Llffle-kmnvn Victorian Fossils. Ii7 



for Caryocaris.' The outline of our specimen is essentially 

 different from both Lingulocaris aiidCaryocaris; and the peculiarly 

 formed rostral processes seen in our specimen seem to be quite 

 lunknown in the above-mentioned genera, to which this form 

 might otherwise be somewhat related. The masticatory apparatus 

 has not been recorded from any of its immediate allies, the nearest 

 laeing the well-known dental ridges of Dithyrocaris, which, how- 

 •ever, differ in having the longest cusps at the anterior end instead 

 of the median, as in Rhinopterocaris. 



Localities and Horizon. — Rhinopterocaris maccoyi occurs at 

 several of the lowermost horizons in the Lower Ordovician of 

 Victoria, which are characterized by different assemblages of 

 Graptolites. The specimens obtained by the Geological Survey 

 •of Victoria, and now in the National Museum, are as follows: — 

 Camp north of Lancefield, Bb 27 [174-7] associated with Tetra- 

 graptus f ruticosus, T. serra and Phyllograptus typus, in a pale grey 

 slate. Bb 31 [172-3] in chiastolite slate. Bb 39 [167-71] 

 associated with Tetragraptus serra, in dark grey slate. Bb 40 

 [182-5] in phyllite. Bb 41 [188] in pinkish decomposed shale 

 (caudal appendages). Bb 44, [186-7] in black shale. West 

 ■of Gisborne, Ba 70 [244] in greenish-grey slate. (?) Barker's 

 ^Street, Castlemaine, Ba 78 [245] associated with Didymograptus 

 •caduceus, Tetragraptus decipens, and Loganograptus logani, in 

 greenish-yellow slate. E. of Guildford, Ba 83 [189] in decom- 

 posed shale. Near Guildford, Ba 91 [190-1] associated with 

 Didymograptus sp. and Trigonograptus wilkinsoni, in decomposed 

 shale. From Parish of Coole Barghurk, W.L.S.2 and W.L.8.3 

 [180-1] in black slate. 



Also from Burn's Reef, Chewton, Bendigo, Castlemaine 

 <T. S. Hall collection). 



From Castlemaine, an exceptionally large cai'apace measuring 

 50 mm. in length, and 20 mm. in greatest height (G. B. 

 Pritchard collection). 



Mr. Etheridge's specimens came from Bendigo, and from 

 Baynton's, Campaspe River, Central Victoria. 



My best thanks are due to Mr. T. S. Hall, M.A., and Mr. 

 G. B. Pritchard, for their kind loan of specimens which enabled 

 me to work out the details of this and the foregoing species. 



1 Quart. Journ. Geol. Soc, vol. xix., 1863, p. 137 (fig. 15) and p. 139. 



