Victorian Fossils, Part XIX. 87 



Coelocaidus fipicalif, sp. nov. (Plate III., Figs. 23, 24). 



Description. — Shell soinewliat like C . hircieri, but spire more acute 

 and with a more numerous apical series of whorls. Apical angle 

 about 25 deg. Whorls depressed convex to flat, short and numerous 

 near the apex, numl:>ering altogether about 20. Sutures well 

 marked, but not widely channelled. Slit-band median or slightly 

 below the median line, depressed in earlier convolutions, prominent 

 in later ones and bordered by raised threads alwve and below. 

 Umbilical axis open to apex. Cast of perforation more regularly 

 cylindrical than in ('. hrazieri. 



Dimensions. — A smaller shell than G. hrazieri, measuring in the 

 type specimen 40 mm. in length and 16.5 mm. at the base (so far 

 as preserved). 



Oh.^erv'itinns. — The above species appears to occupy a middle 

 position between Coelocauliis hrazieri and C . daruinii. From 

 several examples of the latter species collected by Mr. A. J. Shearsby, 

 one is able to note some interesting points of comparison. It is 

 smaller and more slender in the apical half of the shell than either 

 of the Victorian Silurian species; whilst in the numerous whorls 

 and the cylindrical form of the hollow columella it agrees with 

 C. apirrilis. The examples of 0. darwinii from the Shearsby col- 

 lection cam.e from the Middle Devonian of Yass (Portion 208, Par. 

 Waroo), New South Wales. De Koninck gives the Yass district as 

 the locality, and refers it to the Devonian, whilst Mr. Etheridge 

 refers it to " the Upper Silurian, probably Wenlock, beds of Yass."l 



Genus Cyrtostropha, Donald. 

 Cyrtostropha lilydalensis, sp. nov. (Plate IV., Figs. 26-28). 



Description. — Spire of moderate length, turriculate; consisting 

 of eight whorls, including the protoconch. Sides of whorls convex 

 with the sutures deeply incised. Sinus band median. Growth- 

 lines moderately oblique above and curving backward to the band, 

 and forward below; lines conspicuous on the sinus-band. Band 

 bordered Avith strong raised lines above and below. Rest of whorl 

 relieved with about three threadlike or slightly nodulose lirae above 

 and l)elow the band. Aperture longer than broad, columellar 

 margin slightly produced. Umbilicus closed. 



Dimensions. — Length of holotype (incomplete at base), 31 mm. ; 

 width at base about 12 mm. Length of body whorl about 14 mm. 



1 Rec. Austr. Mus., vol. i., No. 3, 1890, p. 6.3. 



