r.Y C. T. PLAYFATR, 645 



front, not pointed, agreeing exactly with the type in Penard, 

 Fauna Rhiz., p. 282; but the orifice has the irregular, pentagonal 

 lobes shown by Cash, I.e., ii., P1.22, f.1-2, whose form should 

 stand as a variation. 



DiFFLUGiA VARIANS Penard, forma. (PI. xxxv., f.ll). 

 Length 133, breadth 7 6, orif. 34, thick 70, processes 16-20/x long. 

 Kyogle(219); Lismore (335). 



Of. Penard, Faune Rhiz., p.241, f.4. Known hitherto onl}' 

 from the neighbourhood of Lake Geneva, in Switzerland. 



DiFFLUGIA LITHOPLITES V PULCHERRIMA, n.var. 



Test much smaller than the type, perfectly spherical, as a rule, 

 but very rarelv somewhat ovate Orifice always beautifully 6- 

 or 7-lobed, the margin edged with small plates side by side, with 

 the chitin darkened towards the edge just as in the type: occa- 

 sionallv, also, the angles are tipped with the clear, sharp- pointed 

 flint mentioned by Penard, but this is not the rule. Generally, 

 there is no turned-up edge to the orifice, but sometimes a very 

 slight rim is present, and very rarely a decided collar, as much 

 as 6//, high. The test is strengthened with minute, fiat plates of 

 irregular shape, but about equal size (2-3/a). The processes are 

 usually wanting, and, when present, very small and inconspicuous. 



Length 70-100, breadth 60-90; orif. 27-42/x. 



Lismore (308, 311, 322). (PI. xxxv., f.l2, 13). 



Cf. Penard, Faune Rhiz., p. 284. A very beautiful species, 

 which is plentiful locally. The lobes of the orifice are not always 

 quite regular, though more so than in the type. A pretty test 

 was noted, composed entirely of circular, nebeloid plates (PI. 

 xxxv., f. 14); sometimes, also, thickened, circular plates, appa- 

 rently with a slight depression in the centre, are interspersed 

 among the small angular ones (PI. xxxv., f. 15). 



DiFFLUGIA LiSMORENSIS, n.sp. (PI. XXXvi., f . 1). 



Test broadly ovate or subglobose, composed of coarse flints 

 closely disposed, or of flat plates of irregular shape (not so small, 

 however, as in the preceding species). Dome broadly rounded, 



