396 



Fig. 1 a. A gonozocEcium of Calpidium ponderosum 

 (Goldst). X 23. 



— lb. The same gonozooecium, from the basal sur- 



face. X 23. 



— 1 c. The same gonozooecium, lateral view. X 23. 



— 1 d. A sagittal section through a gonozooecium 



of the same species. The covering kenozooe- 

 cium and the distal wall transformed into 

 an ooecium are seen (d. w.). X 23. 



— 2 a. A gonozooecium and a corresponding covering 



zooecium of Catenaria (on the plate Vittati- 

 cella) formosa (Busk), The internal ooecium 

 is seen, and in botli the zooecia the small, 

 oval, infra-scapular chamber and tlie long, 

 narrow, pedal chamber are seen. X 55. 



— 3 a. A gonozooecium and a corresponding covei'- 



ing zooecium of Catenaria (Yittaticella) ele- 

 gans (Busk). X 55. 



— 3 b. A gonozooecium and a covering zooecium of 



tlie same species, lateral view. X 55. 



— 3 c. Three old zooecia of tlie same sjiecies, the 



aperture of whicli is on the point of closing. 

 X 40. 



— 4 a. A bi-zooecial internode of Catenaria (Yittat.) 



fusca (Mac Gilliv.). The aperture is partly 

 closed. X 40. 



— 5 a. A gonozooecium witli appertaining daughter- 



zooEcium of Catenaria (Yittat.) cornuta (Busk). 

 X 55. 



— 5 b. A gonozooecium with appertaining daughter- 



zocEcium of Catenaria (Yittat.) cornuta (Busk), 

 from the basal surface. X 55. 



— 5 c. A gonozooecium of the same species, lateral 



view. The internal ooecium and the covering 

 kenozooecium are seen. X 55. 



— 6 a. Onchopora (on the plate Calwellia) dentata 



(Mac Gilliv.), from the basal surface. The 

 finger-shaped expansions of the distal wall 

 are seen. X 40. 



— 6 b. The proximal end of a zooecium of the same 



sijecies. X 75. 



— 7 a. Onchopora Sinclairi (Busk). In two of the 



zooecia the operculum is open and tlie in- 

 wards directed, angularly bent lateral parts 

 of the vestibulum are seen. X 40. 



— 7 b. A zooecium with ooecium of the same spe- 



cies. X 40. 



— 7 c. A sagittal section througli an unfinished ooe- 



cium. The crj'ptocyst, which rises from the 

 distal wall, is incorrectly drawn as connected 

 witli the membranous endoooecium. (see pi. 

 XXIV, fig. 12). X 40. 



Plate XIII. 



Fig. 7 d. 



— 7 ( 



— 7 



— U 



— 71 



8 b. 



— 9 



9 c. 



— 9d. 



— 9e. 



— 9 f. 



— 9g- 



— 9h. 



— 9 i. 



— 9j. 



A sagittal section through an ooecium of the 

 same species. Here also the cryptocyst is 

 drawn as connected witli the endoooecium. 

 ekto — the ectoooecium; endo — cryptocj'st 

 together with the endoooecium. X 40. 

 An ooecium of the same species, lateral view. 

 X 40. 



An undeveloped ooecium of the same species, 

 from the frontal surface. X 40. 

 An ooecium of the same species, from the 

 basal surface. X 40. 



A transverse section tlirough 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 Onchoporella) bicor- 

 nis Wyv. Th. The one half of the distal wall 

 of the lowermost pair of zooecia is seen and 

 also two of the internal oval rosette-plates, 

 through which the stalk-like proximal end 

 of a pair of zooecia is in communication 

 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 zooecia is seen from the distal end, 

 and also the forked distal walls and four 

 intersected stalk-like proximal parts. X 55. 

 A transverse section through a branch of 

 the same species, approximately through the 

 middle of the wider distal part of a pair 

 of zooecia. X 55. 



Onchoporella bombgcina (Busk). X 40. 

 A sagittal section through two zooecia of the 

 same species with ooecla. ekto — the ecto- 

 ooecium. The cryptocyst removed. X 40. 

 A sagittal section through two zooecia, fur- 

 nished with radical fibres. The one descend- 

 ing part of the distal wall is seen. X 40. 

 Two zooecia of the same species with radical 

 fibres, from the basal surface. X 40. 

 A part of the margin of a colon}'. X 40. 

 Zooecia of the same species with developing 

 ooecia. X 40. 



Transverse sections of two zooecia and of a 

 kenozooecium. X 40. 

 The first beginning of an ooecium. X 40. 

 Developing ooecium, a little older. 

 Developing ooecium, in which the basal sur- 

 face of the cryptocyst is almost formed. 

 X 00. 



