Yorkshire Naturalists at Robin Hood's Bay. 201- 
MarINE Motiusa.—The Rev. F. H. Woods, B.D., writes :— 
The Mollusc Fauna of Robin Hood’s Bay does not appear to be 
very extensive, but is not without interest, being determined by 
the rocky character of the coast. No examples were found of 
those genera which live in sand and mud, while those which feed 
on the alge and live in or upon the rocks were very fairly repre- 
sented. For this reason there was a large preponderance of 
univalves over bivalves. Of the two borers, Pho/as crispata is very 
characteristic of the Yorkshire Coast, being exceedingly abundant 
at Redcar and frequent at Bridlington. The louse-like mail shell, 
Chiton cinereus, was very abundant, and one was found very near 
high-water mark. One remarkably fine specimen, over an 
inch long, of the lesser hairy mussel, Modiola phaseolina, was 
found. The blue-striped limpet, He/czon pellucidus, was very 
abundant, and the beautiful little pink limpet, Zectura virginea, 
was fairly frequent. The most interesting were the smaller, 
and often minute shells. About two table-spoons of fine shingle, 
taken from the surface of the drift, were exhaustively examined 
under a lense. There were three distinct species of /zssoa. 
Curiously enough, while 2. s¢vzafa was very abundant, &. parva, 
which can be gathered by the thousand on a favourable day at 
Bridlington, was comparatively scarce. Of the third species, #. 
punctura, there were two specimens. This is found rather 
sparsely about the Yorkshire coast, and appears to be a northern 
species. All three are remarkably beautiful seen under a lense. 
Of the two Pleurotomas, P. turritella | found at Bridlington occas- 
ionally, the other I have not found nor seen before. Except for the 
channelled mouth it is remarkably like a Rzssou parva. It is pro- 
bably, however, an immature specimen. There was also a very 
good example of Zornatinus truncatulus. A single valve of a shell 
of the Venus type appears to be an immature C7zrce minima. It is 
certainly not Venus Gallina, which in its young state is easily 
recognisable. Among the drift were also many examples of 
several common shells in a very young state. Well worth 
mentioning is the Odostomia sptralis, a shell found fairly 
frequently along the Yorkshire coast, but I have not seen it 
elsewhere. The specimens here are always very small, about 
jis of an inch or less, but I have carefully compared them with 
the smallest in the Barlee type collection at Oxford, and have 
no doubt about their identity. The other Odostomza, is very 
common about the coast, but is evidently immature; it may be 
conoidea or possibly acuta, but it agrees with none in the Barlee 
collection. 
1907 June 1. 
