412 



Plate XXI. 



clKimber is 

 ci\ iiulMi'iiim. 



li I". 

 7:i. 



7 1). 



l-'ig. 1 a. Catenariti mi I lie l'l:ite VillittitclUi corniila Fi^ 

 (Bu,sk\ III till' l)i/(i(i'cial intt'iiKide the niotli- 

 cr-zoa?cial, small, oval, iiifVasiapuhir i-liani- 

 ber is seen (in Hie houiitlan lietwceii the 

 mother- ami the (laufihtei-zocveium. X 5."). 



— '2 a. Catenaria Villalicclhi) I'leyans (Husk). The 



siipra-sea|nilar, the inlVa-.sea pillar and the 

 pedal ehamhers arc .seen. A honndary cham- 

 ber (m. III.) between the mother- and the 

 daughter-zod'eiiim. X 55. 

 - .'i a. Calvnoria formosa (Busk). The same eham- 

 bers as in lij>. 2 a. X 40. 



— 4 a, I'terocella aliiUt (Wyv. Th. The iiKilher-zou;- 



cial, lissure-like iiil'raseapular 

 seen proNiiiKillv to the small 



X 40. " — 7 d. 



."> a. A /oreeium of f.'(///)ir/ii/;;i /)o;i(/(r«si(Hi (ioldst. 

 The internal eiyptoeyst plate is seen and a 

 strong crvploevst formation in the live fene- 

 str:e. X 55. " — 7 e, 



— 5 b, A zoa'cium of the same species, lateral view. — 7 f 



The supra-scapular ehamber is seen and also 



the infra-seapular and the pedal. X 10. — 8 a 



— 5 c. .\ bizoiecial Internodc of the same species, 



from the basal surface. The upi)ermost tri- — «b. 

 angular cavity is the aclzoceeial supra-.scap- 

 ular chamber of the mothcr-zuiecium. To the — .S 

 left is seen a supra-scapular, an infra-scap- 

 ular and a pedal chamber; to the right the — <Sd, 

 pedal chamber is on the other band not vi- 

 sible; the infra-scapular is on this side divided 

 into two. X 40, — 8 f. 



— 5 d. A zoa-eium of the same species, from the 



basal surface. The sufra-scapular and the — 8 g. 

 infra-scapular chambers are seen. X 40. 



— 5 e. A bizooecial internode, from the distal end, 



X 23. — 9 a. 



— 6 a. Strophipora Ilarveiji iWyv, Th,). The supra- 



scapular and the infra scapular chambers 

 are seen. X 40. 



— 6 b. A bizooecial internodc of the same species, — 9 b. 



from the basal surface. The four pedal cham- 

 bers arc seen, X 40, — 9 e. 



— 6 c. A zooecium of the same species, from the 



frontal surface. X 40. 



— 6d. A zocEcium of the same species, from the 



basal surface. X 40. — 9d. 



— G e. A zotcciuni of the same .species, lateral view, — 9 e. 



X 40. 



.\ bizcxccial internodc, IVcim the disUil end. 

 X 55. 



llippoiboa iinntilaris (.Moll), with oiecia. On 

 the boundary between the zoa'cia in the 

 pro.vimal row porc-cbamhers are seen for 

 communication with eventual gonozod'cia. 

 X 23. 



The distal end of a zocvcium of (lie same 

 species, X 75. 



A zoiecium of the same species, lateral view. 

 Three boles are seen for conimnnication 

 with tiie pore-cbanibers in a neighbouring 

 zod'cinm and two pore-chambers for the 

 communication with eventual gonozocccia. 

 X 55. 



A zotreiiim of Hie same species, from the 

 basal surface. On each side of the angularly 

 bent distal wall the entrance to a large 

 pore-cbambcr is seen, X 55. 

 The operculum of the same species. X 75. 

 Opercnlum common to the gonozod'cium 

 and oo-cium >; 'JOO. 



Ilippolhoti lorntilii Husk;, var. holnxtoiiKt n. 

 X 40. 



A zoicciiim of the same form with oiceium. 

 lateral view. X 40. 



A zoiL'cium of the same form, from the 

 distal end. X 75, 



.\n operculum of the same Ibrm. X 200. 

 Four zoircia of the same form, of which two 

 with orecia. X 40. 



Operculum common to the gonozoireium and 

 otecium. X 75. 



A zotecium of the same form, lateral view. 

 The acropctalous spine has an internal sep- 

 tum. X 55. 



An ooecium-bearing zooQcium of Ilippothoa 

 cornuta (Husk), var, aporosa n. lateral view. 

 The acropctalous spine has two cavities divi- 

 ded by an internal se))tum. X 40. 

 .\ zou'cium of the same form, from the dis- 

 tal end. X 75. 



Three zooccia of the same form, of which 

 two with Odcia. The latter are distinctly 

 visible through the surrounding kcnozocccia. 

 X 40. 



An operculum of the same species, X 200. 

 Operculum common to the gonozoircium 

 and ooccium. X 200. 



