TURBELLARIA OF PLYMOUTH SOUND. 33 
colour-varieties of Leptoplana tremellaris, specimens of Aphanostoma 
diversicolor, Convoluta paradoxa, Plagiostoma girardi (at low spring- 
tides), and an example of what appears to be Fovia affinis (a marine 
Triclad). In the tufts of matted Florides which hang from the under 
surface of rocks, Cylindrostoma quadrioculatum occurs in hundreds. 
Tow-netting in the narrow creeks that run in between the rocks pro- 
duced young specimens of Leptoplana tremellaris, Convoluta para- 
doxa, Plagiostoma vittatum, and Oylindrostoma inerme. Working the 
Laminaria-fronds by a hand-net from the stern of the “ Anton Dohrn ” 
did not, however, add anything of interest. 
There can be no doubt that many forms have been overlooked, and 
that if examined earlier in the year, Turbellaria differing from those 
occurring during the summer might be found. The following is a 
list of the species hitherto recorded : 
Polycladida, Leptoplana tremellaris. 
Tricladida, Fovia afinis. 
Rhabdoceelida. 
Ac@La, Proporus venenosus, Monoporus rubropunctatus, Aphano- 
stoma diversicolor, Convoluta paradowxa, CO. flavibacillum. 
Raaspocara, Promesostoma marmoratum, Acrorhynchus cale- 
donicus, Macrorhynchus naegelii, Hyporhynchus armatus, 
Provortex balticus. 
Atteocata, Plagiostoma dioicum, Pl. elongatum, Pl. vittatum, 
Pl. girardi, Enterostoma fingalianum, Cylindrostoma quadri- 
oculatum, Cyl. inerme, 
Plymouth Breakwater. 
Of the two faces of the Breakwater I have naturally paid most 
attention to the inner one, the stones and weeds of which afford good 
collecting-ground during low spring-tides. Many of the weeds on the 
inner face have, during the summer, an unhealthy, half-decayed ap- 
pearance, which is associated with the occurrence of certain Turbellaria. 
Psendorhynchus bifidus, however, which occurs typically in such a 
habitat in the Isle of Man and the east and west coasts of Scotland, has 
not yet occurred at Plymouth. Macrorhynchus naegelii and Plagio- 
stoma koreni are the characteristic forms of the Breakwater. The num- 
ber of adult examples of the former species diminished from the 
beginning of August onwards, and Mr, Garstang sent me the largest 
he could find in November, but all, without exception, were quite im- 
mature. Stones, the cavities of which were occupied by anemones, 
brought from the Breakwater and kept for some time (six weeks to two 
NEW SERIES.—VOL, III, NO. I. 3 
