ON RECENT POLYZOA. 543 
ifice surrounded by a chitinous border ; oral valves furnished with a 
stinct fringe. 
Euthyris obtecta, Hincks (op. cit. pl. vii. fig. 3). Loc. : Australia. 
4 Macgillivray recently constituted a genus under the name THATROPORA, 
— Macgil., for a parallel group amongst the Membraniporide, and Mr. 
 Hincks says, ‘ we must recognise here the characters of a generic group, 
_ inwhich Carbasea episcopalis, Busk, and C. bombycinna, Ellis & Solander, 
will rank, as well as the species E. obtecta, Hincks.’ As a set off against 
this it will be seen that Mr. Busk—‘ Challenger Report ’—places these 
Species in new divisions. 
iE Family XII. Microporide, Busk 
= ‘Challenger Report,’ p. 70 
= Microporide (pars), Smitt, Hincks 
= Membranipora (pars), Authors. 
‘The much depressed front of the zomcia beneath the chitinous 
epitheca, wholly occupied, except at the summit, by a strong calcareous 
lamina, usually perforated or fissured on the sides, and sometimes form- 
_ ing a transverse diaphragm, which divides the cavity of the zocecium 
into two chambers.’—Op. cit. p. 70. 
> 
Genus Micropora, Gray. 
F Vineularia, Defrance. 
Steganoporella, Smitt. 
Caleschara, Macgillivray. 
»  Diplopora, Macgillivray. 
»  setosella, Hincks. 
” 
”? 
” 
A 
2 
3. 
mr 4. 
5 
6 
Genus 38. Micropora, Gray 
____ = Membranipora (pars), ‘ Brit. Mus. Catalogue ’ 
= Lepralia (sp.), Norman; Steganoporella (sp.), Hincks 
_ = Reptescharellina (pars), D’Orb. 
a: ee: i dh Fic 
_*Zoarium incrusting. Zoccia with an internal calcareous lamina 
_ occupying the entire area, with a perforation at each upper angle below 
_ the orifice, which is apical, with a continuous calcareous peristome.’— 
_ Chal. Rep. p. 70. 
‘1. Micropora uncifera, Busk, ‘Chal. Rep.’ pl. xv. fig. 7. 
2. coriacea, Hsper, ‘Chal. Rep.’ p. 71. 
These are the only two species of this genus in the 
‘Challenger ’ collection. 
” 
In his ‘ British Marine Polyzoa,’ Mr. Hincks describes two species 
only. 
3. 
Cs ee 
Micropora coriacea, Esper, op. cit. p. 174, pl. xxiii. figs. 5-7. 
complanata, Norman, op. cit. pl. xxiii. figs. 8, 9 
= Lepralia, id., ‘ Ann. Nat. Hist.’ 1864 (Norman) 
= Membranipora, Smitt, Manzoni. 
»” 
—— i - 
M. coriacea, var. Hincks, ‘Polyzoa Bass’s Straits.’ ‘ Avicularia 
are more freely developed than in British speci- 
mens. 
