Dr. H. Woodward — New Trilobites from S. Australia. 343 



the fossils are of Lower Silurian age. The dense, light-coloured 

 marble seems to contain no fossils." The same author mentions in 

 a note on ''Silurian Fossils from the Parara Limestone near Ardrossan," 

 see Trans, and Proc. and Eeport Royal Society of South Australia, 

 1882, vol. iv. (for 1880-81) p. 145 :— (1) "Species of Strophomena, 

 in shape like S. spiriferoides, McCoy, but an inch in breadth, with 

 concentric undulating ridges, and without radial striae. (2) Head of 

 a Trilobite, apparently of the same species as previously found, but of 

 a very much larger size, and showing details not observed in the other 

 examples. The glabella is \^" long, and ^" wide, with three pairs 

 of oblique furrows ; its surface is ornamented with numerous closely- 

 set granules." 



DoLicHOMETOPTJS, Augelin. Plate XI. Pig. 3. 



In the Palffiontologia Scandinavica, by IN". P. Angelin, Lipsiae, 1854, 

 p. 72, the author describes a new genus of Trilobites under the name 

 of Dolichometopus, of which only the head appears to have been 

 known. 



" Head bordered on either side by an intramarginal furrow, outer 

 margin angular, eyes large, with a semiorbicular orbital lobe ; facial 

 suture bent inwards behind the basal margin of the eyes, short and 

 bent outwards in front ; continuous near the front margin. Pront 

 distinct, subclavate, entire; glabella a little dilated." One species, 

 I). Sitevicus, tab. xxxvii. fig. 9, 95. Angelin's specimen was obtained 

 from Andrarum in Sweden, in his "regie B., Co?^ocory^Aflnw^," = Lower 

 Lingula Plags, Menevian (Hicks). 



In Angelin's specimen, as well as in our own, the cheeks are 

 "wanting, or imperfect. 



The glabella is nearly smooth, with only a slight indication of 

 furrows, tumid, twice as long as it is broad, the neck-lobe wide, fixed 

 cheeks shorter than the glabella, semicircular externally, and divided 

 by a straight fuiTow from the glabella and neck-lobe ; eyes smooth, 

 elevated, long, semicircular, rounded ; cheeks encircling the glabella 

 in front, the outer border of head-shield encircled by a deep f uitow, 

 which is interrupted in front of the glabella where the raised margin 

 is a little broader and slightly produced, as in Anomocare (Angelin). 



The head, when perfect, was probably 6 mm. broad and 5 mm. long. 

 The Swedish specimen is much larger, and the anterior border of the 

 head shield is much narrower, the glabella being consequently more 

 prominent in front. The eyes in the Australian specimen are larger 

 in proportion. 



I propose to name this little head DoUchometopus Tatei (Plate XL 

 Pig. 3). 



CoNOCEPHALiTES, Zenker, 1833. Barrande, 1852. Plate XL Figs. 2«, 1h. 



This genus is framed to contain a number of Trilobites, possessing 

 a semicircular head-shield, with a very distinct neck-segment ; the 

 glabella more or less conical, and divided by two or three short 

 furrows ; the axial grooves are deep and broad ; eyes placed near the 

 anterior part of the head-shield, near the angles of the glabella, or 

 near the centre of the side-lobes of the head. The facial suture 

 commences on the exterior margin of the head, turns inwards in 



