there appear to be only four strong tubercles along* it. 

 The coalesced pleurae are very niucli less in number. 



Another Australian 1'rilobite of this group has been 

 described^ by Mr. A. F. Foerste as Encrinurus Mitchelli, 

 but whether I am correct or not in my determination of 

 the Tasmanian forms, I think Foerste's species is identical 

 with them. 



Loc. — Heazlewood, in a blue-grey schistose rock ; 

 ? Zeehan, in the same matrix. 



Genus Amphion, Pander. 



(Beitiiige Geog. Russich. Reiches, 1830, p. 139.) 



Amphion? brevispinus, sp. nov. 



PL, Fig. 9. 



Ohs. — Tw^o small pygidiums, disassociated from other 

 parts, are referred to under this name. In the number of 

 the coalesced segments, backward direction of the pleurae, 

 embracing as they do the termination of the axis, and 

 spinose free ends, these fossils seem to agree with the 

 pygidium characters of the genus Amphion. 



There are five axial segments, and a terminal appendage, 

 and five pleurae, the whole of the component parts being 

 rather widely separated from one another by deep grooves, 

 whilst the outward terminations of the axial segments are 

 slightly nodular. The pleurae are a good deal arched 

 downward, and the two last on each side quite posteriorly 

 directed. The terminal appendages are large relatively to 

 the size of the pygidiums, but this is not uncommon in 

 the genus. The free ends of the pleurae do not project far 

 beyond the margins, and are more perceptible in a portion 

 of one of the specimens, as a bluntly-toothed edge. 



The brevity of the pleural spines causes a resemblance 

 to the pygidium o^ Amphion Fischeri, Eichwald, as figured 

 by HofFraann,2 but not only is the terminal appendage in 

 A.? brevispinus longer, and generally larger, but the whole 

 pygidium of the latter is shorter and wider than that of the 

 E-uropean tail. 



A.? brevispinus is probably nearest to A. pseudoarticu- 

 latus, Portlock,'' resembling this British species both in 

 the number of its segments and shortness of its spines. 



JLoc. — Zeehan, in the Despatch Limestone. 



' Bull. Sci. Lat. Denison Univ., 1888, III., t. 13, f. 2, 3, 20. 

 ' Verhandl. Russ-K. Min. Gesellsch. St. Petersb., Jahr. 1857-68 [1858], 

 p. 34, t. 3,f. 4. 

 ' Report Geol. Londonderry, &c,, 1843, t. 3, f. 5 c. 



