BY G. I. PLAYFAIR. 



31 



Trachelomonas acuminata var. amphora, n.vai 



Lorica, ut in forma typica, corpore inferne 

 latissimo sed lateribus late-rotundatis nee angir 

 latis, ad collum sensim convergentibus. 



Long. 46, lat. 28 ; coll. alt. 8, lat. 6 ; caud. 

 long. 6/x. 



Parramatta 136. 



Like the type, 7V. acumiiiata (Schmarda) 

 Stein, I.e., f.43, this form is smooth and broadest 

 below, but it is regidarly rounded at the sides, 

 not angular. Also it shows the square neck 

 with everted rim which is characteristic of these 

 tailed varieties of Trachelomonas. Schmarda's 

 form has an obliquely sliced-oif neck. The figure 

 given by Stein measures 55 x 32 /x. 



(Pl.v.,f.3). 



Fig. 10. 



Tr. acuminata 



(Sciimarda) Stein, 



X 650, after Stein. 



Trachelomonas urceolata Stokes, forma, (PI 



Forma longior, corpore inferne modice attenuato; 

 collo paullo oblique truncato; cauda paullulo ob- 

 lique protracta. 



Long. 54, lat. 20; coll. alt. 8, lat. 4; caud. long. 

 15/x. 



Parramatta 136. 



Cf. Stokes, Frw. Infus. U. S., p.89, PI. i.,f. 26. 

 This is merely an irregular (probably growing) 

 form of the type. The latter has an oblong body, 

 not tapering to either end, with somewhat flattened 

 sides. Size 44 x 20, Stokes. 



f.4), 



Fig.ll. 

 Tr. urceolata 



Stokes, 

 after Stokes. 



Var. ovALis, n.var. (PI. v., f.5, 6). 



Forma corpore ovali nee oblongo, lateribus rotundatis nee 

 deplanatis; collo breviore, ore modice everso; cauda brevi inter- 

 dum brevissima. 



Long. 34-37, lat. 22; coll. alt. 4-6, lat. 6; caud. long, ad 6 /x. 



Parramatta 136, 165, 166. 



The tail in this form is only about one-third the usual length, 

 and is sometimes reduced to a mere broad, triangular projection. 



