ANNIVERSARY ADDRESS OF THE PRESIDENT. 43 
species, brought up to 155 the number of Chilostomata discussed 
by him. 
In a paper entitled ‘“‘ Notes on Brocchi’s Collection of Shells,” 
Dr. Gwyn Jeffreys placed before us a revision of the collection 
described by Brocchi in the ‘ Conchologia fossile Subapennina,’ now 
preserved in the Museo Civico at Milan, 
Dr. Jeffreys’s extensive and exact knowledge of living and fossil 
forms gave, as one of the speakers in the debate remarked, this 
paper a peculiar value. 
Mr. J. 8. Gardner, in a paper ‘‘ On the British Cretaceous Nucu- 
lide,” embodying the results of a close study of his very extensive 
collection of these shells, discussed the distinctness of the Nuculide 
from the Arcide, and the descent of the Cretaceous from the earlier 
forms, and suggested the adoption of a trinomial nomenclature 
expressive of the relationship of species. 
If I may be permitted for a few moments to digress from the 
Society's work, I would invite attention to Dr. G. J. Hinde’s 
valuable ‘Catalogue of Fossil Sponges’ just issued by the Trustees 
of the British Museum. ‘Treating principally of the sponges of 
the Chalk, Greensand, and Oolitic beds, it will long be the standard 
work of reference on the subject. 
Taking the papers on Vertebrata, in the zoological order of their 
subjects, the first to be noticed is that communicated by Mr. J. W. 
Davis on 19th December, ‘“‘ On some Remains of Fossil Fishes from 
the Yoredale Series at Leybourne, in Wensleydale.” A considerable 
series of careful descriptions of these remains, mostly teeth and 
spines, and diagnoses of species, several of which the author con- 
sidered new, formed the chief part of this communication. The 
author’s great experience in fossil Ichthyology is a guarantee for the 
skilful treatment of these difficult fossils; yet after an attentive 
consideration of the paper, I could not dispel the conviction that, 
having regard to the formal variation of the teeth in different parts 
of the mouth, it is evident that species founded on detached and 
isolated teeth should be regarded as provisional only until their 
validity has been established by fossils demonstrating the complete 
dentition—a caution which I feel confident the author himself 
recognizes. 
I may be permitted here to congratulate Mr. Davis on the com- 
pletion of his monograph on “The Fishes of the Carboniferous 
Limestone,” recently published in the ‘Transactions of the Royal 
Dublin Society,’ chiefly based on the Florence-Court Collection, 
formed by the Earl of Enniskillen, and lately added to the National 
Collection in the Cromwell-road, which contained a large number of 
Agassiz’s type specimens. It is certain for a long time to be the 
standard work of reference on this Ichthyic fauna. 
Reptilia, using this designation in its widest sense, have again, as 
in former years, furnished the subjects of several communications. 
One of the first of these was that by Prof. H. G. Seeley “ On the 
Dinosaurs from the Maastricht Beds.” The remains, treated in this 
papers with the author’s customary eare and precision, are referred 
