﻿Study of the Animal Ecology of the Shore. 235 



B. With fresh water. ^ 



i. On Enteromorpha intestinalis. 



Psammoryctes sp. Young (Oligochset). 

 Chironomus spp. 



ZONE 1— UPPER HALF. 



A. Without fresh water. 

 1. Upper Surface of Stones. 



! Littorina obtusata (L.). Yery few. 

 j rudis (Maton). Yery few. 



, Molgus (Bdella) littoralis (L.). 



I Limosina zosterae, Hal. 



B. Where fresh water percolates. 



i. Under Stones. 



! Actinia equina, L. 



I Procerodes {Gunda) ulvce ^ (Oersted), and cocoons (Turbellarian). 

 Psammoryctes costatus (Clap.).^ 



I Enchytrseidse. 

 Spirorbis borealis, Daudin. 



II Littorina rudis (Maton). Yery common ; lying deep. 

 Balanus balanoides (L.). Scarce. 



j Gammarus locusta (L.). 

 '' Jeer a albifrons, Leach. 



' Ligia oceanica (L.). Young individuals; common; one adult, 



dead. 

 ' Halacarus sp. 



ii. On Enteromorpha intestinalis. 



i Procerodes ulvcie (Oersted), 

 j Psammoryctes sp. Immature. 



Enchytrseids. Yarious. 

 \ Spirorbis borealis., Daudin. Dead shell. 



^ Specimens of Gammarus locusta (L.), were taken here on 28th November 

 1908, swimming in perfectly fresh water. 



2 See Bohmig, L., Zeitschr.f. Wiss. Zool., Ixxxi. (1906), p. 348, " Tricladen 

 Studien I." The above species has been previously recorded, for the Clyde, 

 by L. von Grafif. 



^ See W. B. Benham, Quart. Journ. Micr. Sci., xxxiii. (1892), pp. 187-218, 

 with plates v. -vii. 



