| ON RECENT POLYZOA. 581 
Family Myriozoide, Hincks. 
Genus 53(?). Rhynchopora, Hincks. 
‘Zocecia with the primary orifice transversely elliptical, lower margin 
slightly sinuated; secondary orifice sub-orbicular, with a mucro on the 
lower margin and an uncinate process immediately above it within the 
mouth. Zoarium (in the British species) incrusting.’—Brit. Mar. Pol. 
p. 385. 
1. Rhynchopora bispinosa, Johnston, op. cit. p. xl. figs. 1-5. Loc. : Ber- 
wick Bay ; South Devon (abundant) : Cornwall ; 
Guernsey ; Shetland; Caithness (very rare) ; Ma- 
zatlan ; Adelaide. 
2. mn longirostris, Hincks, ‘Annals,’ May 1881. Captain 
Warren’s collection. 
Genus 54 (?). Schizotheca, Hincks. 
‘ Brit. Mar. Polyzoa,’ p. 283. 
1. Schizotheca fissa, Busk, ‘ Brit. Mar. Pol.’ p. 284, pl. xli. figs. 1-38. 
2. 4 divisa Norman, op. cit. p. 385, pl. xli. figs. 4-6. 
3. RS fissurella, Hincks, ‘ Annals,’ 1882, ‘ Polyzoa of Queen 
Charlotte Islands.’ 
Genus 54*, Mastigophora, Hincks. 
(See Genus 62 of Report, and ‘ Brit. Mar. Pol.’ Hincks, p. 278.) 
1. Mastigophora Dutertrei, Aud. ‘Brit. Mar. Pol.’ p. 279, pl. xxxvii. 
figs. 15/2. 
2. Hyndmani, Johnston, op. cit. p. 281, p. xxxvii. figs. 3-6. 
3. _ ” var. ensiformis (MS. ? Miss Jelly). 
A 
0 »» porosa, Pourtales. 
Family XXII. Adeonez, Busk, ‘Chal. Rep.’ p. 177. 
*Zoarium erect or (rarely) incrusting, affixed either by a more or less 
flexible or unjointed, radicate, chitino-calcareous peduncle, or immediately 
attached to some flexible body, either with or without a contracted base. 
Bilaminar except when incrusting ; foliaceous, expanded, and fenestrate, 
or branched, or lobate, or entire. Cells of two or usually three kinds, 
zocecial, ocecial, avicularian. No ocecia of the usual type. On the front 
a@ median pore, usually simple and circular, sometimes irregularly 
fimbriate, or represented by a depressed perforated areola. Usually one 
or more sessile avicularia on the front. In the ocecial cells the pore in 
most cases is sub-oral, or placed immediately below the mouth, and usually 
@ minute avicularium on each side. The wall of the zocecial cells is 
punctate or entire; that of the occial always punctate.’—Loc. cit. p. 177. 
This important family group is founded upon well marked structural 
peculiarities :-— 
1. The existence of three distinct forms of cells. 
2. The entire absence of ocecia of the usual type. 
3. The presence of a median pore or its equivalent. 
_4. In the presence of avicularian cells, which are wholly converted into 
“vicarious avicularia.’ 
