406 



Plate XVIII. 



Kin 



1 a. ICscharinii pes an.tcris (Siiiitt\ The distal 

 end i)f a zdcvcium with (icpcium. X 75. 

 The distal iiid of an ordinary zoceciiim 

 X 75. 



An opcrenUnn of llic same speeies. X 75. 

 KsclKiriiKi Diitcrtrfi (And.). The vestibular 

 areli is seen and also tiic distal inarj^in of 

 the hinge teeth, wliieli for the most part 

 part are internal. X 75. 



The same speeies. The distal end of a zoo.-- 

 einm. from the basal aspcet, after the basal 

 surfaee has been partly removed. The liif^h 

 hinge teeth are seen and also the vestibular 

 areh and the proeesses springing from the 

 latter. X 55. 

 An opereulum of the same species. X 100. 



3 a. Schizoimrella {Sti/lopomoj longirostris Hi neks. 

 X 23. 



The same speeies. A portion of a colony 

 with superficial budding. X 23. 

 A zod'cial aperture of the same species 

 X 75. 



A zooeciuni of the same species from the 

 basal surface. X 40. 



.\n operculum of the same species. X 100. 

 An aviculai'ium of the same species. X 75? 

 An avieularian uKuulible of the same spe- 

 cies. X 75. 



Schizoporclla (St.) sjionyiles IPallas'. An oce- 

 eium is seen, the frontal half of which is 

 cut away. X 40. 



The same species. .\n od'ciuni from the 

 pro.\imal enci and distal walls with rosette- 

 plates. X 40. 



Operculum of the same species. X UK). 

 The same species. ()i)ereulum of a colonv 

 from Java. X 100. 



5 a. I'clniliii jiipoitiai \ Husk). The lowermost 

 zoreeium to the left shows a hollow, from 

 which the whole (Kcciuni has been removed; 

 the uppermost to the right shows on the 

 other hand an od'cium with the frontal wall 

 removed. X 40. 



5b. An operculum of the same species. X 75. 



1 b. 



2 b. 



2 c. 



— 3 b. 



— 3 c. 



— 3d. 



— 3 c. 



— 3 f. 



— H'- 



— 4a. 



— 4 b. 



4 c. 

 4d. 



I'ig (i a. I'orclla (?) corniita n sp. The ocecia are 

 furnished with acro])etal hollow spine-like 

 proeesses, X 40. 



— Ob. An o|)erculuni of llie same species. X 75. 



A more correct figure is seen on Plate 

 XXII, fig. 11 a). 



— 7 a. Arthropomti Cecili And.) A developing 



ooccium. X 40. 



— 8 a. I'orclla margnritiferii Ouoy & (iaim.'. In 



the bottom of the avieularia the primai-y 

 ribs of the frontal wall are seen, lioth the 

 0(ccia and the avieularian chambers show 

 concentric deposits of chalk. X 55, 

 !) a. A sagittal section through a gonozoieeium 

 of llippolhoa liijalina L. The oa'cium is 

 surrounded by a kenozoircium. 



— 10 a. A sagittal section through a gonozoiecium 



of Chorhoponi Uronf/niarti Aud. The ote- 

 cium is surrounded bv an avieularium. 

 X 55. 



— 1 1 a. Haploponid imprcssiuii And.) from the 



basal surface. The zo(Ccia and the keiui- 

 ziMccia surrounding the ocrcia arc furnished 

 with pore-chambers. X 40. 



— 12 a Smiltina akaroensis n. sp. The margin of 



the ooeeia is furnished with an oiecial 

 cover. X 55. 



An operculum of the same species. X 100. 

 FntI'dllolhecd tivailnitu (Mac (iiUiv.. .Si.\ 

 dilTerent zoiecia take part in the formation 

 of the o(vcium figured. X 23. 

 The aperture of a zoa-cium of the same 

 species. X 75. 



An operculum of a gonozo(ecium of the 

 same species. X 55. 



An operculum of an ordinary zoircium of 

 the .same species. X 55. 

 .\n avieularian mandible of the same spe- 

 cies. X 75. 



EurijslomelUi foniminiiient IliucUs Two 

 gonozo(ecia and an or<linary zo(ecium. X 40. 

 The same three zoiecia, from the basal 

 surface, which has a large uncalcilied cen- 

 tral part. X 40. 

 14 c. A sagittal section through a zocecium with 

 (MEcium. The ocrcinm and the covering 

 kenozoa;cium are seen. X 40. 



