BY R. VON LENDENFELD, PH.D. 469 



91. DIDYMOGRAPSUS LOGANI. Hall. 



This species together with an aberrant variety named by McCoy. 

 D. L. Var. Australia is found in Castlemaine, Kangaroo Creek, 

 and in other places in Victoria. (1.) 



92. DIDYMOGRAPSUS EXTENSUS. Hall. 

 This species occurs in great abundance in the black Llandeilo 



flags (2.) 



93. DIDYMOGRAPSUS CADUCENS. Salter. 



This species occurs in Castlemaine and other places in Victoria (3). 



94. DIDYMOGPAPSUS GRACILIS. Hall. 



This species was obtained from the Bala flock, north-west of 

 Bulla (4.) 



95. DIDYMOGRAPSUS THUREANI. McCoy. 



This species was obtained from Llandeilo and Sandhurst (5.) 



96. DIDYMOGRAPSUS HEADI. McCoy. 



Rare in the Llandeilo flags, and in a few other places in (6) 

 Victoria. 



16. GENUS. CLADOGRAPSUS. McCoy, non. Geinitz ! 



Stem simple below with two rows of cells and mid-rib as in 

 Diplograpsus ; dividing above into branches with one row of cells 

 only ; cells excavated in the margin as in Climacograptus ; without 

 distinct tubes. 



97. CLADOGRAPSUS RAMOSUS. Hall. 



Not uncommon in the white Llandeilo flags, and in the black 

 flags north-west of Bulla (7.) 



(1.) McCoy. (I.e.), p. 18, pi. II. 



(2.) McCoy. (La,), Decade II., p. 29, pi. XX. 



(3.) McCoy. (La), p. 30, pi. XX. 



(4.) McCoy. (I.e.), p. 35, pi. XX. 



(5.) McCoy, (i.e.), Decade V., p. 39, pi. L. 



(6.) McCoy. (I.e.), p. 40. pi. L. 



(7.) McCoy. (I.e.), Decade II., p. 33, pi. XX. 



