STOilATOPOEA. 
19 
S. divaricata is really a Foraminifera, probably a species of 
Wellina. The specimen is very much worn, but the oval 
chambers look something like the zooecia of a pyriform Stomato- 
pora. The figures in the Proc. Yorks. Geol. Soc. (vol. xi. pi. xvii. 
fig. 6) is purely diagrammatic. 
LIST OF SPECIMENS. 
60,252. "With Froboscina crassa (Rom.), var. francorum (Perg.), on Micraster 
cortestudinarium (Goldf.). Upper Chalk. Dixon Coll. Figd. 
Dixon, Geol. Suss. pi. xviii. a, figs. 1, la, \b {non Ic), as Alecto 
gracilis. The specimen is also the type of S. dixoni, Yine. Figd. 
PL I. Fig. 5. 
L. 490. Another specimen of the Upper Cretaceous variety. Middle Chalk. 
Chatham. Gamble Coll. 
D. 2011. The specimen described and figured by Yine as representing this 
species in the Red Chalk is a Foraminifera, which Prof. T. Rupert 
Jones, F.R.S., has kindly identified as a Webbina. Specimen 
No. 2 : Quart. Joum. Geol. Soc. vol. xlvi. p. 464. 
4. Stomatopora calypso (d’Orbigny), 1850. 
Synonymy. 
Alecto calypso, d’Orhigny, 1850. Prod. Pal. vol. ii. p. 265. 
,, ,, d’Orbigny, 1851. Bry. Cret. pi. 630, figs. 5-8. 
Stomatopora calypso, d’Orbigny, 1854. Ibid. p. 841. 
,, ,, Marsson, 1887. Bry. Riig. : Pal. Abb. vol. iv. pt. l,p. 14. 
,, ,, Pergens, 1890. Revision, p. 330. 
,, linearis, Yine, 1890. Bry. Red Chalk: Quart. Journ. Geol. Soc. 
vol. xlvi. p. 466. 
,, ,, Yine, 1891. Pol. Red Chalk: Proc. Yorks. Geol. Soc. 
vol. xi. p. 373, pi. xvii. fig. 5. 
Diagnosis. 
Zoarium usually crowded and reticular, formed of short, wide 
branches, which subdivide repeatedly ; but sometimes the 
series are long and unbranched. 
Zooecia very short ; oval in shape. 
Peristomes well raised. The walls are marked by a series of 
from two to twelve regular, parallel, transverse folds. 
Dimensions. 
Length of zooecia 
Diameter of zooecia 
Diameter of apertuie 
B.M., D. 953. B.M., D. 2015. 
•9 mm. ... 1 mm. 
,. -5 „ ... -5 „ 
. *2 „ ... -15 „ 
