396 



Plate XIII. 



Fig. 1 



— 3 a. 



— :tl). 



— ;i c. 



4 a. 



— ib. 



Oa. 



(ib. 



7 b. 



A goiiozon'ciuin of ('.dlpi-liuni poiulcrosiim 

 ((ioldsl!. X 2:t. 



Tlic same gonozoocciuni. IVoni the basal sur- 

 face. X 23. 



Tbe same (•onozoa'cium, lateral view. X 23. 

 A sagittal section thiougli a gonozodcium 

 of the same species. The covering kcnozod-- 

 ciiim and the distal wall transformed into 

 an oieciuni arc seen d. w.). X 23. 

 A gonozo(vcium and a corresponding covering 

 zocrcium of (Uilcnaria (on the i)late Viltali- 

 cclla) I'ormosd (Husk), The internal oceciuni 

 is seen, and in both the zocecia the small, 

 oval, infra-scapular chamber and the long, 

 narrow, pedal chamber are seen. X 55. 

 A gonozixccium and a corresi)onding cover- 

 ing ziKccium of Cdtcndria fVilliilicelld) clc- 

 Hiins liusU). X .').'■>. 



A gonozo<ecium and a covering zofccium of 

 the same species, lateral view. X 55. 

 Three old zotccia of the same si)ecies, the 

 aperture of which is on the point of closing. 

 X 40. 



A bi-zoiecial internode of Calcniirid i Villat.) 

 fusai (Mac (lilliv. '. The aperture is partly 

 closed. X 40. 



A gonozoicciuni with appertaining daughter- 

 zoncciuni of Ctilenaria fVittat.) cornttlit liuskX 

 X 55, 



A gonozooecium with appertaining daughter- 

 zo(ecium of Calciuiriu (Vitlal.) coniiiln (Busk , 

 from the basal surface. X 55. 

 A gonozoircium of the same species, lateral 

 view. The internal oiccium and the covering 

 kenozocecium are seen. X 55. 

 Onchopora on the plate CalweUki] ilcnkita 

 .Mac (iilliv.), from tiie basal surface. The 

 linger-shaped expansions of the distal wall 

 are .seen, X 40. 



T!\e pro.ximal end of a zo(ecium of the same 

 species. X 75. 



Oncbopora SincUiiri (Busk. In two of the 

 zocvcia the operculum is open and the in- 

 wardii^directed, angularly bent lateral parts 

 of the vcstibuhim are seen. X 40. 

 A zoa'cium with ooecium of the same spe- 

 cies. X 40. 



A sagittal section through an unlinished oa- 

 cium. The cryptoc\st, which rises from the 

 distal wall, is incorrectly drawn as connected 

 with the membranous endooiueium, (see pi 

 X.\IV, lig, IL'). X 40. 



I-ig. 7 d. 



— 7 e. 



— 7 f. 



— ■?«• 



— 7h. 



— 8 a. 



8 b. 



8 c. 



9 a. 

 9 b, 



9 c 



— 9d, 



— 9 c. 



— !) f. 



— 9H- 



— Oh, 



— 9 i, 



— 9j- 



.\ sagittal section liirongh an oieciiim of the 

 same species. Here also the cryptocyst is 

 drawn as connected with the cndooiecium, 

 ekto — the ectocxecinm; endo — cryplocysl 

 together with the cndooa-ciuni, X 40. 

 An o(i"ciuni of the same species, lateral \iew. 

 X 40, 



An undeveloped oceciuni of the same species, 

 from the frontal surface. X 40. 

 An ofcciuni of the same species, from the 

 basal surface. X 40. 



A transverse section ■ through a branch of 

 the same species. Two distal walls with ro- 

 sette-plates and two compensation-.sacs are 

 seen. X 40. 



Calwellia (on the plate OnchopnrclUi) hicor- 

 nisWyv. Th. The one half of the distal wall 

 of the lowermost pair of zocccia is seen and 

 also two of the internal o\al rosette-plates, 

 through which the stalk-like proximal end 

 of a pair of zoiecia is in coniinuuication 

 with the wider distal part of another pair. 

 X 40. 



A transverse section through a branch of 

 the same species, between the stalk-like 

 proximal part and the wider distal part. A 

 pair of zo(Pcia is seen from the distal end, 

 and also the forked distal walls and four 

 intersected stalk-like proximal ])arts. X 55. 

 A transverse section through a branch of 

 the same species, approximately tlirongh the 

 middle of the wider distal part of a pair 

 of zoiecia. X 55. 



Oncboporella bomhyciiui liusk). X 40. 

 A sagittal section throngii two zocecia of the 

 same species with oci'cia, ekto — the ecto- 

 0(ccium, The cryptocyst removed, X 40, 

 A sagittal section thrmigh two zoa'cia, fur- 

 nished with radical librcs. The one descend- 

 ing part of tlie distal wall is seen, X 40, 

 Two zofecia of the same species with radical 

 fibres, from the basal surface, X 40 

 A part of the margin of a colony, X 40, 

 Zofccia of the same .species with developing 

 occcia. X 40. 



Transverse sections of two zocecia and of a 

 kenozofecium. X 40. 



The first beginning of an ocecium. X 40. 

 Developing oiccium, a little older. 

 Developing oiecium, in which the basal sur- 

 face of the crvplocyst is almost formed. 

 X 00. 



