iV'iin and R(iri' Fossils. 327 



Fam. PLEIHOTOMIDAE. 



Genus PLEUKOTOMA. Larniuck. 



Sul)-geiius DIMLLIA. Gray. 



Plkuuotoma (Dkillia) dilkotoidkk, sp. iiov. (PI. XXVI TT., Fii^. 37). 



Description . — Shell of inediuni size I'or the sub-genus, solid, fusi- 

 form with an acute apex. Shoulder sloping, base contracted, with 

 a short canal. Whorls of the spire Ijicarinate; the body whorl with 

 above five ridges, becoming weaker anteriorly. Apex acuminate, 

 of three smooth whorls, seven whorls to the sjiire. Intel-spaces of 

 carinae covered with closely-set thread-like and sigrnoidal striae. 

 Aperture with a moderately deep sinus, long, ovate and obliquely 

 set. 



Dimensions. — Holotype from Dennant coll. Length. 12 mm. ; 

 greatest width. 5 mm. 



Observafio/is. — The Mallee specimens lieing incomplete, it was 

 necessary to select a fine example from an extensive series in tlie 

 Dennant coll. (Nat. Mus.), from the Kalimnan of the Gippsland 

 Lakes. These specimens were named in MS. by the late Mr. J. 

 Dennant, F.G.S.. as " Drillia cochleoris." That species name, 

 however, has been used in an allied genus, and we therefore re- 

 name it as P. {D.) dilectoides. in reference to its undoubted 

 affinities to Drillia dilecta, Hedley.i The latter species, from 

 moderately shallow water (24-75 fathoms) in the neighbourhood of 

 Port Jackson, is separated, however, by its blunt apex, flatter 

 sides, and longer and more vertical aperture. 



Disfrihvtion. — Bore 6.114-150 feet; 158-161 feet. Bore 8. 

 180-199 feet. 



EXPLANATION OF PLATES. 



Plate XXIV. 



Fig. ] . — Glycimeris inaccoyi, Johnston sp. Form a, with 32 rib- 

 lets. Balcombian series. Grice's Creek, Port Phillip. 

 Coll. \V. ^ershaw. Nat. size. 



1. Mem. Austr. Mus., Meiii. iv., pt. vi., lf»03. (Sci. Results of Trawlin;; Exped., "Thetis"), 

 1>. 387, fiff. 100. 



