Existence of Cambrian Fauna in Victoria. 59 



In connection with the last-named genus, a very interesting 

 group of Trilobites described by the late Mr. Billings as 

 Bathyurics*' must be referred to. Unfortunately, many of the 

 species placed by Billings in Bathyurus seem to belong to other 

 genera ; certainly the earlier described speciest differ a good deal 

 from the later, although Vogdes, in his admirable " Bibliography 

 of the Palaeozoic Crustacea" (2nd edition), | retains most of them 

 under the old name. Walcott, however, remarks^ : " Soleno- 

 pleura appears to be of the same character as many of the species 

 placed under the genus Bathyurus by Mr. Billings, and I think 

 can be used for such forms as BatJiyuriis gregariiis, Billings, and 

 nearly all the species referred to the genus Bathyurus fi'om the 

 Cambrian." 



Many of Billings' Bafhyuri, more especially the later-described 

 ones, such as B. capax, B. dubius, B. Saffordi, B. Cordai, and 

 B. quadratus.W possesses the same s'quare-oblong glabella as 

 Dinssiis, but comparatively small fixed cheeks, and quite 

 different facial sutures, the latter being straight and almost 

 parallel to the axial grooves. The same objection also applies to 

 those that I have previously mentioned in the case of other 

 Trilobites, viz. — the entire absence of the circumscribed lobes. 

 There is one species, however, B. bitiiberculatus, Billings,1I that 

 possesses these lobes at the base of the glabella, and on this 

 account has been separated by Capt. Vogdes as a distinct genus, 

 under the name of L/oydiaM Indeed, perhaps, the before-men- 

 tioned Trilobite, Solenopleura ? tiiniida^ in which the basal lobes 

 are also developed, will fall into Lloydia as well, although it 

 must be mentioned that in S. 1 tumida there are ocular ridges, 

 whilst in Billings' species these are not represented. In the 

 absence of these ocular ridges and the anterior circumscribed 

 lobes, and its perfectly concave facial sutures, Lloydia differs 

 essentially from Dinesits. 



* Pal. Foss. Canada, Pt. 5, 1865, p. 409. 



t Canadian Nat. and Geol., 1859, iv., p. 364. 



t Occasional Papers, Calif ornian Acad. Sci., 1893, iv., p. 2S0. 



§Bull. U.S. Geol. Survey, 1884, No. 10, p. 36. 



I, Pal. Foss. Canada, Pt. V., 1865, p. 409, 411. 



IT Pal. Foss. Canada, Pt. V., 1865, p. 409, f. 391. 



tt Bull. U.S. Geol. Survey, 1890, No. 63, p. 97. 



