ON THE BRITISH FOSSIL CORALS. 75 
the hard and shelly epimeral pieces of the body-segments are not properly 
developed (as they are in the common lobster and other active swimming 
long-tailed forms), and the lobes of the tail are in like manner rudimentary. 
Such changes I cannot but conceive to have been the result of long habit, 
arising from the disuse of the organs of a part of the body, causing first their 
gradual reduction in size, and finally resulting in their abortion. The 
two new species of T'halassinide I have to notice belong to the genus 
Callianassa, hitherto characteristic of the Maestricht Chalk, and found also 
living in our own seas. We are now able to take it back to the Lower 
Greensand on the one hand, and link together the Cretaceous and Recent 
periods by a species in the Eocene beds of Hempstead, Isle of Wight. I have 
named the first Callianassa Neocomiensis, from the Greensand, Colin Glen, 
Belfast (Pl. Il. fig. 5), and the second Callianassa Batei (after Mr. C. Spence 
Bate), from Hempstead Upper Marine series, Isle of Wight. (Plate IT. fig. 4.) 
This is a genus which should be looked out for by collectors of Upper- 
Chalk fossils in Norwich. 
The Plates exhibited are intended for the second part of my Monograph on 
. the fossil Merostomata, which now awaits its turn of publication. I wish to 
add a word here in favour of the Palzontographical Society, as deserving of 
support, as a means of enabling authors writing upon special branches of 
Palzontology to secure the publication of their researches. If more sub- 
scribers would only come forward in its aid, more authors would be enabled 
to make their work known, and much time would be saved. The last volume 
issued is an illustration of what they give for their annual guinea subscrip- 
tion*. 
Casts of the largest of the Paleozoic Crustacea have already been prepared 
and coloured, and copies sent to Liverpool, Dublin, Oxford, Cambridge, 
Edinburgh, Glasgow, Norwich, and elsewhere, for the Museums of those 
cities. 
EXPLANATION OF PLATE II. 
Fig. 1. Cyclus radialis, Phillips, sp. From the Carboniferous Limestone of Bolland, 
Lancashire, and Visé, Belgium. Enlarged five times the natural size. 
Fig. a ae Rankini, sp. nov. From the Coal-shales, Carluke, Scotland. Magnified 
ve times. 
Fig. 3. Peneus Sharpii, sp. noy. Lower Lias, Northampton. A fourth less than the 
natural size (the outlined parts are restorations). 
Fig. 4. Callianassa Batei, sp. nov. Upper Marine series, Hempstead, Isle of Wight. 
Natural size. 
Fig. 5. Cailianassa Neocomiensis, sp.nov. Greensand, Colin Glen, Belfast. Natural size, 
First Report on the British Fossil Corals. 
By P. Martin Duncan, M.B. Lond., F.R.S., F.G.S., Sec. Geol. Soc. 
Tuts Report consists of notes of observations made upon the Coral-faune 
described by MM. Milne-Edwards and Jules Haime in the monograph of the 
‘ British Fossil Corals’ (Paleontographical Society, 1850), of deseriptions of 
new and unpublished species, of notices of species published by me in 1867 
‘and 1868, and of examinations into the affinities of the forms and their 
geological positions. 
_ * The last volume issued contained 45 Plates (9 of which were double quarto) and 238 
4to pages of text. 9 
G 
