DT. H. Withers—New Chalk Cirripedes. 151 
United States Nat. Mus., 1906, vol. xxix, pp. 661-820), who received 
the entire collection of Scudder’s types in 1902, has since produced 
a monograph materially altering the relationships of many of the 
forms previously described, established a number of new genera, and 
revised previously existing ones. In the light of Handlirsch’s con- 
clusions, our specimen falls into the genus Archimylacris of Scudder, 
the type of which is Archimylacris acadica, Scd., with Archimylacris 
(Htoblattina) venusta as a nearly related species. I have much pleasure 
in naming the species A. Woodwardi, after Dr. Henry Woodward, 
to whom more than any other in this country paleontologists are 
indebted for their present knowledge of Paleozoic insects. 
EXPLANATION OF PLATE XY. 
Fie. la. Wing or tegmina of <Archimylacris (Etoblattina) Woodwardi, Bolton. 
Nat. size; length 18mm., width 10mm. Photographed from the 
original specimen by Mr. J. W. Tutcher. 
», 16. The same wing enlarged rather more than twice natural size. 
The specimen was obtained by Mr. David Davies from a dark-blue shale (about 
10 feet in thickness) overlying the No. 2 Rhondda Coal-seam in Clydach Vale. 
T1I].—Some New Specirs oF THE CIRRIPEDE GENUS SCALPELLUM 
FROM British Cretaceous Rocks. 
By Tuomas H. WrrHers. 
INCE the publication of Charles Darwin’s memorable monograph 
on the Fossil Lepadide (Paleontographical Society, 1851) little 
has been written on the British Cretaceous Cirripedes. Among the 
thirteen species of Scalpellum which Darwin figured and described, 
ten are British, and, so far as I am aware, only one, Scalpellum 
attenuatum,’ has since been added to their number. Several species 
have, however, subsequently been described from Foreign Cretaceous 
Rocks. 
During an examination of the collection of English Cretaceous 
Cirripedes in the British Museum (Natural History), I noticed several 
specimens which cannot be referred to any described species. They 
all belong to the genus Scalpellum, and by permission of the Keeper of 
the Geological Department, descriptions and figures are now given 
of them. 
The work of comparison has been rendered easier by the identification, 
in the course of it, of several of the type-specimens figured and 
described by Darwin (1851). Some of these are referred to in the 
following pages. 
Although I have followed Darwin and later authors in regarding 
certain characters as of specific value, I do not ignore the possibility that 
the forms here described as distinct species may eventually prove 
to be only stages or mutations in their development, and may perhaps 
connect forms already known. But not until all the existing material 
shall have been discriminated and recorded, and additional specimens 
are available from several horizons, will it be possible to apply 
1H. Woodward, ‘‘ Cirripedes from the Trimmingham Chalk and other localities 
in Norfolk’’: Gzor. Mac., 1906, Dec. V, Vol. III, p. 352, Text-fig. 37. 
