DESMEPORA. 
115 
DrSTRIBETIOX. 
Upper Chalk — Zone of Actinocamax quadratus: East Harnham, near 
Salisbury. 
Figures. 
PI. III. Fig. 9. The type -specimen. Fig. 9a, part of the 
obverse surface ; X 6 dia. Fig. 9J, part of the side of a branch 
showing the ends of the pinnules and the groups of apertures ; 
X 6 dia. Upper Chalk — zone of Actinocamax quadratus : East 
Harnham, near Salisbury. D. 4328. 
Affinities. 
This species is founded on an excellent specimen originally 
collected by Dr. H. P. Blackmore, F.G.S. The species differs 
from B, semicylindrica, by having the apertures on the ends of 
the tufts in the same plane as the width of the stems. They 
resemble transverse rows rather than bundles. The apertures 
are placed on the pinnules in two rows resembling the arrange- 
ment of Idmonea. The stems are wider and flatter than in 
D. semicylindrica. 
D. 4328. The type-specimen. Upper Chalk — zone of Actinocamax quadratus : 
East Harnham, near Salisbury. Gamble Coll. Figd. PI. III. 
Fig. 9. 
3. Desmepora pinnigera,^ Gregory, 1909. 
Synonymy. 
Desmepora pinnigera, Gregory, 1909. New Cret. Bry. : Geol. Mag. dec. 5, 
vol. vi. p. 63. 
Diagnosis. 
Zoarium composed of short, thick, somewhat swollen branches, 
which rarely subdivide, and are frequently arranged in 
a cross. There may be five arms. 
The zoarium is attached by a short peduncle and base. The 
sides are marked by a series of ridges, which extend across 
the whole width of the side. 
Apertures arranged along the lateral ridges ; the apertures are 
biserial or rarely triserial, and there are usually from five 
to seven in each row. Obverse face of the zoarium concave. 
The spaces between the raised groups are marked by rows of 
small round pores (cancelli) between horizontal ribs. 
1 Pinniger, ‘finned,’ the lateral appendages occurring as fiat, broad plates 
and not as pinnules. 
