72 A CATALOGUE OF AUSTEALIAN FOSSILS. 



(Pelecypoda.) (Mid. and Up. Palseozoic.) 



Genua Mytilus\ Linnceus, 1758 (Systema, cd. 10, i. p. lOi; Lamarck, Prodrome, 

 1799, p. 88; &c.) = Perna, Adausou, 1151.—2Iytilacea-MytiUdce. 



M. Bigsbyi, de Kon. 



M. crassiventer, de 

 Kon. 



U.Pal.(Carb.) 

 U. Pal. (Carl).) 



*Foss. Pal. NouT.-Galles du Slid, 

 1877, pt. 3, p. 288, t. 21, f. 1. 



*Foss. Pal. Nouv.-Galles du Sud, 

 1877, pt. 3, p. 288, t. 21, f. 2. 



Branxton, N. S. 



Wales. 

 Branxton, N. S. 



Wales. 



Genuf3 Notomya, M'Coy, 1847 (Annals Nat. Hist. xx. p. 303; Stoliczka, Pal. Indica, 



HI. p. 83) = Myonia et Mieonia, Dana, 1847 (non Myonia, Adams, I860); Cleohis, 



Daua, 1847; Py ramus, Dana, 1847. — Myacea-Saxicavida? 



N. axiuia, Dana. 



N. clavata, M'Coy. 



U.Pal.(Carb. 



U.Pal.(Carb. 



Cypricardia ? simwsa, Dana,* Am. 



Jonr. Science, 1847, iv. p. 157 ; 



M. axinea, *Geol. U. S. Explor. 



Exped. p. 696, Atlas, t. 5, f. 5; 



C. sinuosa et IJ. axinia, Clarke, 



S. Goldfields, 18G0, pp. 287, 



288. 

 *Annals Nat. Hist. 1847, xx. p. 304, 



t. 15, f. 4; *Proc. E. Soc. V. D. 



Land, 1851, i. p. 327, t. 15, 



f . 4 ; Plews, Mining Inst. Jour. 



1858, VI. pt. 3, t. 4; Clarke, 



S. Goldfields, 1860, p. 287. 



Illawara, 

 Wales. 



N. S. 



Wollongonj 

 Wales. 



N.S. 



Notomya or 3Iceonia may just as well belong to PacJiydormcx, and vice versa " [Pal. Tiidica, in. p. 83). 

 Mceonia (Myonin), Cleobis, and Pyramus were proposed as new genera by Prof. Dana in, 184.7, but 

 in the next year he susgestod that the various species contained in the three so-called genera should 

 be brought together under the one name j\[,eonia, "as the gradations are such that it is difficult 

 to draw lines of distinction" (Amer. Jour. Sc. 18t^, v. p. 4-.'54). Again he says, "the divisions may, 

 perhaps, form sub-gent-ra" {Geol. U. S. Explor. JCxped. p. C91). The section Pyramns or Pyramia is 

 stated to correspond with Notomya, M'Coy. ami is slightly antecedent to it in date. As, however, 

 I agree with Dr Stoliczka in con.sidering M'Coy's description "far more intelligible than that given by 

 Dana of his genus," and as in addition M'Coy no doubt correctly indicated the affinities of his genus, 

 I prefer to adopt the latter for the whole of the species which have been referred to these genera. 

 In dealing with this portion of my subject I have experienced the utmost difficulty, and can only 

 offer the present synonymy as a temporary solution, until some pala?ontologist is "afforded an op- 

 portunity of working the sul)j<-ct out in fletail. To his previous remarks on this subject Dr Stoliczka 

 adds, " neitiier in the text nor Atlas of his later work does Dana mention which of tlie species belong 

 to each of the three sub-genera ; and from the descriptions and figures the reader will find it very 

 difficult to arrive at anything like accuracy of determination." 



^ The name Mytilus should give place to that of Perna, Adanson, proposed in the Voy. au 

 Senegal (p. 217). Although Adnnson was not a binomial writer, Perna, like many other of his genera, 

 was perfectly well characterised, and ought to be adopted. 



