144 ZOOPHYTOLOGY. 



•whilst in L. umbonata its -walls are apparently entire. The 

 umbo on the ovicell, it may be remarked, is merely that be- 

 longing to the cell in front of which the ovicell rises. 



5. L. bella, n. sp. PL XXVII, fig. 2. 



L. cellulis ovoideis, perforatis ; orificio suborbiculari, infra sinuato, dentiat- 

 lum internum bifidum ostendenti ; peristomato, elevaio, subinde incrassato, 

 inermi ; ovicellulis rotundatis perforatis. 



Cells ovate, punctured ; orifice orbicular, with a spout-like sinus below, 

 within which is a rather large, bifid denticle ; peristome raised, often 

 thickened ; ovicell subglobose, punctured. 



Hub. Shetland, Barlee ; on shell. 



This is the species which I doubtfully termed L. Landsbo- 

 rovii, when the account of Mr. Barlce's species was read at 

 the British Association. It is clearly, however, not that 

 species as now understood, however much the figures here 

 given may seem to correspond with that of L. Landsborovii, 

 in Plate LXXXVI, of the ' British Museum Catalogue.' That 

 figure was taken from the only specimen of L. Landsborovii 

 contained in the Johnstonian Collection, and which was the 

 sole representative of the species I had then seen. Since 

 then, however, having received numerous and more perfect 

 specimens, I have been able to determine the characters of 

 the species more precisely; and Fig. 1, Plate CII, of the 

 f British Museum Catalogue/ erroneously referred to L. reti- 

 culata, may perhaps be taken as representing its typical form. 



The differences between L. bella and L. Landsborovii con- 

 sist — 



1. In the absence in the former of the intercellular raised 

 line, and 



2. In the absence of any avicularian organ on the lower 

 border of the orifice. 



From L. reticulata and L. pertusa the differences are too 

 obvious to require more particular notice. 



The other species of Lepralia which occur in Mr. Barlee's 

 collection are — 



6. L. Pallasiana, Moll. 



7. L. bispinosa, Johnston. 



8. L. granifera, Johnston. 



9. L. ringeus, Busk. 



10. L. discoidea, Busk. PI. XXVII, figs. 4, 5. 



The figure of this species, which in some respects closely 

 approaches an Alysidota, was inadvertently placed on the 

 stone, before I remembered that it had been already figured 

 in (< Zoophytology ') PI. XXII, figs. 7, 8, from specimens 



