174 



with greatest breadth towards middle of from 4 to 5 inches. 

 There are 27 pairs of alternating pinna? disposed on either side 

 of the principal rachis or stipes diminishing gradually to either 

 extremity, where they are reduced to variously lobed pin- 

 nulse. The whole shape of frond is therefore broadly 

 lanceolate or ovato-lanceolate-acuminate. At the base of the 

 lower middle pinnae the pinnules answer to Morris's 8. 

 lobifolia. The basal pinnules of immediately succeeding 

 pinna? answer to M'Coy's S. hastata and S. flexuosa ; 

 towards apex where the pinna? are themselves reduced to 

 pinnula? examples could be found corresponding to M'Coy's 

 8. germanus and 8. plwnosa ; while in the greater number 

 of intermediate pinna? the following description for 8. 

 crebra (T. Woods) would equally serve for the pinnules of our 

 abundant Tasmanian form, viz., "pinnules so close together 

 as not to be easily distinguished, faintly pinnatifid ; lobes 

 a little more oblique than the pinna?, oblong-ovate, with a 

 slight undulating margin ; costa sending off veins which fork 

 once, and the venules reaching the margin." This being so,, 

 I shall be inclined to regard the various species named as so 

 many varied parts of our variable form, that is, so long as it 

 remains uncertain that the features which characterise the 

 fragments hitherto erected into separate species are per- 

 sistent throughout the whole frond of perfect specimens. 



Cyclopteris Australis. Nou. sp. 



Frond large, graceful, broadly rounded and flabelliform,, 

 divided towards extremities into seven or eight digitate seg- 

 ments. Segments somewhat cuneate, with irregularly trun- 

 cate and crenulate margins. The nerves spring from a 

 common centre at base of fiabellate frond, where they com- 

 pose about five primary groups, each one breaking up 

 dichotomously into four branching venules, these again 

 forking once or twice before reaching the extreme margin of 

 the incised lobes. The nerves are fine and rather widely 

 spreading, although firm and well marked, as in the existing 

 Trichomanes reniforme, Forst. 



Greatest breadth of frond, about 90 millimetres ; greatest 

 length, about 75 millimetres ; breadth of segments, from 10 

 to 15 millimetres. Dark grey shales, Augusta-road, New 

 Town. 



ZAMIEJ1. 

 Genus, Pterophyllum. 



Fronds probably caducous, pinnate ; segments elongate, 

 linear, firmly inserted at an angle by their whole base upon 

 the rachis, but separate from each other, but truncate to the 

 apex. Nervules simple, equal, parallel, reaching to the apex 

 of the truncate pinnules. 



