BY C. T. PLAYFATR. 661 



smooth or armed beliind with a circle of spines, in number 1 to 

 5, generally 2 or 3. 



Length 64-137, breadth 32-72, orif. 16-36, spines up to 45/x 

 long. 



Everywhere, common. 



This species is liable to be confounded, at first sight, with Eu. 

 acanthophora, in company with which it is often found. The 

 test is, however, more roliust and siliceous, and the segregated 

 plates are unmistakable. It is impossible to discern the shape 

 of the plates in the unbroken test, yet specimens may be recog- 

 nised with a lens of even small definition by one point alone. 

 With the objective a little out of focus, a dark slot, or a pair of 

 minute, circular spots, appears at the top and bottom of each 

 plate; the body-scales are recessed at each end, and only the two 

 minute spikes overlap, leaving a minute foramen on either side 

 The cement-marks also are not thin and fusiform as in Eu. 

 acanthophora, but broad, rectangular slabs. The species is our 

 most common EuglypJia. It has a wide range of dimensions, but 

 a regular series is found connecting its extreme sizes. Body- 

 scales 10x8, 11x7, 11 |x 10/,, 12 X 10/x. I have never seen 

 this species encysted. Cf. Eii. cvpiiulafa Wailes, Frw. Rhiz. fr. 

 the States, p.l47, P1.12, f.34-37. 



Var. ELEGANS, n.var. (PI. xL, f.2). 



Test elliptical or long-ovate, narrowed behind, not hemispheri- 

 cal; sides slightly arched, sometimes a little flattened towards 

 the orifice. Otherwise as in the type. 



Length 67-137, breadth 32-72, orif. 19-36, sp.long 10-45//. 



Auburn (149); Botany (152); Coogee (58); Lismore (308, 312, 

 327). 



In this form, the test is elliptical rather than ovate or oval, 

 and the breadth about half the length, the orifice again being 

 about half the breadth. 



Yar. CYLINDRACEA, n.var. (PL xL, f.3). 

 Test slightly cuneate, nearly cylindrical; dome semicircular; 

 sides straight from dome to mouth, very slightly converging. 



