404 



Plate XVII. 



V'tfi. 1 :). Eschitrella <li(iphaiia (Mac Gilliv.). A young 

 colony with tlie primary zoa'ciuni. Pore- 

 ilianibcrs are seen on tlirec zotpcia. X 40. 



— 1 I) Two zod'cia of tlic same species. Pores are 



seen inside the marginal ridge. X 40. 



— 1 c. Tlie same species. Tlie distal liall' of a zoie- 



eiuin, the frontal wall of whieh has been 

 removed, so that the highly developed vesti- 

 bular arch may be seen and the rods by 

 which it is connected with the lateral walls. 

 X 55. 



— 1 d. The distal half of a zoiecluni of the same 



species, seen from the basal snrface after 

 removal of the basal wall. The basal wall 

 of the vestibnlar arch is seen. X 55. 



— 2 a. Escharclla iilnissicola (Norman). A sagittal 



section through a zocrcium with oa'cium. 

 The oopcium is surrounded by a kenozoce- 

 eium, the frontal wall of whieh seems to 

 be united with that of the ocL'cium. X 40. 



— '1 b. The .same species, from the basal surface. 



Three occeia are present, the surrounding 

 licDozoopcia of which are furnished — like 

 the zooccia — with pore-chambers. X 17. 



— .la. EschiircIId imniersu I'lem.i var. The basal 



portion of the endoo<ecium is surrounded 



by the crvptocvst of the distal zocccium. 



X 40. 



Escharoides ])rucslans (Hincks). X 40. 



The same species from the basal surface. 



I'ore-chambers. X 'i.'i. 



Escharoides saiiroiiloss<i n. sp. X 40. 



The same species, from the basal surface. 



The vestibular arch with its thickened 



margin is seen. X 40. 



— 5 c. The distal end of a zocccium of the .same 



species. Pro.ximally to the sjjines the vesti- 

 bular arch is seen. X 55. 



— 5d. An avicularian mandible of the same spe- 



cies. X 75. 



— 5 e. A distal wall of the same species, with pore- 



chambers. X 40. 



— 5 f. Three opercula of the same species. The 



smallest is not from the same colony as 

 the two large ones. X 75. 



Fig. 

 — 



7 b. 



— 8 



— 8 



8 c. 



— i)b 



— !) c. 



10 



1 1). 



10 I 



Exochella loncjiroslris .Jullien. X 55. 

 A zod'cium of the same species, from the 

 basal aspect, after removal of the basal 

 surface. The primary aperture is seen and 

 also the secondary and tertiary; further 

 the vestibular arch X 75. 

 Exochella lohata n. sp. X 75. 

 The distal end of a zixccium of the same 

 species, from the basal aspect, after removal 

 of the basal surface. The vestibular arch 

 is seen in addition to the primary and 

 secondary apertures. X 75. 

 An operculum of the same species. X 140. 

 Exochella zelanica n. sp. X 76. 

 A zocccium of the same species. Three 

 pore-chambers are seen. X 75. 

 .\ zooecium of the same species, lateral 

 view. The strong rostrum proxinially lo 

 the aperture is seen and also the maigiiuil 

 ridge which is very prominent, running 

 out into lobes. Inside the ridge porc-cauals 

 are seen. X 75. 



Exochella triciispis (llincksi. X 75. 

 The distal end of a young zocccium of the 

 same species, whieh shows the primary 

 aperture Three pore-chambers. X 75. 

 The distal end of a zonecium of the same 

 species, from the basal aspect, after re- 

 moval of the basal surface. The vestibular 

 arch, the primary aperture and the thiee 

 coalesced teeth of tlie secondary apeiture 

 are seen. X 75. 



An operculum of the same species. ,X 140. 

 .\ multiporous rosette-plate of Sniilliiui 

 I'allasiana (Moll.). X 350. 

 ■A schematic longitudinal secticm through 

 a multiporous rosette-plate. To the right 

 is seen the pore-ring. 



A schematic longitudinal section through 

 a |)orc-cluimber To the right the ol>lic|ue 

 wall on which the rosette-plates are situ- 

 ated 



