48 Transactions of the Society. 
him for the care which he has shown in the preparation of the litho- 
graphs. 
In addition to those friends to whom, at the commencement of this 
series of papers I have acknowledged my obligations, must be added 
the name of my friend Mr. Fortescue W. Millctt of Marazion, who has, 
by his intimate knowledge of the literature of this subject, greatly 
helped to render the foregoing descriptions and lists as free, perhaps, 
from errors of nomenclature as is possible in dealing with such a 
variable group of organisms ; also to my wife my thanks are due for 
much assistance in the selection of the fossils, and in other details in 
connection with this work. 
CORRIGENDA AND ADDENDA. 
Part 1. Journ. B. Micr. Soc., 1891. 
P. 567, line 13 from top, et seq., for “ Bolivina textularioide8 ,, read Boli- 
vina textilarioides. 
P. 568, line 21 from top, et seq., for “ Textularia pygmsea Reuss” read 
Textularia minuta Berthelin (see pt. 2, p. 327). 
P. 568, line 2 from foot, for “ Botalia spinulifera ” read Pulvinulina 
spinulifera. 
P. 569, line 14 from top, for “ Nudosaria simplex Silvestri ” read Nodo- 
saria oligostegia Reuss. 
P. 569, line 15 from foot, for “ Nodosaria Jonesi Rss.” read Nodosaria 
radicula (L.) var. Jonesi Rss. 
P. 570, line 10 from foot, for “ Spirillina vivipara Ehrenb.” read Spiril- 
lina tuberculata Brady. 
P. 572, line 9 from top, for u Pleurostomella eocsena Giimbel ” read 
Pleurostomella alternans Scliwager. 
Pp. 574 and 575. Ophthalmidium tumidulum Brady, Cornuspira cretacea 
Reuss, C. involvens Reuss, and C. foliacea Philippi sp. are trans- 
ferred to Ammodiscus incertus d’Orbigny sp. (see p. 21). 
Part 2. Journ. B. Micr. Soc., 1892. 
P. 324, line 2 from top, delete “and Wealden beds.” 
Part 3. Journ. B. Micr. Soc., 1892. 
P. 750, line 12 from foot, for “ Spiroplecta annectens ” read Spiroplecta 
complanata. 
P. 756, line 21 from top, for “ Upper Triassic ? ” read Lias. 
P. 756, Bulimina polystropha Reuss is now determined as Verneuilina 
pygmsea Egger sp. 
Part 4. Journ. B. Micr. Soc., 1893. 
On Plate IX. transpose the numbers 15 and 16. 
P. 580, in explanation to plate VIII. and p. 587, line 1, for “ Nodosaria 
farcimen Soldani sp.” read Nodosaria far cimen Reuss after Soldani. 
P. 583, line 5 from foot, for “ Pitspuhl ” read Pietzpuhl. 
