Plate IV. 



Fig. 1. Mclicerilites duiobrivciisis Greg Kivo zooccia with oijciiula aiui tliree lieU-iozooccia Iwo of 

 which are provided witli opeicula. Cliatham. X 34. 



— 2. The same species from Fecamp. Tliree hcterozooecia. X 34. 



— 3. The same species. Two large heterozooecia and three zooccia \\liich have heeii icgeiicralcd \>y 



means of heterozooecia. Luton. X 34. 



— 4. The same species. A regenerated zooecium with opercuUim. (Chatham. X 34. 



— 5. The same species. (Chatham. X 34. 



— (i. The same species. A zooecium the aperture of which is almost perfectly closed hy a concave 



lamina. There is only left a small opening in the distal half, ('.hatham. X 34. 



— 7. Mcliceritiles duiohrivensis, var. pannarmiita. 'Ihere is seen a number of small heteiozooecia 



two of which in old zooecia. one zooecium with opereuliini and another with a concave 

 closure-lamina. Gillingham. >: 34. 



— S. Mcliceritiles durobrivensi.i Greg. There are seen four regenerated zooecia, the distal of which 



has been regenerated twice while the two at the left side have been rcgcnciatcd several 



times. Chatham. >' 34. 

 !). Melireritiles iiiidala d'Orb. X 34. 

 10 The same species. Three zooecia have been regenerated by means of heterozooecia. X 34. 

 11. The same species. Two regenerated zooecia with opercula. 



— 12. The same species. Three heterozooecia one of which is intermediate between a lutcrozooccium 



and a zooecium. ',■ 34. 



— 13. The same species. Two heterozooecia. X 34. 



— 14. The same sjiecies. A zooecium regenerated by means of a hetcrozooeciuni. X 34. 



— 15. The same species. A zooecium v\ith a concave closure-lamina which l,s not yet clo.sid in the 



middle. X 34. 

 I(). The same species. A regenerated zooecium with operculum. > 34. 



— 17. 1 he same species. X 34. 



— IcS. Mcliceritiles Luticri d'Orb. Two zooecia with opercula. > 34. 



— lit. Mcliceritiles durohrii'cnsis, var. parviarmala. A [jortion of the inciusting base, consisting 



chiefly of heterozooecia. Chatham or Luton X 20. 



— 20. Two heterozooecia from the same colony. X liK. 



21. The same form. A portion of a two-layered colony with numerous heterozooecia. Basin de 

 Paris. X 34. 



— 22. Mcliceritiles peiilaijouitm n. sj). Three heterozooecia. Tullstorp. X 20. 



— 23. Mcliceritiles Dollfiisi I'crgcns. One of the two heterozooecia shows a calcareous maMclible. 



(jillingham. , 20. 



