34 TURBELLARIA OF PLYMOUTH SOUND. 
months) in the Laboratory, produced a number of Plagiostoma 
vittatum and Pl. koreni. The pyriform stalked egg-capsules of the 
former were deposited in numbers in August. These and other 
species have the habit of creeping about under a covering of diatom- 
deposit which encrusts stones, weeds, &c. Protected in this way 
they are extremely difficult to find. 
My method of examining the Breakwater was chiefly the use of a 
hand-net, which was worked vigorously among the weeds at low 
water from the dinghy. By this means the following fauna were 
obtained : 
Polycladida, Leptoplana tremellaris (adult and young). 
Rhabdocelida. 
Aca@ia, Aphanostoma diversicolor. 
Ruaspocara, Macrorhynchus naegelii, Mesostoma (?) neapoli- 
tanum. 
Att@ocaia, Plagiostoma elongatum, Pl. koreni, Pl. vittatum, 
Vorticeros auriculatum and V. luteum, Allostoma pallidum, 
Monotus lineatus. 
Cawsand Bay. 
There are here two distinct collecting-grounds—the rocks and 
tide-pools exposed at low water on the north side of the bay towards 
Picklecombe Fort, and the beds of Zostera that grow on the sandy 
bottom. In the former locality Acrorhynchus caledonicus is the 
prevailing species, as Hyporhynchus armatus is the chief feature of 
the Zostera bed. It was only toward the end of my visit that I 
discovered the tiny Rhabdoceeles among the Crustacea and Nemertea 
which occur in great quantity in the Zostera, so that many forms 
will probably be added by a re-examination of the dredgings taken 
among the rich weedy ground indicated by Prof. Johnson (the 
Journal [N.8.], I, iti, pp. 297-8). 
In the following list Z refers to species inhabiting the Zostera 
beds, N to forms occurring in the rock-pools on the north side of 
the bay. 
Polycladida, Oligocladus sanguinolentus (Z). 
Rhabdoceelida. 
Acaia, Proporus venenosus (Z), Monoporus rubropunctatus (Z), 
Convoluta saliens (Z), C. paradoxa (N), C. flavibacillum 
(Picklecombe Fort). 
Ruaspocaia, Promesostoma solea (Z), P. agile (Z), Proxenetes 
flabellifer (N), Acrorhynchus caledonicus (N), Hyporhynchus 
