BY G. I. PLAYFAIR. 643 



Two rare species noted here; C. acule<Ua dund v. eco?'ms common 

 everywhere. 



Difliugina. 

 Genus D i f f l u g i a Leclerc. 



DiFFLUGIA OVIFOKxMIS Cash.* (PL XXXV., f.1-3). 



Length 70-100, breadth 48-68, orif. 25-34/z. 



Botany (15, 37, 144, 145, 152); Botanic Gardens (150); Cen- 

 tennial Park (6, 11,72, 133); Lismore(188, 260, 285). 



Cash, I.e., ii., p.52, PI. xx., f.8-12; not Leidy, Rhiz. U.S., PI. 

 XV., f. 16, 17, as given by Cash {=D. lohostotna forma). Only 

 known hitherto from a single locality in England, but one of our 

 most common and wide-spread Difflugise here. The figure given 

 by Cash leaves nothing to be desired, except that he does not 

 figure the plating of the test, which he gives as "elongated 

 rectangular scale-like particles." In our specimens, the test is 

 almost always formed of a mosaic of small, irregularly-shaped, 

 angular plates embedded in a cement, which gives the test a 

 reticulate character, like the skin of a rock-melon. The test 

 also has a tendency to be more cuneate than ovate, with sides 

 flattened towards the mouth. The orifice is always 3-lobed; I 

 have never seen it otlierwise; rim entirely chitinous, ( x 3/x) broad. 

 Very rarely, specimens may be seen with a rim uncoloured, not 

 projecting, and inconspicuous; and sometimes the points of the 

 three lobes of the orifice project upwards. (PI. xxxv., f.3). 



Forma. (PI. xxxvii., f.l). 

 Test composed of grains and rectangular spicules, with a 

 number of large, circular, transparent, nebeloid plates, some dis- 

 tance apart, towards the hinder part of the test. The general 

 substance of the test seems to resemble the British specimens. 

 An unusual form. Size 63 x 55, orif. 21//. Lismore (337). 



Var. MOLLIS, n.var. (PL xxxv., f. 4). 

 Test delicate, apparently entirely chitinous, without plates or 



* I am morally certain that this isZ). ^r?c««pis Carter (c/. Cash, I.e., p. 48, 

 f.64), but, as the very distinct, chitinous collar has been omitted from his 

 figure, it is impossible to prove it. It is the only Difflwjia of its size, 

 which is transparent enough to show the details of the Ijody within. 



