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 MARINE ZOOLOGY No. Name Estuaries of Orwell and Stour River Colne River Black- water River Crouch Other localities 21 C Pholas dactylus L. .. 7. IO Foulness (8 9) 216 221 222 Barnea ( = Pholas) Candida (L.). Teredo norvegica, Spengler navalis, L 4 /> * 10 9 I 3 c 227 fiinbriata, JefF. Clacton (8) 239 265 274. Thraciafragilis,Penn.(= papyracea) SCAPHOPODA Dentalium entalis, L GASTROPODA Patella vulgata, L. ....

I I 3 3 2 9 5 296 207 Gibbula ( = Trochus) majus (L.). - tumida (Montagu) .... - cineraria (L.) 2 A. 8,9 I I fT. cinereus, y/ 298 305 - ( = Trochus)umbilicata(Mont.) Calliostoma ( = Trochus) zizyphi- nus (L.} . IO I (Foulness (8) Walton (8, n) 324 326 327 328 77O Lacuna crassior (Montagu). . - parva (Da Costa) ( = puteolus) - pallidula (Da Costa). . . Littorina obtusata (L.) .... rudis (Maton) 4 2. 4. 6 8 6 IO 6 i i 5 JJ" > 771 v. tenebrosa, Mont. . . - littorea (L.) .... 2 IO i
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Foulness (8) Foulness (8) Jj' - littoralis IO

Foulness (8) 346 Zippora ( = Rissoa) membranacea, v. labiosa, Mont. ( = membra- nacea) 6 8,0 i 359 37' Paludestrina ( = Hydrobia) stagna- lis (Baster), ( = ulvse). . . Truncatella truncata (Mont.). subcylindrica 4 6,8 6 8,9 i

Foulness (8) 374 38' 389 454 Crepidula (fornicata, L.). . . Natica catena (Da Costa). . . Velutina laevigata (Penn.). . . Turbonilla ( = Odostomia) lactea (L.).

6, 10 i IO 3 5 Foulness (8) 489 495 508 5'5 518 5i9 53' 553 554 572 580 Buccinum undatum, L. Neptunea ( = Fusus) antiqua (L.). Ocinebra ( = Murex) erinacea (L.) Purpura lapillus (L.) .... Nassa reticulata (L.) .... incrassata (Strom.) .... Bela ( = Pleurotoma) rufa (Mont.) Tornatina ( = Utriculus and Cyli- chna truncatula (Bruguiere) . obtusata (Mont.) .... OPISTHOBRANCHIA Accra bullata, Mailer .... Philine aperta (L.) 2,4 4 4 2,4 2 A. 8, 10 10 IO 6 IO i i 3 3 3 3 Walton (8) Walton (8) Foulness (8) /C. truncata, Foulness (8) Foulness (8) 85
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