RETTTSH PAL;EOaENE BRTOZOA. 279 



Fig. 3. Idmonea gieleli, Stol., p. 256. London Clay, Haverstock Hill. Brit. Mus. 



No. 49656. X 55 diam. Fig. 3 «. Part of zoarium including an ooecium. 



Fig. 3 b. Transverse section. 

 Fig. 4. Idmonea afF. seriatojwra, Reuss, p. 258. London Clay, Haverstock Hill. 



Brit. Mus. No. B 4510. Fig. 4 a. Part of zoarium, X 18 diam. Fig, 4^. 



Mouth, X 32 diam. Fig. 4 c. Transverse section, X 18 diam. 

 Fig. 5. Idmonea aff. seriatopora. Back view of a zoarium, X 55 diam. 

 Fig. 6. Idmonea coronopus, Defr., p. 259. Calcaire grossier, Parnes. Brit. Mus, 



Fig. 6 a. Nat. size. Fig. 6 b. An entire colony, x 18 diam. 

 Figs. 7-9. Hornera farehamensis, n. sp., p. 260. London Clay, Fareham. Brit. Mus. 



No. B 3831. Fig. 7 a. A zoarium, nat. size. Fig. 7 b. View of back, X 18 



diam. Fig. 8. Part of another zoarium, X 18 diam. Fig. 9. Basal zocecia 



of another specimen, X LS diam. 

 Fig. 10. Entalopliora tergemina, n. sp., p. 260. London Clay, Sheppey Brit. Mus. 



No. B 4509. Figs. 10 a & 10 b. Two views of the same specimen, X 55 diam. 

 Figs. 11 & 12. Heteropora glandiformis, n. sp., p. 261. Barton Beds, Barton. Brit. 



Mus. No. B 4511. Fig. 11. An entire zoarium, X 18 diam. Figs. 12 a & 



12 b. Broken transverse sections showing internal structure. No. B 4512. 



X 18 diam. 

 Fig. 13. Liclienopora, sp. Barton Beds, Barton. Brit. Mus. No. B 4583. X 10 diam. 



The numerator of the magnifying-power ' fractions ' represents the original magni- 

 fication, and the denominator the reduction from the size of the field of the 

 microscope. 



VOL, XIII. — PART VI. No. 9. — June, 1893. 2 s 



