ON RECENT POLYZOA. 547 
Genus 43. Setosella, Hincks, ‘ Brit. Mar. Pol.’ p. 180 
= Membranipora (pt.), Busk 
= Cnupularia (part), Smitt, ‘ Florid. Bryoz.’ ii. 14 
= Setosella, Hincks, ‘ Ann. Mag. Nat. Hist.’ 1877 
= Setosella. Referred to only ‘Chal. Rep.’ p. 70. 
‘Zoarium incrusting. Zocecia with raised margins; front depressed 
‘and wholly calcareous; aperture semicircular. Vibracular cells alter- 
nating with the zocecia throughout the colony, Vibraculum slender and 
setiform.’—Op. cit. p. 180. 
Setosella vulnerata, Busk (‘ Brit. Mar. Pol.’ p. 181, pl. xxi. fig. 7) 
= Membranipora id., Busk, ‘Quart. Jour. Mic. Soe.’ viii. pl. xxv. 
fig. 3, Norman. 
rs Shetland dredgings, ‘ Brit. Assoc. Rep.’ 1867, 
p- 305 
= Setosella vulnerata, Hincks (‘ Ann. Mag. Nat. Hist.’ 1877). 
Family XIII. Electrinide, Busk 
. = Electrinidx, D’Orb., 1851, ‘ Palzon. France,’ p. 329 
7 = Membraniporide (pars), Avwett. 
q 
_ ‘Zoarium erect or incrusting, more or less flexible or sub-testaceous. 
Zowcia turbinate or sub-turbinate. Wall punctured. A wide expanding 
aperture, the border toothed or furnished with chitinous or aculeate spines. 
ine or more chitinous spines, of larger size than the rest, articulated on 
the front of the zocecium below the aperture, or an articulated avicularian 
process in the same situation. Ocecia when present galeate.’—Chal. 
Rep. p. 78. 
¢ Genus 44. Electra, Lamourouz. 
Character: That of the family. 
_ This family seems to be founded upon two well-known types of 
-olyzoa : the not too well-known Electra verticillata (Lamx.), and the well 
‘known and widely distributed Electra (Membranipora) pilosa (Linn.). 
_ In his ‘ Brit. Mar. Pol.’ (p. 137) Mr. Hincks places the M. pilosa 
with the group having a membranous front wall, but he does not make 
any remarks upon the species as being probably taken as the type of any 
new family, although from the very full list of synonyms furnished by 
him a doubt as to its future location may have arisen in his mind. Three 
varieties are described in the ‘ Brit. Mar. Pol.’ which will be mentioned 
in their proper place. In the ‘Chal. Rep.’ only one new species is 
described, but Mr. Busk suggests that perhaps four or five described 
‘forms may be included in the genus, as here defined. 
4 1. Electra cylindrica, Busk, ‘Chal. Rep.,’ pl. xxxiii. fig. 2,not EL. cylin- 
‘ drica, D’ Orb. 
m2. » Ppilosa, Linn. (see ‘ Brit. Mar. Pol.’ p. 137). 
p Var. a, dentata, Hincks (op. cit. p. 187). 
ms » [, laxa, Smitt (op. cit. p. 137). 
» Y; Pallas (op. cit. p. 138). 
»  verticillata, Lamz., ‘Flexible Coralines.’ 
»  triacantha, Lame. 
»  bellula, Hincks. 
» (?) distorta, Hincks. 
O gr ph o0 
NN2 
