TURBELLARIA OF PLYMOUTH SOUND. 37 
of the Sound cannot yet be made justly, as my investigations are 
not yet sufficiently complete. The Turbellaria appear to resemble 
those of the Breakwater, as a comparison of the accompanying tables 
tends to show. Specially interesting forms are Aphanostoma elegans, 
hitherto recorded from Bergen, and Plagiostoma sagitta, found by 
Uljanin in the Bay of Sebastopol. The occurrence of species from 
such widely distant localities shows how much still remains to be 
done before we can determine the geographical distribution of the 
species of this group. 
The following list of species were taken at low water round Redding 
Point and northwards : 
Polycladida, Stylostomum variabile (‘75 mm. long). 
Rhabdoceelida. 
Aceta, Convoluta paradowa, Aphanostoma elegans. 
Raaspocera, Microstoma grenlandicum, Promesostoma mar- 
moratum, Pr. solea, Acrorhynchus caledonicus, Macrorhynchus 
naegelvi, Hyporhynchus armatus, Provortex balticus. 
Auta@oce@ta, Plagiostoma vittatum, Pl. koreni, Pl. sagitta, Vor- 
ticeros auriculatum, Monotus lineatus, M. fuscus. 
East Side of the Sound. 
Under this heading I include the rocks below the Laboratory, Rum 
Bay, Batten Bay, and Bovisand Bay. As regards the Turbellaria of 
the first three there is little to be said. The same causes that have 
impoverished the flora and fauna probably account for the poor 
result in this group. Repeated attempts only resulted in Convoluta 
paradoxa, Plagiostoma vittatum, Vorticeros auriculatum, and Monotus 
fuscus. The last also occurs on the rocks below the ladies’ bathing- 
place. In Bovisand Bay the tide-pools yielded Convoluta paradoxa 
and CO. flavibacilluin, 
The Hamoaze. 
A portion of this locality was explored by the help of the “ Firefly.” 
The stones and débris that are brought up are covered with the mud- 
tubes of Polydora ceca, tenanted, however, by an Amphipod, Coro- 
phium Bonellii, The great abundance of this Crustacean possibly in 
part accounts for the limited Turbellarian fauna. 
Polycladida, Leptoplana tremellaris. 
Rhabdocelida. 
AtL@ocata, Plagiostoma pseudomaculatum, Oylindrostoma 
imerme, Automolos (?) ophiocephalus, Aut. horridus. 
