112 Canon A. M. Norman — Notes 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 

 invvards in the middle (see Milne-Edwards, ' Recherches sur 

 les Eschares,' pi. i. fig. \a; Waters, Ann. & Mag. Nat. 

 Hist. ser. 5, vol. iii. pi. xv. fig. 8; Hincks, pi. Ixvii. fig. 4 = 

 Eschara bidentata, M.-Edwards, /. c. pi. iii. fig. 2 a). 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 

 un&ev Lepralia, Johnston, = Membraniporella, Hincks? 



Genus Discopora, Lamarck. 



= Uynhunula, Hincks. 



Type, Discopora verrucosa, Lamarck. 



Harmer has investigated the organization of this species 

 (Quart. Jo'urn. Micr. Sci. n. s. vol. xlvi. p. 293, pi. xv. 

 figs. 11, 12), and has placed Mucronella pavonella, Alder, in 

 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 Porella, Gray, 1818. 

 Type, Porella compressa (Sowerby). 



50. Porella concinna (Busk). 

 Varanger Fiord, 120-150 fathoms. 



51. Porella aperta (Boeck). 



1861. Lepralia aperta, Boeck, Forh. Vid.-Selsk. Christiauin, p. 50 {fide 

 Sinitt). 



