414 



Plate XXII. 



Fig. 1 a. FUisIra (Rctipiislra' reticulum Hincks. X 23. 



— 1 b. A zod'ciiiin of Uio .same specks with ofrei- 



um, lateral view. X 40. 



— 1 c. The same species from the basal surface. 



The uppermost /.(Hreium in the central row 

 is lurnishetl with an (Hceium. X '2-i- 



— 2 a. Flustra Helipusira eriliriformis Husk), fvom 



the ba.sal surface. The two uppermost zou;- 

 eia with o(ecia. X 40. 



— 3 a. Otniclwrclhi sp. The two uppermost zofccia 



with od'cia. X 40. 



— 3 b. A zod'cium of the same species with ooe- 



cium. In the covering membrane of the 

 aperture is seen a simple chitinized oper- 

 euhun, and in each of the two sinuses of 

 the aperture the end of a parietal muscle. 

 X 55. 



— 3 c. The same species. A zoa-cial operculum, 



above which an o(ccial operculum. X 7o. 



— 3d. An aviculariau mandible of the same spe- 



cies. X 40. 



— 4 a. F.leclni angulalii n. sp. X 40. 



— 5 a. Mcnthranipora liiuosa Waters. X 55. 



— 5b. The distal wall of the same species with 



the peculiar spine-like processes. X 55. 



— 5 c. A spinc-likc process more highly magnified. 



X 200. 



— G a. iVc///(i simplex r?; Busk, from Mauritius. 



The distal part of the ocecium is furnished 

 with a cryptocvst belt. X 40. 



— 7 a. Thtiltimoiiorcllti cinclii Hincks'. X 40. 



— 7 b. The saiue species, lateral view. The distal 



wall and the one opesiular outgrowth are 

 seen. X 40. 



— 7 c. A transverse section through a zoa'cium, 



distally to the two large swellings and view- 

 ed from the distal end. The two swellings 

 and one of the opesiula- are seen. X 40. 



Fig. 7d. The operculum of the same species. X 100. 



— 8 a. (Aihcriella licnemunilo (Uusk). X 55. 



— 8 1). The same species from the basal surface. 



A transvcrselv placed vibraculum is .seen. 

 X 55. 



— 9 a. lUiplopoma imprexsum (Moll), with primary 



zod'cium. In the margin of the zooecia in- 

 ternal pore-chambers are visible. X 55. 



— Ob. The opercuUini of the primary zonccium. 



X 140. 



— 10 a. Haplopouut bimucronalum (^MoUi, with pri- 



mary zo(ccium. X 55. 



— 10 b. Operculum of the same species X 14(1 



— 10 c. Operculum of the primary zoicciuni of the 



same species. X 140. 



— 11a. Operculum of I'orelhi (?) cornutd u sp. 



X 75. 



— 12 a. A developing odciuin of Smilliim Smilli 



(Kirchcnp). The development of the crypto- 

 cvst of the distal zou'cium has begun. 

 X 40. 



— 13 a. Tnjposlega vcnuslii (Norman). Three small 



dwarf-zoa^cia are seen and a larger wliioli 

 surrounds an (xecium. X 40. 



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



species. X 75. 



— 13 c. .\n operculum of the same species. X 75. 



— 13(1. The aperture of a dwarf- zoiccium with 



operculum. X 200. 



— 14 a. An o(fcium of Sclenulomus (Icniicnhilux 



(IJusk;, and its surroundings, seen from the 

 frontal surface. X 40. 



— 15 a. A zodcium of Fsrluirella imuicma Flcm. 



var. with developing o(ccium The part com- 

 mon to the zooeciuni and the endooivcium 

 (the 1 basal mark«) is seen. X 40. 



