Lower Silurian.'] PALAEONTOLOGY OF VICTORIA. [Graptolites. 



Fucoides serra might be said to approximately agree. I have 

 little doubt that the Grapfolites latus (McCoy) which I descrilied 

 in 1852, from the Lower Silurian or Cambrian slates of Builth 

 and the Skiddaw slates of Scawgill, is one of the stems, imperfect 

 at each end, of the same species as was subsequently described by 

 Prof. Hall from nearly perifect specunens from the similar slates of 

 Quebec under the name G. bryonoides. The great size of the 

 stems, both in length and width, and the comparatively small, 

 nearly equilateral denticles, render the species easy of recognition. 

 Common in the black flags of B* 1, branch of Barwon Creek, 4 

 miles N. of Griffith and Green's station ; and B"* 2 ; B" 39, B*- 44 ; 

 B" 45 ; Watchbox Range, Glenhope, and Piper's Creek, B" 43 ; 

 B" 27 ; B" 46, section 29, Spring Plains ; B* 80, Kangaroo Creek, 

 S. of township ; in chiastolite slate of S* 5 ; black slate of W.L.S. 5 ; 

 W.L.S. 1, section 16, parish of Darriwill, Sutherland's Creek ; 

 W.L. S. 2, section 84, parish of Coole Barghurk ; black glossy 

 slates of creek W. side of Lerderberg, 2| miles N.W. of Lancefield 

 camp. 



Explanation op Figures. 

 Plate II. — Fig. 2, base of young specimen, natural size, showing the origin of the four short 

 abruptly recurved branches from the short funicle. Fig. 2a, portion of specimen fig. 2 magnified, 

 showing the form of the denticles and shape of cells. Fig. 3, another specimen with longer 

 branches, natural size. Fig. 5, specimen mth the usual width of the adult branches broken short 

 at the ends. Fig. 5a, portion of ditto magnified. 



Plate II., Fig. 4. 



GRAPTOLITES (DIDYMOGRAPSUS) OCTOBRACHIATUS 



(Hall sp.). 



Description. — Central stipe or vinculum straight, about H lines long-, 

 bifurcating- equally at each end at an angle of 80°, with two blanches, each about § 

 of a line long, and these bifurcating each into 2 equal simple brandies (8 in all;, 

 several inches in length ; the stipe and branches as far as a little bej-ond the last 

 furcation are about ^ of a line wide, seem formed of a definite capillary tube, which 

 extends along the plain edge of the branches ; the branches at about 1 inch fi-om the 

 base are commonlj' j of a line wide, but in some specimens from B'' 43 they 

 are 1^ lines wide, the denticles (5 to nearly G in 3 lines), very coarse, triangular, 



[ 17 ] c 



