EXPLANATION OF PLATES. 



PLATE I. 



FIG. 1. Stomatopora dichotomy, Lamx. Encrusting Apiocrinus elegans 

 (Defr.). Bradford Clay : Bradford. Zoarium nat. size, and 

 part, x 25 dia. [B. 4833.] 



FIG. 2. Stomatopora dichotoma, Lamx. Bradford Clay : Box, Wilt- 

 shire. Part of zoarium, x 25 dia. Holl Coll. [B. 4860.] 



FIG. 3. Stomatopora dichotomoides (D'Orb.). Great Oolite : Ham- 

 castle, near Bath. Part of zoarium encrusting Multiclausa, 

 sp., x 20 dia. [B. 4249.] 



FIG. 4. Stomatopora dichotomoides (D'Orb.), var. attenuata (Waif.). 

 Cornbrash : Thrapston, Northamptonshire, x 20 dia. 

 Vine CoU. [D. 927.] 



FIG. 5. Stomatopora waltoni, Haime. Fuller's Earth : Gloucestershire. 

 Zoarium encrusting Terebratula aff. plicata, Buckm., 

 nat. size, and some zooecia, X 22 dia. Presented by 

 G. K. Waterhouse, Esq. [97083.] 



FIG. 6. Proboscina jacquoti, Haime, var. expansa. Cornbrash : 

 Thrapston. Part of zoarium encrusting Nucleolites orbicu- 

 laris (Phil.), showing gonocysts, X 25 dia. Type of 

 P. ornata, Vine. Figd. Proc. Yorks. Geol. Soc. vol. xii. 

 (1893) pi. xiii. fig. 10. Vine Coll. [D. 2063.] 



