322 Frederick Chapman: 



from base of shell, 3 niiii. ; about 10 rings to 10 nun. counting from 

 the basis of the shell; 22 rings in total length of shell. 



Another, larger, example from the same locality, somewhat badly 

 crushed, has a length of 55 nmi. The annulations are about 3 mm. 

 apart in the wider part of the shell. It is probably a senile example 

 of the same species. 



Observations. — This species of Cornuli'es is apparently tlie oldest 

 recorded. The well-known C . serpularius, Schlotheim,! is a much 

 larger foini than ours, and has the distance between tlie annuli 

 longer. C. fle.ruosvs, J. Hall ,2 is closely related to C. strpularius^ 

 but having a flexuose opex. G. scalar? form is, G. R. Vine, 3 from the 

 Lower and Upper Wenlock Shales, differs from the Australian 

 species also in having more widely spaced annuli, but the character 

 of the rigid portion of the annulation is in keeping witli ours in 

 having a blunted crest, but without a central keel. 



The Tasmanian species, (\ tasmanica, \\. Etheridge. junr.,* 

 differs in its more quickly tapering ^hell and decided flexuous 

 habit. The specimens occur as casts in a l)lue-grey or whitish 

 mudstone from Heazlewood and Zeehan. 



A(je of the. Victorian ■sprci7ne7is.— The two examples of C. yaungl 

 ^vere found in a dark blue slate associated with the remains of the 

 following graptolites : — 



])idymo(frapfus caduceiis, Salter; 7^etraf/7'aptus serra, Brongn. 

 sp. ; T . quadrihrachiat us , J. Hall sp. ; and Oncograptus sp. 



This assemblage of graptolites points to the low^est part of the 

 Darriwillian stage (4th in the series), of the Lower Ordoviciaii. 



Occurrence. — In dark blue slate with cleavage at a low angle to 

 hedding plane. Moorabool River, near Mei'edith, N.W. of Gee- 

 long. Two examples; presented by Mr. James Hay Young, after 

 Avhom the species is named, in recognition of his valuable assist- 

 ance in collecting ne^v and rare fossil specimens. 



A'ote on Pferoconus mirns, Hinde.^ 



The shell of this generic type recalls Cornulites, the chief differ- 

 ence being the '' shelly flap or fin-like extensions disposed at 

 regular intervals from the basal point to the summit aperture.'^ 

 There is also a central rod-like structure often present, which, as 



1 Sehlotheiin. Petrefacteiikuiide, 1820, pi. xxix., fig. 7. Mnrchisoirs Silurian S\ stem, pt. ii., 

 1839, p. 027, pi. XX vi., fi<,'s. .'>-8. 



2 Pal. New York, vol. ii., 1851, p. 08, pi. xxviii., figs. 12«-«. 



3 Quart Journ. Geol. Soc, vol. xxxviii., 1882, p. ^79, pi. xv., figs. 1, 9, 10. 



4 l)e.scriptioii of Tasmanian Silurian Fossils presented to the .Vustraliap Museum, ilobart. 

 1896. p. 37, pi. — , figs. 10, 11. .- 



5 Geol. .Mag., 1900, p. 149, pi. vii., figs'. 1-4. See ulso Whidhorne and IJlake, ibid., pi>. 2.39, 240. 



