392 



Plate XI. 



Fifj. 1 a. Sriilicella /ilnqinslDiua (Husk). The lateral 

 chambers arc funiislied with their niembra- 

 MDUs walls. X 23. 

 1 h. .\ hi-zou'cial internode of the same species, 

 from the ba.sal surface. 15etween the two 

 zoieeia uppermost the adzo<ecial supra- 

 scapular chamber of the mothcr-zodcium 

 and lowei-most its adzodcial pedal chamber. 

 The scapular and the infra-scapular cham- 

 bers are united or incompletely separated. 

 X 40, 



— 1 c. The zod'cium which arises from the mother- 



zo(ecium of the bi-zoiccial internode, from 

 the basal surface. The floor of the two 

 supra-scapular chambers is seen uppermost, 

 whilst the membranous cover is removed. 

 The latter is seen in li^ 1 a. The two infra- 

 scapulai' chambers are also shown. X 40. 

 1 d. .V part of the same zo(eeinm, from the sur- 

 face furnished with the small avicularium. 

 The infrascapular and the pedal chambers 

 are seen. X 40. 



— 1 h. A part of the same zoiecium, from the sur- 



face furnished with the large avicularium. 

 The infrascajjidar chamber (on the basal 

 surface) is seen and also the pedal; to the 

 lell of the tip of the avicularium the floor 

 of the supra-seapular chamber. X 40. 



— 1 e. The dau(;hler-zo(eeium of a bi-zocecial inter- 



node, from the e.\ternal surface. Uppermost 

 the unseparated distal chambers tlic scapu- 

 lar and the infrascapular), and under them 

 the pedal chamber of the dauf«htcr-zoiecium 

 and the adzoiecial pedal chamber of the 

 niotherzoiecium. (sec fig. 1 b.). X 40. 



— 1 f. The mother-zo(ecinm of a bi-zo(vcial inter- 



node. I'ppcrmost the two unseparated cham- 

 bers and under these the pedal chamber. 

 X 40. 



— 1 g. The zoirciuni which arises from a daughter- 



zoiecium, from the internal surface (i. c. 

 opposite an avicularium) (see fig. 1 a.) Up- 

 permost the distal unseparated chambers 

 and below^ the pedal. X 40. 

 The same zoiecium, fiom the other surface. 

 The corresponding chambers are seen. X 40. 

 A sagittal section through a zocecium of 

 Siiiticrllii i>l(iijiosloni(i (Busk,!. The angularly 

 bent distal wall d. w.) and the cryptocyst 

 plate ic. pi.) are seen. X 40. 



1 k. A gonozocecium of Cat. playioslonia. var. 

 sclifera. X 2.3. 



1 1. A gonozoeccium of the same form, lateral 

 view. X 2.3. 



1 m. .\ gonozocecium of the .same form, from the 

 basal surface. X 23. 



1 j. The separating wall between the covering 

 kenozoa-eium and the small spinous ba.sal 

 chamber. X 40. 



— 1 



— 1 



1-ig. 1 



— 2 b. 



2d. 



— 2 f 



3 a. 



— 3 b. 



4 a. 



4 b. 



— () 



An old bi-zo<ecial interiu)de of Sriilirella 

 plnrjioslonid, v. sclifera. The aperture is clos- 

 ed by a calcified plate, and this is further 

 connected with a cryptocvst which is placed 

 inside the sternal area and may finally form 

 a continuous cover inside the last. X 40 

 Another old bi-zo(ccial internode of the 

 same form. X 40. 



A zo(ecium of Sciilicclht Wilsoiii (Mac Gil- 

 liv.l On each side of the sternal area a large 

 infra-scapular chamber is seen. c. pi. crypto- 

 cyst plate. X 40. 



A zo<eciuni of the same species, lateral view. 

 To the left the infrascapular chamber and 

 to the right the supra-scapular and the 

 pedal. X 55. 



A zod'cium of the same s|)ecies, from the 

 basal surface. The whole basal surface is 

 occupied by the supra-scapular and the 

 pedal chambers. X 55. 



The proximal end of the sternal area of the 

 same species. The bridge between the two 

 central fenestra; is not yet completed and 

 its end is uncalcificd. X 75. 

 The same part of a third zo<ecium. I'lie 

 bridge between the two fenestra- is for the 

 most part uncalcificd. X 75. 

 A zo(ecium of Scaticclla amphora (Busk), 

 lateral view. To the left the infra scapular 

 chamber, to the right the supra-scapular 

 and the large pedal chamber. X 55. 

 A zoiecium of the same species, from the 

 basal surface. The supra-scapular aiid the 

 pedal chambers are seen. X 55. 

 A zo(eeium of the same species with a very 

 large avicularium. To the left the supra- 

 scapular and the Infrascapular chambers. 

 X 55. 



A zoiecium of Srtit. urniiln iMac (iilliv ). 

 lateral view. The supra-scapular, the infia- 

 scapnlar and the pedal clianibers arc seen. 

 X 55. 



.\ zixccium of the same species, from the 

 basal surface. The same three chambers are 

 seen. X 55. 



A gonozo(rcium of .Sciil. maniarilacea (Busk). 

 X 40. 



The same gonozott-cium, lateral view. X 40. 

 The same gonozo(rcium, from the basal sur- 

 face. X 40. 



A gonozocecium of Seal, ivnlrirosa (Busk). 

 X 40. 



The .same gonozoieeium, lateral view. X 40. 

 A gouozoa-cium of Scut, maculata (Busk). 

 X 23. 



The same gonozoa'cium, lateral view. X 23. 

 The sternal area of the gonozoivcium and 

 the two spines, more highly magnified. The 

 small cryptocyst plate is .seen. X 40. 



