264 The Ottawa Naturalist. [March 



Mary's, Ontario, under the name Panenka gra?idis, in the fourth 

 volume ot the " Canadian Record of Science." 



The generic name Panenka, as stated by Barrande, is a Czech 

 or Bohemian word, with the same sig-nificance as puella in Latin. 

 But, althoug-h the seventeen species of Paneiika enumerated 

 by Hall are included by S. A. Miller in the list of " North 

 American Palaeozoic Fossils" in the first edition of his "North 

 American Geology and Palaeontology," published in 1889, yet in 

 the First Appendix to thnt list, published in 1892, he says that the 

 name Pa7ienka is " not formed according to the rules of nomen- 

 clature and should be discarded." It had, however, as already 

 explained, come into use by palaeontologists on both sides of the 

 Atlantic, so that its rejection would probably be attended with 

 more inconvenience than its retention. 



Quite recently, in November and December, 1901, the Rev. 

 Thomas Nattress, of Amherstburg, Ontario, kindly sent to the 

 writer, for identification, a few specimens of a fossil lamelli- 

 branchiate bivalve from the immediate vicinity of Amherstburg. 

 These, he writes, were collected by Mr. Harry Hodgman from pieces 

 of solid rock blasted and dredged out of the bed of the Detroit 

 River, at the Old Lime Kiln Crossing, Anderdon township, Essex 

 county, a " few hundred yards only within the Canadian boundary, 

 in thecourse of deepening the channel." They clearly belong to the 

 genus Panenka and are obviously quite distinct from P. grandis. 

 So far as the writer can see, they cannot be satisfactorily identified 

 with any of the known species of Panenka from the American 

 Devonian, Two of them as much more perfect than the rest, and 

 both of these are represented on Plate XV. The original of 

 figure I on that Plate represents a specimen with a subcircular 

 marginal outline, which is somewhat similar in form to P. miilti- 

 radiata, Hall, but which has broader and more oblique umbones, 

 and a much longer hinge line posteriorly. Figure 2 represents a 

 specimen with an elongate subovate marginal outline, which comes 

 nearer to P. robusta and P. dichotonia of Hall, but which is more 

 regularly and longitudinally subovate than either. In P. robusia, 

 also, the ribs are much fewer and coarser, and in P. dichotoma the 

 anterior end is represented as produced and subangular above. 

 Under these circumstances it seems desirable to distinguish the 



