252 VINE : NOTES ON POLYZOA FROM THE CORNBRASH OF THRAPSTON. 
1850, is the only other Jurassic form placed in the Family Escharidae 
by Haime. 
2. Stomatopora intermixta, sp. n., pi. (XII. ), figs. 4 to 4b. 
Zoarium adnate, creeping, forming a series of reticulations by 
the anastomosis of the short branches, which are characteristic of 
this species. The Zooecia are unlike ordinary Stomatoporae. To the 
naked eye the cells seem to be much inflated, basally, but under the 
microscope this deceptive feature is soon resolved ; the short tubular 
Zooecia are then found to be of the ordinary uniserial Stomatopora 
type, beneath which there is a basal lamina similar in substance to 
the cell itself, and upon "which the cell rests ; peristomes raised, 
aperture orbicular. Occasionally two or three cells run in parallel 
lines, giving to the Zoarium a most peculiar Proboscinse feature. 
Horizon and Locality : Cornbrash, Thrapston. 
Habitat: On Ostreae. 
In general habit S. intermixta resembles Aulopora intermedia 
Goldfuss (Petrifac, p. 218, t 65, f. i.), but it differs from that 
species by the possession of the basal lamina already referred to. 
3. Stomatopora dichotoma, Lamx. 
1821. Alecto dichotoma, Lamx. Exp. meth. des generes des Pol. 
p. 84, pi. lxxxi., figs. 12, 13. 14. 
1822. „ „ W. D. Conybeare and Wm. Phillips. 
Outlines of the Geology of Eng- 
land and Wales, p. 214. 
1854. Stomatopora dichotoma, Haime. Descr. des Bryozoaries 
Foss. de la Form. Juras. p. 160 ; 
pi. vi., f. 1. 
1889. „ „ E. A. Walford. Quart. Jour. GeoL 
Soc, vol. xlv., p. 563. Under the 
last two references the whole bi- 
bliography of the species is given 
up to date. 
The true S. dichotoma as given, and so ably described by Haime, 
is not abundant on the fossils of the Thrapston horizon. I have, how- 
ever, good typical examples encrusting Terebratula maxillata, from the 
Great Oolite, Kidlington, Oxon, which conforms, in every particular, 
