191 



Woods) . Also in the Oamaru and Pareora Series, New 

 Zealand. 



This common species in the Older Tertiary strata of Aus- 

 tralia has been identified with D. Mantelli, equally common in 

 New Zealand, after a comparison of authentic specimens. Prof. 

 Hutton has merged his D. irregularis with that species, and I 

 cannot find any distinctive characters for his D. tenuis, speci- 

 mens of which I have had under examination. However, none 

 of the New Zealand specimens which I have seen have the apex 

 preserved, and no mention is made by either Zittel or Hutton 

 of the presence or absence of an apical slit. 



The ornament of the test of D. JSLantelli is so exceedingly 

 variable in respect to the number, size, and shape of the longi- 

 tudinal ribs that it becomes difficult to select diagnostic cha- 

 racters. In two examples of equal length taken at random the 

 number of ribs at the base of the slit is 17 and 20, increasing 

 at the anterior end to 26 and 50 respectively. Examples from 

 Aldinga have much finer transverse threads. 



D. giganteum, Sowerby (in Darwin's Geol. Obs. on S. 

 America), of which D. solidum, Hutton, is a synonym, is dis- 

 tinct, though conspecific with D. JSLantelli. 



The Rev. J". E. Tenison-AYoods gave the name of D. KicJcsii, 

 Nyst, to a Table Cape fossil, and from his description of it 

 there cannot be a doubt of its identity with D. Mantelli, Zittel. 

 The very brief diagnosis of the Belgian fossil does not permit 

 an identification. 



Entalis subfissura, spec. nov. Plate xx., figs. 4a. — 46. 



Shell thin, subulate, moderately curved, slightly compressed 

 dorso-ventrally, smooth, polished; faintly marked with annular 

 stria? (visible under a lens) and growth ridges. Apical fissure 

 a shallow triangular notch, the embryonal projecting tube 

 prominent. 



Dimensions. — Length, 46 ; dorso - ventral and transverse 

 diameters of aperture, 4 and 4'25 millimetres respectivel} r . 



This species has the general aspect of Entalis Jissur a, Lamk., 

 of the Paris Basin, but the apical fissure is linear and not tri- 

 angular. It may be conspecific with D. Icevis, Hutton, but that 

 species is too incompletely known to permit of satisfactory 

 identification. 



Localities. — Gastropod bed of the River Murray Cliffs near 

 Morgan, and well-sinking at Nine-mile Camp, near Nor'-West 

 Bend ; Muddy Creek, Corio Bay, and Schnapper Point, Vic- 

 toria ; Turritella clays at Blanche Point, Aldinga Bay. 



Entalis annulatum, spec. nov. Plate xx., figs. 6a — 66. 

 Shell nearly straight ; test thick, smooth, polished ; orna- 



