Victorian Fossils, Fart XIV. 295 



has also found this form at the same place, informs me that this 

 shale was obtained about 20 or 30 feet down in a shaft near 

 the Moonee Ponds Race Course, and below the bed of th© creek. 



Am pyx yarraensis, sp. nov, (PI. LXI., Fig. 3). 



Description. — Ceplialoii only. Subtriangular, with a prominent 

 lengthened, ovate glabella, strongly convex, pointed at both 

 €nds, with a deep, elongate depression on each side near the base. 

 Anterior extremity of glabella terminating in a long, flexible spine, 

 nearly equal to the length of the glabella, and evidently originally 

 much longer. A deep sulcus separates the cheeks from the 

 glabella. Fixed cheeks triangular, with a convex anterior border 

 and well-marked basal furrow. Neck ring of aiabella narrow. 



Dimensions. — Width of cephalon, 7.5 mm.; length of glabella, 

 4.75 mm.; length of spine, 4.25 mm.; width of glabella, 2.75 mm. 



Affinities. — The nearest form to the present species appears to 

 be " Rapliiophorus " culminatus, Angelina ; but its cephalon 

 is narrower. Angelin's species occurred in the ordovician (trinu- 

 cleus schists and limestones) of Mount Kinnekulle, Sweden. 



Occurrence. — In yellow mudstone of silurian (nielbournian) 

 age. South Yarra (Yarra Improvements). Coll. by Mr. F. P. Spry. 



Fam. AsAPHiDAE. 

 Genus lliaenus, Dalman. 

 lUo.enus jutsoni, sp. nov. (PL LXI., Figs. 4, 5). 



Description. — A small species for this genus. Form, long, 

 oval. Head semi-oval ; highest along the median line, roundly 

 .sloping to the lateral and frontal margins. Axal furrows well 

 impressed at the j^osterior margin, ceasing a little beyond the 

 top of the eyes. The eyes narrow, (?) sub-elliptical or lunate. 

 A narrow and rounded median fold or ridge extends along the 

 summit of the glabella, tapering off into a mere thread before 

 reaching the anterior margin. Facial suture nearly the same as 

 in L. (larisii, but straight rather than concave when nearing 

 the posterior margin. Anterior border somewhat narrow and 



1 Pal. Scand., 1S54, \). 82, pi. xl., tij--. 8. 



