NOTE ON SOME TRILOBITES NEW TO AUSTRALIA. 

 By F. Ratte, Ing. des Arts et Manuf., Paris. 



LiCHAS PALMATA Variety sinuata, emend, from L. sinuata. 



Lichas sinuata, Ratte, Proc. Linn. Soc. N. S. W., 1886, Vol. I, 

 (2 ser.), p. 1065. 



(Plate I, fig. 6.) 



A t the meeting of November last, I announced the discovery of 

 silicified pygidia of Lichas in the Upper Silurian Limestone of 

 Wellington. During the printing of the paper it was suggested to me 

 to name some of the fossils I had figured, as it was thought better 

 to do so even at the risk of creating a synonym, than to leave 

 them unnamed. I, therefore, decided to do so, ^;roz;mowa%, at 

 least, for some of the fossils sufficiently represented, and in a 

 footnote, (page 1065) I proposed the name of Lichas sinuata, in 

 consequence of deep sinuses situated at the posterior angles of the 

 four lateral ribs of the pygidiuro. I also remarked that our 

 specimens strongly resemble Lichas hirsutus, Fletchei', and Lichas 

 palmata, Barrande, both belonging to Upper Silurian Rocks. I 

 indeed do not find much difierence between these two species, at 

 least from the descriptions given (1). In both, the margin of 

 the pygidium is raised sufficiently to form a prominent pad which 

 joins with the two extreme spines and with the four lateral ones 

 which are produced beyond of the margin. This character, how- 

 ever, is very slightly, if at all, indicated in our fossil. If any 

 of the figures at hand, in the absence of any other works, 



(1) In fact Barrande says, p. 602 : — "La forme figur^e par notre ami, M. 

 '* Fletcher, de Dudley, sous le nom de Lichas hirsutus, nous parait 

 "identique avec celle que nons d^crivons." 



