226 RECORDS OF THE AUSTRALIAN MFSETIM. 



former ai-e certainly not. Indeed Suiiyuinolites of 1844^' 

 appears to have included a heterogenous assortment of forms, 

 and is in some respects a synonym of Edmondia, De Koninck, 

 1842. 



From 1844 to the present time, there has been a constant 

 juggling with the name AJlorlsma, or Allerisma, as some spell 

 it, and it is time it made way for a new name properly defined. 

 One of the latest American writers, Mr. G. H. Girt}^ uses^^ the 

 genus as of 1844, and even the careful and astute Waagen 

 employed^^ the name in an ill-defined sense, doubtful whether 

 his species conformed to one or the other definition, although 

 he does not say so in so many woi'ds. Even Mr. J. G. Good- 

 chihl's amended description^^' does not in everj' way suffice. 

 This appears to be based on King's definition of 1850, and 

 might have been used had Mi'. Goodchild proposed a nomen 

 nudum and named a type species. 



[Allorisma] passaloides,-^ sp. nov. 

 (Plate xl., fig. 8). 



Sp. Chars. — Shell (cast) transversely oblong, revy inequilat- 

 eral; valves sub-compressed; cardinal margins long posteriori^', 

 slightly ai'ched ; ventral margins straight medianally ; anterior 

 ends small but pi'ojecting, their margins sharply rounded, in 

 all probability a shallow lunnle present ; posterior extended, 

 end inclined to be nasute ; diagonal I'idge rounded and incon- 

 spicuous; posterioi" slope flattened. Exterior with concentric 

 costfe, which were particular!}' strong on the anterior end and 

 anterior-vential portions of the valves. 



Ohs. — The ligament must have been wholly external, as 

 there is no trace of any meclianisni along the cardinal margins 

 for its attachment. One other desoibed shell, Sanguhiolites 

 feuesovi, De Koninck, is possibly congeneric with [AUorism(('\ 

 passaloides ; in the former the anterior end is much larger ajid 

 the cardinal margin quite straight. 



1^ McCoy — Synop. Carb. Lime Foss. Ireland, 1844, p. 47. 



'** Qirty — Carboniferous Formation and Faunas of Colorado (U.S. 

 Geol. SiD-vey Prof. Papei:<i, No. 16, Serie.'i C, 1903), p. 437. 



i« Waagen— Salt Eange Foss. (Pal. Ind.), i., pt. ill., 1881, p. 192. 

 2" Goodchild— Proc. R. Phys. Soc. Edinb., xi., pt. 2, 1893, p. 245. 

 21 TTUcrcraAos-— a peg. 



