38 TURBELLARIA OF PLYMOUTH SOUND. 
Millbay Channel. 
This channel (varying in depth from 18 to 21 fathoms) is a recognised 
locality for certain animals, and I have found some species of 
Turbellaria peculiar to it. The allceoccelous fauna of this channel and 
the Hamoaze present an interesting species of the genus Automolos, 
apparently connecting the Allceoccela with the Tricladida. More 
observations are however needed, and an examination of these two 
localities will probably forward the solution of this problem. 
Species of Cylindrostoma and Enterostoma make up the bulk of the 
fauna. A specimen of what I take to be Plagiostoma siphonophorum 
(if confirmed) will prove to be another Adriatic form added to the 
Plymouth fauna. 
Polycladida, Leptoplana tremellaris (abundant), Oligocladus san- 
guinolentus, Stylostomum variabile (young stages, °5—1 mm., 
are not uncommon in September). 
Rhabdoceelida. 
Ruaspoce@.a, Promesostoma solea. 
AuL@ocara, Plagiostoma siphonophorum (2), Pl. girardt, 
Enterostoma fingalianum, EH. austriacum, Automolos ophioce- 
phalus. 
SYSTEMATIC LIST OF THE TURBELLARIA.* 
TURBELLARIA. 
Sub-order 1.-_RHABDOCELIDA. 
A, ACGHLA. 
Family PROPORIDA. 
Genus 1.—PRoporus. 
1, PRoporus venENnosus (O. Schmidt). 
This species is readily distinguished from all other Accela by its 
elongate form, yellow colour, and large eyes. It is not uncommon at 
the base of the littoral zone at Wembury Bay and Drake’s Island. 
* A key for the determination of genera and species may be found in my “ British 
Marine Turbellaria,” loc. cit., pp. 514—522. 
