112 Canon A. M. Norman—WNvtes on the 
species. The Mediterranean form generally assumes a 
different mode of growth, that of narrow thongs instead of 
broad fronds, and the sides of the oral opening incline 
inwards in the middle (see Milne-Edwards, ‘ Recherches sur 
les Eschares, pl. i. fig. 1a; Waters, Ann. & Mag. Nat. 
Hist. ser. 5, vol. ui. pl. xv. fig. 8; Hincks, pl. Ixvi. fig. 4= 
Eschara bidentata, M.-Edwards, /. c. pl. i. fig. 2a). I felt 
some doubt whether the Mediterranean and British forms 
should be regarded as one species, but that doubt was re- 
moved when an examination of their respective opercula 
proved them to be absolutely identical, showing that the 
difference in the oral opening was entirely superficial. It 
would appear therefore that our British form must be called 
Eschara fascialis, Pallas. 
Var. foliacea, Ell. & Sol. (=var. lamellosa of Pallas 
and Moll), 
and such of the species of Hincks’s Lepralia as may be 
regarded as congeneric with this species must be styled 
Eschara. 
But had there been no genus Eschara to claim precedence, 
could the name Lepralia have been employed in the sense in 
which Hincks used it, for reasons which I have already given 
under Lepralia, Johnston, = Membraniporella, Hincks? 
Genus Discopora, Lamarck. 
= Umbonula, Hincks. 
Type, Discopora verrucosa, Lamarck. 
Harmer has investigated the organization of this species 
(Quart. Journ. Micr. Sci. n. s. vol. xlvi. p. 293, pl. xv. 
figs. 11, 12), and has placed Mucronella pavonella, Alder, im 
the same genus. He does not refer to the rosette-plates, so 
I may mention that there are only two in pavonella, but four 
which are multipored in verrucosa. 
Genus Poretua, Gray, 1848. 
Type, Porella compressa (Sowerby). 
50. Porella concinna (Busk). 
Varanger Fiord, 120-150 fathoms. 
51. Porella aperta (Boeck). 
1861. Lepralia aperta, Boeck, Forh, Vid.-Selsk. Christiania, p. 50 (fide 
Smitt). 
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