A HISTORY OF ESSEX 



the pier at Harwich. Mounted in Canada 

 balsam specimens show the structure well, and 

 have retained the natural colour for a good 

 many years. 



12. Botrylloides leachii, Sav. 



Common in the Orwell just outside Essex, 

 and I think I have also found it in the Stour. 

 By proper management both the form and 

 natural colour may be well preserved in un- 

 diluted glycerine. 



13. Polyclinum aurantium. 



In 1889 fine specimens were common in 

 the creek east of Walton-on-Naze. Sections 

 mounted in Canada balsam show the structure 



very well, and have retained the natural 

 orange colour for many years without any 

 apparent change. 



14. Didemnum, 



15. Leptoclinum, and 



1 6. Diplosoma. 



Some species of these genera occur in the 

 Orwell, just outside Essex, and probably 

 could be found in the Stour and in the 

 creeks near Walton-on-Naze. 



17. Oikopleura, sp. 



Appendicularians are common in sievings 

 of the sea water all along the coast. 



88 



