]t',(; Frederick Chapman: 



and it also has a narrow glabella; the body, however, is not so 

 -elongate as in C. angustior, and it is a typically smaller form. 



G. blumcnbachi has a wider and more evenly convex gabella, and 

 the neck furrow is, as a rule, not so strongly marked. Moreover, 

 the r.ings of the axis are not conspicuously tuberculate, as in G. 

 tuberculosa, G. angustior and C. niagarensis. The granulose sur- 

 face agrees with that of C. tuberculosa rather than with G. blumen- 

 bachi. 



//or r.on and Occurrence. — Silurian (Yeringian). Holotype and 

 paratype from Ruddock's quarry, near Lilydale; in olive brown 

 mudstone. 1 Presented by Mr. J. S. Green. 



Silurian (probably Yeringian). Range on E. side of commonage, 

 Kilmore; Coll. Geol. Surv. Vict. (Bl> 23.) — A nearly complete 

 eephalon in reddish coloured sandstone. Also Kilmore Creek, 

 north of the special survey. Coll. Geol. Surv. Vict. (Bb 20). — A 

 cephalon in indurated mudstone. 



Calymene cf. bhimenbacht, Brongniart. 2 (Plate XV., Fig. 11). 



Remarks.- — A cephalon, tentatively referred to the above species, 

 is found in the Victorian Yeringian series. It is characteristed by 

 its broad and strongly convex glabella, and in this respect quite 

 unlike the previously described G. angustior. The anterior limb 

 bordering the glabella is deeply furrowed behind, and its horizontal 

 margin gives a subquadrate aspect to the cephalon. The lateral 

 tubercules are even larger than G. angvstior. 



To the above species I have also referred a well-preserved speci- 

 1 1 i+i i from the Melbournian of Moonee Ponds Creek, Flemington. 

 This consists of thorax and pygidium, in which the width of the 

 -carapace exceeds that of the Yeringian species, G . angustior. 



G. blumetibachi also appears to occur in New South Wales, in 

 the Hume beds of the Bowning district, if I am correct in referring 

 i" i hat species the form figured by ('. Jenkins 3 under the name of 

 Calymene duplicata, Murchison. 



Horizon and Occurrence. — Silurian (Yeringian). Yellow, sandy 

 mudstone; sect. 12, parish of Yering, Geol. Surv. Vict. 



i Vttaohed t., the same slab as the holotype is a cast of Nucula opima, .1. Hall, var. austraiit, 

 < htipm.,a variety already described from both the Melbournian and Yeringian facies >■! the Vie- 

 '.mum Silurian (Mem. Nat. Mus. Melbourne, No. 2, 1908, p. 31, pi. mil. , figs. 30-43). 



2 For references see antra. 



:: I'roe. Linn. Soc, \ .8 Wales, vol. iii., 1879, p. 27, pi. \i., fig. 4. 



