402 



Plate XVI. 



— 1 



— 2 



— 3 b. 



I"i(!. 1 :i A s:i);ittal section tbioiigh a colony of llas- 

 ii'vUiii coronala (lieussi. Three on?cia are 

 seen X 17. 



All operculum of the same species. X 140. 

 A sai^ittal section Ihroufjh Uasivellia aiis- 

 Iriiliensis (Busk. Tlie four lowermost zore- 

 eia with od'cia. X 17. 

 All opereuluni of the same .species. X 75. 

 Tiibuccllaria hirstiUi (l.amx.). The four 

 lateral zoiecia with |)eristoniial oiecia. X 17. 

 A saj^ittal section tlirough the same species. 

 The two lowermost zoa-eia with ooecia. X 23. 

 Oiiereulum of the .same species. X 75. 

 A separatin;; wall with rosette-plates, the 

 position of which is at the proximal end of 

 each of the thrcad-sliai)ed apjicndages. X 200. 

 A part of the surface of a zoiecium of the 

 same species. The ascojiore is .seen distallv. 

 X 75. 



Tubiicellaria opuntioiiles (I'all.). Five occeia 

 are seen. X 12. 



A sagittal section through the same species. 

 Two od'cia arc cut through. X 23. 

 An operculum of the same species. X 75. 

 The same species. A ))art of the surface of 

 a zooecium. The aseojiore is seen distally. 

 X 55. 



Tithiporclla imifinirostris (Mae Gilliv.). Two 

 peristomial ooecia arc seen. X 23. 



— 3 I 



4 a 

 — 4h 



— 4 c. 



— 4d 



I'ig .') 1). The same species from the basal aspect 

 after removal of the ha.sal surface. Two 

 oceeia (which are however not correctly 

 shaded) arc seen, and the three zotreia show 

 a distinct vestibular arch. X 23. 



— 5 e. The same species. A part of tlie surface of 



a zooecium. X 55. 



— 5d. A sagittal section through the same species. 



.\n occcium is seen pro.ximally, and the two 

 zoiecia show a vestibular arch at the be- 

 ginning of the peristomial tube. X 17. 

 LeUythopora hystri.r Mae (iilliv. Three ooe- 

 cia are seen. X ()5. 



A sagittal section through an otccium of 

 the same species. X 23. 

 An operculum of the same s|)ecies. X 55. 



— 7 a. A sagittal section Ihrougli LeUijtbopora stel- 



lata Pusk'. Two ooecia are seen. X 17. 



— iS a Eulhijroides Jellijac n. sp. X 40. 



— X 1). The distal end of a young zooecium of the 



same species. The frontal surface is caleilied 

 right up to the operculum. X 75 



— cS c. The distal end of an older zocccium in which 



a resorption of the chalk has taken iilaee 

 jM'o.ximally to the operculum. The two hol- 

 low s))ines are formed, which cover the 

 entrance to the comi)cnsation-sac. X 75. 



— 8d. An o])erculum of the same species. X 100. 



— 8 e. An avicularian mandible of the same spe- 



cies. X 40. 



