SUPPLEMENTAL NOTES. 
93 
second with the central chamber. That is the common rule. Except in the 
second pair, the larger species without central chamber is always much less 
numerous. 
“ As far as I know, N. Heberti and Orbignyi have not yet been observed in 
England. I should be very much surprised if they do not exist in the same beds 
with N. variolaria and Wemmellensis (Preshvichii). Their absence would be a 
remarkable exception to the general law of the distribution of the Nummulites, 
according to which, the characteristic species of a bed are always tico, of the same 
zoologic group, of which the larger Jias no central chamber and the smaller always has 
one : examples : — N. perforata and Lucasana, Brongniarti and Molli , complanata 
and Tchihatcheff , Assilina exponens and mamillata , spira and subspira, granulosa 
and Leymeriei, N. contorta and striata , Biaritzensis and Guettardi , &c.” 
[Here follows an offer to examine all the English species of Nummulites at 
some early opportunity, if hand-specimens of the containing beds be carefully- 
collected and forwarded.] 
“ I send you together with this letter two papers : — one on the Nummulites 
of Nice and the neighbourhood, followed by an * Echelle des Nummulites/ or 
Table for the Stratigraphical Distribution of the Species. 
“ The second is a description of the species from the upper beds of Biaritz. 
u Believe me, Sir, 
“ La Provence, Lausanne, Switzerland, u Yours most obediently, 
“ 1st October, 1879.” (Signed) “ Phil, de la Harpe, M.D.” 
The results of our deceased friend’s examination of the English and Belgian 
Nummulites, as above given, are of great interest ; and the enumeration of the 
specimens at pages 22-25 and 35 of the Catalogue has to be studied with the light 
thus thrown on them. 
The proposed specific name il N. Wemmellensis ” for the type to which my 
“ N.planulata , var. Prestwichiana ” evidently belongs, has such strong justifica- 
tion that I acceded to the acceptation of my friend Yanden Broeck’s sugges- 
tion. Still, for convenience, the term u Prestwichiana ” has been frequently 
entered in the Catalogue, as a synonym. 
The clear-sighted differentiation and grouping of the pairs of Nummulites, 
having large and small primordial chambers, respectively, carries out to a prac- 
tical result the observations made in the ‘ Annals and Mag. Nat. Hist.’ September 
1861, p. 233. Many notes on the condition of the first or central chamber will 
be found in the list of the Egyptian, Crimean, and other Nummulites, in the 
Catalogue. 
The sorrowful loss that relatives and colleagues have suffered by the death of 
Philippe de la Harpe is deeply felt also by palaeontologists, who had full hope 
of reaping great benefits from his scientific industry and experience. 
