& 



BY R. ETHERIDGE^ JUNR.^ AND JOHN MITCHELL. 653 



labella furrows of Croiuas, the other (Fig. 9) is said to "porte 

 quatre silloiis trans verses non iiiterrompus,' which is not a char- 

 acter of the genus in question. Now what happened we beheve 

 to be this. The pygidium referred to C. mufchiso7d (Fig. 96) is 

 probably that described (but not ostensibly figured) under E. 

 Barrandfl, for De Koninck says of the former — "La joue mobile 

 et Tangle genal me sont inconnus. II en est de maiie du thora.n 

 et du pygidiimi' (the italics are ours). If, therefore, the pygidium 

 is unknown, how can the subject of Fig. 9/^ be referred to Croiuiis 

 innrrhisoni, as it is in the explanation of Plate i.? Accepting the 

 illustrations of the two cephalons in good faith, they appear to 

 us to represent distinct forms of Encrinurus \)\\vq and simple, 

 one with a broad-necked glabella (Fig.9r^), and scattered small 

 granules, the othei- with a distinctly pyi-iform glabella, and foui* 

 very mai-ked, continuous, postei'ioi*, transverse lines of granules 

 parallel to the neck-ring, in addition to the scattered ones on the 

 fore part of the glabella. 



2. Victoria. 



One species only is so far known from this State — Encrinurus 

 {Cromas) sprt/i, Chapman,* from the Upper Silurian rocks ex- 

 posed in the progress of the Improvement Works, South Yarra, 

 Melbourne, and other neighbouring localities. It appears to 

 differ from our type-species, E. mitcheUi, chieily by the presence 

 of "two deep transverse sulci above the neck rings interrupted 

 in the middle." The presence of these sulci forbids a reference 

 to Encrinurus as here understood by us, and equally the exist- 

 ence of only two pairs is fatal to the inclusion of this trilobite 

 in Cromus, as established and defined by Barrande, in which 

 there are four pairs of glabella furrows. 



3. Tasmania. 



In the "Report of the Secretary for Mines [of Tasmania] for 

 1895-6" are the descriptions of Tasmanian Silurian fossils pre- 

 sented to the Australian Museum by Mr. A. Montgomery, Gov- 



* Chapman, Proc. Roy. Sue. Vict., 1911, xxiv. (n.s.), Pt.l, p. 397, PI. 

 Ixii., fig 1. 



