BY G. I. PLAYFAIR. 647 



DiFFLUGiA HELVETICA var. LiTHOPHiLA (Peiiard) mihi. 

 Length 60, l)readt)i 55; orif. 34/x. Syii., D. hydrostatica Zsich., 

 V. lifhophila Penard, Faiine Rhiz., p. 274. The latter identities 

 D. hydrostatica Zach., witli D. urceolaia v. helvetica Heuscher, 

 the priority of which he recognises, but without adopting the 

 name. Penard gives 100-140 long for Swiss specimens; the only 

 example I have seen agreed in size more with D. brevicolla Cash, 

 whose likeness to this species I have already remarked on, c/!, 

 Cash, /.c, p. 38, f.55. According to Penard, D. cyclotellina 

 Garbini, differs only in a test garnished entirely with CycJotella 

 frustules; it is not improbable, therefore, that D. Casinoensis 

 Playf., Biol. Richm. R., p. 142, PL viii., f.9, may be identical 

 with that form; I have not seen Garbini's figure or description. 

 (PI. xxxvi., f.5). Lismore(327). 



DiFFLUGiA CONSTRICTA (Ehr.) Leidy. 

 Length 55-72, breadth 39-57; orif. 21-31// high. 

 Coogee(14); Botany (1 7, 155). 



Yar. SPINIFERA, nom.nov. (PI. xxxvi., f.6). 

 The spinous form. Length 87, breadth 72, spines 20/x. 

 Coogee(14). 



DiFFLUGiA UHCKOLATA Carter. 

 Length 180-210, breadth 150-152; orif. 95/i. 

 Auburn: Wyrallah; Lismore (314, 335). 



Var. AMPHORA Leidy. 



Rhiz. U.S.A., PI. xvi., f.54. Z>. amphoralis Hopkinson in 

 Cash, ii., p. 43, P1.2], f.l3. It is impossible to draw any specific 

 distinction between forms that are rounded behind and those 

 that are acuminate. 



Length 200, breadth 158; orif. 1 16/x. Lismore (311). 



Var. SPHiBRiCA, n.var. (PL xxxvi., f.7). 

 Test spherical, not oval or ovate, orifice furnished with the 

 usual collar. 



Length 275, breadth 275, collar 200, constr. 175, neck 50/x high. 

 Lisipore (260). 



