480 CARBOKiFEKOUS TRlLOBlTES OF AUSTRALIA, 



to enable one to say positively whether its features place it with 

 the Phillipsia or the Griffithides type; but, except for the un- 

 certainty of the presence on its glabella of the normal lateral 

 furrows of the Phillipsian genus, it does not differ from the 

 head-shields above referred to, which are considered to belong to 

 P. looodwardi Eth. fil. Further, it will be found that G. sweeti, 

 as far as present evidence admits, cannot be separated from 

 Grlffitliides semi)iifenis var. australasica Eth.fi]. This, I think, 

 will be con(;eded after the description and figures of the latter 

 have been studied in conjunction with my remarks on the latter, 

 under P. iroodivardi: and an examination of Plate li., fig. 14^ 

 which is a photo of Mr. Etheridge's type specimen, which shows 

 two tails, the greater portion of a thorax and tail conjoined, an 

 intafylio of a portion of a head, and, between the two tails and 

 on the left top corner, is a view in relief of this intaglio. 



We are up against a problem here, wliich can be solved only 

 Ijy the discovery of better material: and when it is solved, it 

 seems to me that a new genus or subgenus will be needed for 

 the reception of tliis trilobite with the ten thoracic somites. 



The following is a fuller description of the species than is 

 given bv Mr. Etheridge It will be seen fronj the photograplis 

 of this species now given, that it was not as correctly figured as 

 it might have been. 



Complete form suboval. 



^}i. Chars. — Cephalon incomplete, apparently granulated 

 throughout, with grHiiules of uniform size. Glabella incomplete, 

 moderately tumid, mesial and anterior furroAvsnot visible (though 

 there appears to be a faint trace of the mesial pair): basnl 

 furrows deep, joining the neck furrow: basal lobes fairly large, 

 suboval: supplementary lobes of moderate size, and suboval : 

 neck-furrow wide and fairly deep: neck-ring stronger than any 

 of the axial rings of the thorax. Fixed and free (;heeks absent. 



Thorax consisting of ten segments, finely and evenly gran- 

 ulated: axis prominent, diminishing posteriorly very little in 

 prominence, and barely at all in spread: each ring, except the 

 last, has centrally a slightly forward direction, the last ring is 

 stron<ier than the others, non-tuberculate; axial furrows shallow. 



