251 
NOTE ON CLISIOPHYLLUM INGLETONENSE, SP. NOV. 
BY ARTHUR VAUGHAN, M.A., D.SC, F.G.S. 
B}' the kindness of Mr. Cosmo Johns, I Mas privileged to 
study the fossils he had obtained from the Carboniferous Base- 
ment Beds at Ingleton," and to add a note to his account of these 
interesting rocks (Geol. Mag., n.s., Dec. V., Vol. III. (1906), 
pp. 320-323). In it I suggested that these beds were deposited in 
Mid-Avonian (C-S) time, a suggestion that has been fully con- 
firmed by Mr. Johns in his subsequent work. 
The object of this note is to describe the new species of 
Clisiophyllum, which is recorded in the list of fossils from the 
Basement Beds as " Clisiophvllid (cf. Carcino-phyllum mendipenseY' 
(loc. cit. p. 322). 
CUSIOPHYLLUM INGLETONENSE, sp. nov. PI. XXXVIII., figS. 
\a-e. 
DESCBIPTION. 
External form : — 
Cylindrical in adult, cornute only in young. 
Epitheca smooth with annular thickenings and frequent con- 
strictions. 
Calyx deep, with sharp rim. 
Columella projecting from the floor of the calyx as a tall crested 
spike (quite as in Carcinophyllum). 
Horizontal section at adult stage (Figs, la, Id) : — 
Septa. 
Major and minor septa project forward into the medial area and 
are prolonged backward to the theca ; the majors extend across the 
medial area, the minors merely project into that area as short spikes. 
All the septa are strongly thickened at the inner wall. 
A fossula is onlv indicated, on the concave side, bv a shorter 
major septum. 
Inner Wall. 
Strongly marked out by stereoplasmic thickening. 
External Area. 
Completely septate, moderately broad, with 5 or 6 rows of inter- 
septal vesicles. 
Medial Area. 
Broad with few vesicles. 
Central Area, composed of three distinct elements :■ — 
(1) a strongty thickened mesial plate. 
(2) an inner " nucleus " of closely reticulate mesh. 
(3) an outer " aureole " of broad loose mesh. 
The boundary of the aureole is thickened, with the result that the 
central area is strongly marked ofi from the medial. 
The lamellae are numerous; thin within the aureole, thickened 
