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 A HISTORY OF ESSEX 8. Nephthys cteca (Fabr.). Much larger than the above and not so common, but occurs in sandy mud at the mouth of the Colne and off Harwich. 9. Phyllodoce maculata (?) (Johnston). Only one specimen has been found, which occurred in the sandy mud at low water off Harwich. 10. Glycera capitata(l) (Oerst.). Apparently rare in the Essex district since I have found only two specimens which oc- curred in the mud of the Crouch at Burnham and corresponded with the figures given at plate xvb of the Brit. Mus. Catalogue (1865). 1 1 . Syllis armillaris (Mull.). Possibly not uncommon but easily over- looked from being so small. It is interesting from the manner in which it divides into two or more individuals. 12. Goniada maculata (?) (Grube). Only one specimen was found in the sandy mud near the mouth of the Colne. It seems to agree with the description in the Brit. Mus. Catalogue (1865). 13. Nerine foliosa (Aud. & M. Edw.). Occurs in the sandy mud near the mouth of the Colne near low water, but it is almost impossible to obtain perfect specimens. 14. Nerine cirratulus (Delle Chiaje). Common in sandy gravel near Mersea stones much above low water mark. 15. Scoloplos armiger (O. F. Muller). Occurs in considerable numbers in gravelly sand at the mouth of the Colne. 1 6. Cirratulus cirratus (Malmgren). Found in sandy mud near low water mark at the mouth of the Colne, but not common, and the specimens small. 17. Flabelligera affinis (Sars). Though all my specimens have been ob- tained in the Orwell, yet when floating as it often does in the tide it must have sometimes passed into Essex. 1 8. Notomastus latericeus (Sars). Occurs in sandy mud near the mouth of the Colne and off Harwich. 19. Arenicola marina, Linn. This is very abundant in sandy gravel near the mouth of the Colne and off Harwich, and dug extensively for bait. 20. Lanice conchi/ega, Pall. I have found this over nearly the whole district. It occurs in large numbers on the east side of the Colne below Brightlingsea near low water mark. 21. Amphitrite Johnston! (Holmgren). Common in particular places in sandy mud near the mouth of the Colne. 22. Nicolea zostericola, Orst. This used to be very common in the Orwell just outside Essex, but was not found in 1901. 23. Polycirrus aurantiacus, Grube. This is common at the mouth of the Colne in sandy gravel at about half-tide level, but only in restricted areas, where it occurs along with Phascolosoma. It seems surprising that such a long tender animal can move about in such coarse rough material. 24. Melinna cristata, Sars. Occurs in the sandy mud near the mouth of the Colne, but all the specimens found were of small size. 25. Pectinaria belgica, Pallas. I have never found this alive, but empty tubes are common off Mersea. 26. Terebe Hides strcemii. This interesting species, of which only one specimen had been found in British waters, over a hundred years ago, in Scotland, used to be fairly common in the Orwell near Pin Mill, a few miles outside Essex, but was rare in 1901. 27. Sabellaria spinulosa, Leuck. I have dredged this off Harwich and off the Colne, and it must be common in many other places in the more open water but not in the estuaries. It builds the sandy tubes locally called ross, 28. Sabella pavonina, Sav. This is more or less common over the whole district and occurs in enormous num- bers along the east side of the Colne above Brightlingsea Creek at the level of low water. Some years ago I found in that district a con- siderable number of what was either a dwarfed variety or a somewhat different species not met with lately. II. GEPHYREA I. Phascolosoma, sp. I have never found this except in one small tract of sandy gravel at about half-tide level 80