793 



PERIDINEAE OF NEW SOUTH WALES. 



By G. I. Playfair. 



(With Plates xli.-xliii. and 19 Text-figures.) 



No definite effort was made to collect the species of Peridineae 

 which form the subject of this paper; they are merely such as 

 happened to be occluded in various gatherings made principally 

 for freshwater algas. Nevertheless a very fair representation has 

 been obtained and most of the forms noted have been confirmed 

 from several localities. Only two districts have been worked, 

 viz. Sydney and Lismore in New South Wales, but with regard to 

 these minute organisms, forms observed in one district are certain 

 to occur under similar conditions wide-spread throughout the 

 State. Corroborative evidence has been admitted in some cases 

 from Brisbane, Queensland, but only one variety not yet found 

 here has been mentioned viz. Peridinium umbonatum var. inae- 

 quale Lemm., a single cell of which was found in a Brisbane 

 sample . 



Altogether 39 varieties have been listed, distributed thus : — 

 Hemidinium 1, Gymnodinium 4, Glenodinium 3, Peridinium 27, 

 Ceratium 1, Exuviella 3. Figures of all forms are given (from 

 Australian specimens) except in the case of Ceratium hirundinella 

 and Gym. aeruginosum. 



Types. — Owing partly to inexperience, partly to unsuitable 

 lenses and lack of a good guide to the Order,* the notes on Peri- 



*The present paper was only made possible through my coming into 

 possession of a copy of Dr. A. J. Schilling's "Dinoflagellatas" 1913 (in 

 Dr. A. Pascher's "Die Siisswasser-flora Deutschlands, Osterreichs und 

 der Schweiz") a most useful little brochure with excellent illustrations 

 of all the freshwater forms known from Central Europe, in most cases 

 after the original types. I have not yet succeeded in obtaining Dr. 

 Schutt's "Gymnodiniaceae" (Engler and Prantl-Die naturlichen pflan- 

 zenfamilien) . 



