Miscellanea. 317 



seen to attain. The PhilUpsia Maccoyi of Capt. Portlock's Geol. 

 Report on Londonderry, &c. certainly belongs to this genus, and is 

 at first sight difficult to distinguish specifically from the Australian 

 species. The Irish species alluded to was collected by the writer 

 from the lower carboniferous limestone of Kildare, and sent to 

 Captain Portlock for his monograph of Irish Trilobites, under the 

 impression that it formed the type of a new genus and species ; but 

 probably from there being but one specimen it Avas placed provi- 

 sionally by that author inlris genus PhilUpsia, from which it dilFers 

 in its small, short glabella, smooth eyes, want of cephalothoracic 

 furrows, &c. Having now examined numerous specimens of the 

 Australian species, tliere can be no longer any doubt of the dis- 

 tinctness of the group from PhilUpsia, from the characters of the 

 cephalothorax, and the pygidium is still more distinct. From those 

 materials I have therefore drawn up the above characters, which it 

 is believed will distinguish them easily from the other generic types. 

 From the general similp.rity in the structure of the pygidium, I am 

 inclined to refer the fossil which I have named PhilUpsia (?) discors 

 (Synopsis of the Carb. Limestone Foss. of Ireland, pi. 4. fig. 7- 

 p. 161) to the same genus. This is also a very small Trilobite, the 

 length of the pygidium being only three lines ; and although refer- 

 ring it provisionally to PhilUpsia, I suggested in the above work 

 that it should, when better known, form the type of a distinct genus, 

 which, however, it was not possible to frame until now. I have 

 dedicated the present species to Count Strzelecki, whose fine work 

 on the physical features of New South Wales and Van Dieraen's 

 Land has so materially advanced our knowledge of that country, 

 and who has recorded the existence of minute Trilobites (undeter- 

 mined) in the limestone of Yass Plains, which probably belong to 

 this group, if not to this species. 



Brachymelopus Strzeleckii (M'Coy). PI. XII. fig. 1- 

 Sp. Char. Glabella widest at the base, with one very minute 

 obscurely marked cephalothoracic furrow at the base on each 

 side; all the segments of the pygidium with an irregularly 

 tuberculated ridge along -the middle ; lateral segments forming 

 large tubercles where they join the thickened limb, opposite each 

 of which is a short slender spine projecting from the margin. 

 The greater size of the glabella and its being widest at the 

 base will distinguish the head from that of the P. Maccoiji (Portk.), 

 and the granulation extending entirely across the segments and 

 the spinose margin will distinguish the pygidium from that of the 

 P. discors (M'Coy), 

 Width one and a half line. 

 Common in the shale of Dunvegan, N. S. Wales. 



PhilUpsia. 

 ' A species closely resembling the P. gemmulifera (Phil sp.), but 

 not distinctly preserved, occurs in the shale of Dunvegan, N. S. 

 Wales. 



