814 PERIDINEAE OF NEW SOUTH WALES, 



• 



plates in dorsal view do not coincide in position with those of 

 the epi valve and also run back obliquely. The antapical plates 

 also are uneven in size and obliquely disposed, the central suture 

 running slantwise across from the centre of the longitudinal fur- 

 row to a point near the edge of the third equatorial plate. The 

 longitudinal furrow is greatly dilated behind and carried right 

 back to the margin of the hypovalve. 



These peculiarities are just as distinct in specimens from Bris- 

 bane, though the latter were considerably smaller. The "crass. 

 63 /a" noted above was from a Sydney specimen 74 -X 70 m,; those 

 from Brisbane measured 49 x 46-53, crass. 42 fx. 



( P.TABULATUM ) Var. OVATUM Playf . 



hoc. cit., p. 544, PI. lv., f . 14. This is a very rare form and 

 I have not been able to secure further specimens. It is very 

 transparent and I think the central line at the apex of the epi- 

 valve belongs to the ventral side. With long. 50, lat. 44 ^ it 

 probably falls under P. granulosum. It has of course nothing 

 to do with P. tabulatum but might conceivably be connected with 

 P. caudatum mihi. 



Peridinium australe mihi . 



Peridinium magnum, globosum vel subglobosum, plerumque 

 rotundatum sed interdum angulatum; fossa transversa sub- 

 mediana paullo spirali divisum. Membrana rugulosa, rugis per 

 longitudinem dispositis. Epivalva hernisphaerica interdum fovea 

 apicali atque spinis minutis binis instructa, praecipue ad apicem 

 versus compressa; tabulis sequatoriis 7; subapiealibus 3 (dorsali 

 una latissima, ventralibus 2) et inter cas, paene exacte apicalibus, 

 tabulis 3 angustis (mediana minima, rectangulari) in serie trans- 

 versa dispositis; tabula rhomboidea ad apicem extensa. Hypo- 

 valva hernisphaerica; fossa longitudinali usque ad marginem pos- 

 teriorem extensa, pone modo dilatata; tabulis antapicalibus 2, 

 inaequalibus, coalitis; margine rotundata; sutura obscura. 



Long. 44-54, lat. 42-59, crass. 31-40 ^ Sydney (PI. xlii., x 

 f. 8) . 



Long. 47-53, lat. 38-48^. Brisbane (PL xli., f. 4) . 



Sydney Water Supply (66, 100); Centennial Park (133); 

 Botany (145); Guildford (146); Brisbane. 



Syn. Peridinium tabulatum var. Westii f . australis Playf., I.e., 

 p. 542, PI. lv., f. 5-9. Formerly I considered that on account 



