T. S. EaJl—GraptoIite Rocks, Vicforia, Australia. 449 



Dichograptiis octonarius. J. Hall. (PI. XXII, Fig. 7.) 

 The tertiary brandies at a little more than 1 cm. from the sicnla 

 are from 2 5 to 3 ram. broad. Thecge eleven in 1cm., slightly 

 expanding, curved, inclined at about 3U° in the middle parr of 

 their length, and at nearly twice that angle near their aperture, 

 Apertural margin strongly concave, forming an angle of about 150°, 

 and making with the outer margin a prominent denticle. The 

 species seems somewhat more lax in habit than D. octobrachiatns, 

 and specimens are common in the middle beds of the Castlemaine 

 district, which lie in very similar positions to that figured by Hall 

 in his " Graptolites of the Quebec Group." 



Locality. — The figured specimen is from Victoria Gully, Castle- 

 maine. 



Clonograptiis rigidus, J. Hall, var. tenellus, Lns. (PI. XXII, Fig. 8.) 

 The figured specimen shows a common form in the Lancefield 

 beds, where it is associated with the typical form, as described by 

 Hall. C. rigidus and C. tenellus cannot, I think, be separated, 

 and the extremes are connected by a long intermediate series at 

 Lancefield. 



Goniograptus macer, n.sp. (Illustration, p. 450, Figs. 9, 10.) 

 Syn. Zoganograpfns Logani'> R. Etheridge, jun. (non J. Hall) : 

 Ann. Mag. Nat. Hist., 1874, p. 4, pL iii, fig. 12. 

 Id., McCoy {non J. Hall) : Prod. Pal, Victoria, Dec. i, p. 19 

 (loc, B b, 29, specimens in the National Museum, 

 Melbourne), 

 Goniograptns, sp., T. S. Hall : Proc. Eoy. Soc. Victoria, n.s., 

 vol. vii, 1894 (1895), p. 72, 

 Hydrosome slender. Primary branches about 1 mm. in length, 

 and forming an angle of 180° with each other. Secondary branches 

 diverging at about 90° from each other, and then bending in a 

 zigzag manner at intervals of about 1 5 mm., and giving off tertiary 

 branches from the salient angle. Tertiary branches form two to 

 four in number. After giving off the final tertiary branches the 

 secondary branches as well as the tertiaries may reach the length 

 of 30 or 40 mm,, and are fairly rigid. Sicula about 1 mm. in length, 

 slendei", and very slowly tapering. Thecse eight or nine in 10 mm., 

 overlapping by half their length. Apertural margin slightly concave, 

 forming an angle of about 110° with the axis of the branch. Outer 

 margin inclined at about 25° to the axis of the branch, gently 

 curving towards the distal extremity. 



Though the species is fairly common, the delicate nature of the 

 hydrosome rarely allows of its being found in a well-preserved 

 condition, and the thecae are usually invisible in specimens in slate. 



Under the name of Goniogt-aptus, sp., I have previously dealt 

 with this species, and shown that it has been confounded with 

 Lognnograptus, which occurs only in higher beds, the two forms 

 never being associated. The species is evidently congeneric with 

 Dichograptus Kjerulji, Herrmann.' 



I See Geol. Mag., 18S6, pp. 13 et seq. 



DECADE IT. TOL. VI.— NO. X. 29 



