22 W. D. Lang—Evolution of Stomatopora. 
The following diagram shows these forms and three others which 
complete the series in the Bathonian; and from it can be seen 
the changes accompanying the shape and length of the zocecia 
in passing from the lower to the higher horizons :— 
6. Cellaria Smithi, Phillips: Cornbrash, Scar- 
borough, Yorkshire. 
5. Stomatopora Phillipsi, Vine: Cornbrash, 
Thrapston, Northamptonshire. 
4. Stomatopora intermiata, Vine: Cornbrash, 
Thrapston, Northamptonshire. 
Oo 
2 fe) 
3. Aleeto diehotoma, Michelin:  Bajocian, 
Calvados, Normandy. = <dlecto dichoto- 
moides, d’ Orbigny. 
fe) 
2. Stomatopora dichotomoides, Haime: Aalenian, 
Pea Grit, Postlip. = Stomutopora dichoto- 
moides (WV Orbigny), mutation AMwchison- 
ensis. 5 
° 
fa) 
1. Stomatopora Gregoryi, mutation capricorn- 
ensis, Lang: lias, eapricornws zone, 
Cherrington, Warwickshire. 
(2) 
Evo.ution or SzomaTopora DicHoTomorpeS (d’Orbigny). 
