;J76 



Plate VI. 



Fig. 1 a. 



— 2 a. 



— 2 b. 



— 3 a. 



— 3 b. 



— 3 c 



— 3d. 



— 5 b. 



— 6 a. 



— 6h 



— 6 i 



Crnleroporn falcala n. ,sp. X 23. 

 Sipl}nnoi>orella noilosii llincks. X 40. 

 The same speeics from the basal surface. 

 X 40. 



Siphonopnrclla delicalissima (Busk). The 

 covei'iiij; nuinbrane is removed. X 40. 

 A zod'chim of the same species, more highly 

 magnified. X ".">. 



A ziKvcium of the same species. As a great 

 pari of the frmilal cryptocyst has been re- 

 moved, the proxinially directed ])art of the 

 polyjiide tube can be seen. X 75. 

 The same species from the basal surface. 

 Tile polypidc lul)e is visible. 

 Labioponi creniilata n. sp. X 23. 

 Thalamoporellii iirdntilala. var. stapifcra n. 

 X 40. 



A gonozod'cium of the .same s])ecies, the 

 oiccium of wliich has been removed. X 40. 

 Spicula of the .same form. X 200. 

 Two zooccia of the same form, seen from 

 the basal surface. 

 A <listal wall of the same form. 

 Thalamoporella Hozieri (Aud.), var labiata n. 

 X 55. 



The same form, from the basal surface. X 40. 

 A zoceeiuni of the same species, from that 

 lateral surface which is nearest to the deep- 

 est opesiular outgrowth. X 40. 

 A zocecium of the -same species, from the 

 other lateral surface. X 40. 

 The distal end of a young zocecium of the 

 same form. The lip is not developed. X 55. 

 The distal end of an older zocecium with a 

 fully developed lip. X 55. 

 The distal end of an older zocecium with 

 operculum. X 55. 



The operculum of the same form. X 100. 

 A distal wall of the same form, which is 

 exceptionally furnished with two multi- 

 porous rosette-plates. X 40. 



Fig 6 j. A distal wall of the same form with a single 

 multiporous rosette-plate. X 40. 



— 6 k. Spicula of the same form. X 200. 



— 7 a. ThitUimoporcUa lioticha (Ortm.). X 23. 



— 7 b. The distal end of a zocecium of the same 



species. X 40. 



— 7 c. Spicula of the same species. X 200. 



— 7 d. A series of zocecia of the same species with 



o(ecia, lateral view. X 23. 



— 7 e. A Scries of zocecia of the same species with 



(xecia, fnun the frontal surface. X 23. 



— 7 f. A gouozoa-cium of the same species, with 



developing ocrcium. X 40. 



— 7 g. A schematic longitudinal section through 



the distal end of a gonozo<ecium with ote- 

 cium of the same species. 



— 7 h. .-Vn (xeciuni of the same species; as its frontal 



half is cut away, the operculum of the gono- 

 zod'cium can be seen. I.owcrniost the pro- 

 truding od'cial ojierculum. X 40. 



— 7 i. The same species from the basal surface 



The descending cryptocyst divides the zo<e- 

 cium into a smaller distal chamber and a 

 larger proximal. The basal wall shows in 

 every zocecium a uniporous losette-plate or 

 a corresponding opening. X 23. 



— 7 j. A zoiecium of the same species, from one 



of the lateral surfaces. X 23. 



— 7 k. A zocecium of the same species, from the 



other lateral surface. X 23. 



— 7 I. An avicularium of the same species- X 40. 



— 7 m. A distal wall of the .same species. X 40. 



— 7 n. A gonozo<Ecial operculum connected with 



the appertaining (xecial operculum. X 40. 



— 7 o. The same two opercula in another position. 



X 40. 



— 7 p. The distal end of a zocecium of the same 



species after the removal of the basal sur- 

 face. The independent basal wall of the 

 polypide tube is seen. X 40. 



