134 
Yorkshire Naturalists at Robin Hood's Bay. 
Arianta arbustorum (L.). 
Helix nemoralis (L.). 
H . hortensis (Mull.). 
Jaminea cylindracea (da C.). 
Vitrea puta (Alder.). 
V. alliaria (Miller). 
Ancylus fluviatilis (Mull. ) . 
Pisidium cinereum (Alder.) ? malformed. 
Freshwater Biology (J. M. Brown) : — Several becks were examined 
more or less casually in passing, and these were found to vary very 
considerably in the richness of their animal inhabitants. Howdale Beck 
was noticeably the poorest, and its paucity was probably to be associated 
with the scarcity of mosses and other larger forms of vegetation on the 
submerged stones, but curiously this beck yielded the most interesting of 
the stone-flies obtained, viz. Capnia vidua Kip., a curious species with 
remarkably short -winged males. Both sexes were later taken by Little 
Beck. No Ancylus, Gammarus or Planarians were noticed in Howdale 
Beck. 
Row Pasture Beck (Maw Wyke), Ramsdale Beck, and Stoupe Beck 
(Fylingdales) appeared to be similar to each other in their animal life, 
and showed the types usually associated with streams of this nature. 
On the more stable stones a considerable growth of Cladophora was noted, 
while aquatic mosses were more plentiful. The insect larvae included 
species of the Caddisflies Agapetus, Rhyacophila (with pupae), Plec- 
trocnemia, Hydroptila (in Row Pasture Beck), and various Limnophilids . 
In Ramsdale Beck the larva of Diplectrona felix occurred. Stone-fly 
larvae, Chloroperla grammatica , Nemoura sp. and Leuctra sp. were present 
in all these becks, while by Little Beck cast cuticles of Perlodes mortoni 
were plentiful, by Ramsdale Beck those of Tceniopteryx risi occurred on 
the bordering stones, while the fly of this last species was emerging in 
numbers along with those of Protonemura meyeri and of P. precox from 
Stoupe Beck. 
Larvae of the Mayfly Heptagenia lateralis were common in Row Pasture 
Beck, while those of Bcetis sp. and Ecdyonurus sp. abounded. Planarians 
were represented by Polycelis cornu t a in Row Pasture Beck, and by 
Planaria alpina in Ramsdale Beck. Gammarus, Ancylus, the beetle 
Elmis, with Velia currens on the surface in backwaters, were plentiful. 
Dipterous larvae were represented by Simulium (with pupae), Dixa, and 
tube-forming Orthocladids . Larvae of Pedicia rivosa occurred in Ramsdale 
Beck, and that of Tipula gigantea in Little Beck. 
In Row Pasture Beck the Water-shrew ( Neomys fodiens) was observed 
for some time, making short excursions from under the banks, and 
‘ nosing ’ about in the sediment, probably for larvae. 
A quantity of Sphagnum was collected from Brow Moor, at the head 
of Howdale, and examined for Rhizopoda, and the following (typically 
sphagnum species) were identified : — 
Arcella vulgaris Ehr. Neb el a flabellulum Leidy. 
Centropyxis aculeata (Ehr.). Heleopera petricola Leidy. 
Cryptodifflugia oviformis Pen. Euglypha strigosa (Ehr.). 
together with the Tardigrade, Macrobiotus hufelandpSch., and numerous 
Bdelloid Rotifers. 
Botany : Flowering Plants (Chris. A. Cheetham) : — The flowers 
were well ahead of those in the Settle area ; this was noticeable in 
Goldilocks ( R . auricomus) and Milkmaids (C. pratensis) . The 
Difflugia oblong a Ehr. 
Hyalosphenia papilio Leidy. 
Nebela collaris (Ehr.). 
N. tincta (Leidy.). 
N. militaris Pen. 
Assulina seminulum (Ehr.). 
Trinema enchelys (Ehr.). 
T. linearis Pen. 
Corythion dubium Taranek. 
A mphi trema flavum (Archer ) . 
The Naturalist 
