melo/antba, Busk. Dredged in the Orwell (Harmcr). 1 1 . Schizoporella linearis, Hassall. Brightlingsea. 12. Crisia eburnea, Linn. Often growing on other forms, especially Hydrallmania falcata and Flustra foliacea, Brightlingsea (H. W. Unthank). 13. Alcyonidium ge/atinosum, Linn. So extremely abundant in some of the estuaries that the bottom must to a large extent be covered by it. By the local fisher- men it is called 'pipe-weed.' 14. Alcyonidium mytili, Dalzell. A whitish or yellowish incrustation on stones and shells. Brightlingsea (H.W.U.). 15. Alcyonidium birsutum, Fleming. 1 6. Flustrella bispida, Fabr. 17. Vesicularia spinosa, Linn. Common ; Brightlingsea, Orwell. 1 8. Amathia lendigera, Linn. Brightlingsea (H.W.U.), Harwich (G.P.H.). 1 9. Bowerbankia pustulosa, Solander.