103 
previously recorded. The Idmonea serpens was a species 
which usually grew over stones and dead shells. One 
variety was found in marked abundance on some of our 
sandbanks, and its distinguishing features were, he believed, 
caused by local conditions. Not being able to find dead 
shells or stones, they had settled down upon zoophytes, and 
having to grow upon little filaments they had taken to a 
peculiar mode of growth, which had led to the formation of 
a marked variety. About fifty species of marine worms 
were found last summer — among them the rare Malmgrenia 
castanea and Hermadion assimile. The specimen of the 
latter which the Committee had obtained was, he believed, 
the first perfect one which had been seen. They also got 
an immense number of specimens of the copepoda, little 
crustaceans. Several of the species were new to Britain. 
Another of the rare things which the dredging expedition 
resulted in finding was a most beautiful specimen of the 
Goniodoris castanea, which had been discovered only three 
times in British seas. The collection of Nudibranchs also 
included many specimens of the large and beautiful Ben- 
dronotus arhorescens,Si species which is particularly abundant 
at Hilbre Island at certain times of the year, and almost 
absent at others. 
On the motion of Professor Williamson, seconded by 
Professor Marshall, a vote of thanks was given to Professor 
Herdman for his address. 
The following objects were exhibited in the Basement 
Boom, 
By Mr. E. D. Darbisliire. — 
A series of Fusus antiquus, forms reversed, (contrarius) and dextral, from 
the Coralline and Eed Crags of Suffolk, remarkable for size and variety 
of facies, v^ith recent ones of the now normal dextral form, and of what 
is now the reversed monstrosity, including a series from the egg- 
capsules and young, up to the large adults of the great white form of 
the Irish Sea. A series of form contrarius from the Drift at Worden by 
Leyland, was exhibited from Miss ffarrington’s cabinet. 
Also other British species of Fusus, young and mature. 
