BY R. ETHEKIDC^E, .TUNIf., AND JOHN MITCHELL. f.OS 



are chiefly JVinudeus and Asaphus. Mr. Macleay lias done me 

 the honour of calling one of the former after its finder, T. Clar'kei.'' 

 Again: — " 'J'he existence of Tiinuclei at Yarralumla, and especi- 

 ally of one species which I cannot separate from 2\ Carnctaci, is 

 an important fact which must not be lost sight of."'* 



We have never had the good fortune to see an example of this 

 interesting genus from the Silurian rocks of the Continent, but 

 the thought has on several occasions crossed our minds, whether 

 or no examples of Harpes were mistaken for it by Messrs Clarke 

 and Macleay. 



Genus Asaphus Krongniart, 1822. 

 (Hist. Nat. Crust. Foss., 1822, p. 17). 

 0/m\ — Bevond Clarke's casual remark quoted above, nothing 

 is known of the presence of this genus in the Silurian rocks of 

 Australia, but from the "Despatch Limestone" of Zeelian, Tas- 

 mania, a single small pygidium was obtained '' sufliciently well 

 preserved to show the presence of the genus in these locks, and 

 no more."t 



Genus Amphion Pander, 1831. 



('Beitrage Geog. Russisch. Reiches, 1831, p. 139). 



Obs — Under the name of A.(\) hrevispinus^ one of us described 



two small pygidia from the " Despatch Limestone" at Zeehan, 



Tasmania, believed to be allied to the l^Y\t\&\\ A. pseudoarticu- 



latus Portlock.i The genus is unknown in Australia. 



Genus I l l .e n u s Dal man, 1826. 

 (Kongl. Vet. Akad. Hand!. Stockhohn, 1826, p.248). 

 History. — The history of this genus is comprised within that 

 of two species, one purely Australian, the other both Australian 

 and Tasmanian. The former is a pygidium recorded by De 

 Koninck from " Boree Cavern, ' provisionally referred to /, ivnh- 

 lenbergi Barr.g The second species, I. johiistoiii, was established 



* Clarke, Quart. Journ. Geol. Soc, iv., 1848, pp.64, 66. 

 t Etheridge, Tasmania, Kept. Secy. Mines for 1895-6(1896), p. xiii., PI. 

 fig. 2. 



t Etheridge, Tasmania, Rept. Seey. Mines for 189.J-0. 

 g De Koninck, Foss. Pal. Nouv. Gailes du Sud, Pt. 1. 117«, p. 46. 



