HORN EXPEDITION — PALAEONTOLOGY. 103 



sliarply keeled at .il)Out tlie anterior one-third. Tn the middle line of the posterior 

 area tliere is a distinct shallow depression, which, with the revolution of the spire, 

 decreases in conspicuity, and is finally obliterated on the body-whorl. Sui-face 

 apparently without sculpture. Last whorl somewhat flatly depressed below tlie 

 bluntly-keeled periphery, thence abruptly sloping to the l>ase. Aperture rhombic- 

 oval, about as wide as high ; columella arched in the vertical plane, very conxex 

 transversely. Length, 22 nun. ; l)readth, 16 nun. ; aperture, 12 mm. high, niin. 

 wide. A large example of two whorls has a length of 31 nun. 



Loc. — In limestone, at Middle Valley, Tempo Downs. 



Obs. — Tlie general aspect of this fossil is that of Encyc/ns, but the columella 

 does not agree with it or other Littorinida^ ; it is rather that of Tuibinidie. Tt 

 also recalls some of the Pleurotoiiiariu', notably the Ordo\ician Mitrchisoiiia 

 gvrogonia, McCoy, Biit. Pal. Foss., p. 293, pi. i., k, fig. 43, liut the keel on the 

 whorls is not a fascia, and a reference to that genus is not pcrmissable. Tlie 

 imperforate base removes it from Troc/ioiwi/ta. 



Raphistoma brownii, Etheridge, lils. 



IieJ.—\\., p. 9, pi. i., figs. 1-3. 



Obs. — This fossil is abundant in the state of loose casts on the limestone 

 outcrops near camp on Laurie's Creek, noitli of Teinpe Vale, and Pcteiniann 

 Creek. Two specimens show traces of ornament on the und(M'side in tiie foini of 

 oblique growth-lines and slender undulations, which are abruptly retroverted at 

 the keel, and thus indicate the jiresence of a peripheral sinus ; but there is no 

 trace of a fascial band. A lai'ge example has the following measures : — Diametei's, 

 90 mm. and 8.5 mm. ; height, 2G mm. The diameter of the umbilicus is about 

 one-third that of the base, but is much lessened with the inci'easing con\exity of 

 the base. 



By comparison of an equally-sized specimen of Raphistoma brflwnii with the 

 figure of Straporolhis {Maclaria) iasiiiaiiiciis, Johnston, " Geology of Tasmania," 

 pi. v., I am inclined to regaid the two as conspecific, but as the l)ase of the 

 Tasnianian shell is not shown it will not Ije safe to be positive as to their identity. 

 A comparison of actual specimens can alone permit of a definite opinion. 



Scalites (?) eremos, sp. nov. (Plate III., Fig.s. 28(7, 28/^.) 



Sp. char. — Shell biconic ; spire-whorls four, fiat, without sculpture or orna- 

 ment, separated by a linear impressed suture. Hody-whorl angulated at the 



