BY G. 1. PLAYFAIB. 547 



Syn., Dinohnjon clef/antissimiDn G. S. West, Alg. Yan 

 Yean Res., p. 81, iig.lOK. A large number of variations of 

 T/ach. caudata were lately obtained from a plankton-gather- 

 ing in the Parramatta River (fi-esh). The form neai'est to 

 var. elegantissima, is figured in PI. Ivii., f.lO. It is a stipitate 

 Trachelomonas, the tail being the remains of the stipes when the 

 organism breaks away. The size of the specimen figured was 

 long. 34, lat 18 /x. As I have seen no figure of 7V caudata Ehr., 

 nor yet of Tr. acuminata Schraarda, the description of which 

 equally well suits my specimens, I cannot be quite certain of the 

 identification 



Menoidium pellucidum Pei'ty var. inflatum, n.var. 



(PI. Ivii., f.22). 



Forma brevior ; dorso plus arcuato ; rostro angustissimo 

 minuto aut nullo. Long, circa 50 /^i. 



Mallomonas splendens (G. S. West) mihi. 

 (PI. Ivii., f. 12,13). 



Long. Corp. 30-56; lat. 9-13; setce long, ad 36 /x. 



Syn., La(jer]ieitiiia S'jdeiidens G. S. West, Alg. Yan Yean, 

 PI. 6, f. 4-8. 



Found in the plankton (only dead and empty tests, how- 

 ever) in considerable quantity. There is nothing to dis- 

 tinguish the empty test from a Lager hei/iiia. Finding the 

 creature alive (PI. Ivii., f.l2) at Gardener's Road swamps, 

 however, left no room for doubt. The spinous setse, which 

 are capable of a slight amount of lateral movement, vary in 

 number from two to five (six ?) each end, and there are two 

 contractile vesicles, one each side, one-third of the length 

 from the hinder end. In many specimens, the spines were 

 without extended bases, growing directly out of the body. I 

 had felt it necessary, at first, to identify this species with M. 

 litomesa Stokes, Infus. U.S., PI. i., f.32, but he states (pp. 

 92-93), that the cuticular surface is finely crenulate, with 



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