STANTON : THE MARINE CRETACEOUS INVERTEBRATES. 3! 



merous well-preserved examples and he could find no essential difference 

 between them and the European forms. Stoliczka refers Serpula phillipsi" 

 to Burtinella, a Gastropod genus related to Tubulostium. 



Locality and position. From mouth of canon four miles east of Lake 

 Pueyrrydon, 300 feet below the Ammonite beds, according to the labels. 

 The material has more the appearance of specimens from the underlying 

 Gio beds or the overlying Belgrano beds. 



VANIKORO (?) sp. 



A single, small, probably immature, specimen has the form and sculp- 

 ture of this genus. The form is stout, consisting of three rapidly increas- 

 ing whorls, with the surface marked by rather prominent transverse lines, 

 or small costae crossed by numerous much finer spiral lines; aperture 

 broadly ovate ; umbilicus rather narrow. 



Height, 6 mm.; breadth, 5.5 mm.; height of aperture, 4 mm.; breadth 

 of same, 3.5 mm. 



Locality and position. From the Ammonite (Belgrano) beds ten miles 

 east of Lake Pueyrrydon. 



LUNATIA CONSTRICTA Sp. nOV. 

 PI. VI, Figs. 10 and 1 1. 



Shell rather small, ovate, consisting of about four convex whorls that 

 are slightly flattened or compressed on the upper third; suture deeply 

 impressed ; aperture ovate, broadly rounded below ; inner lip forming a 

 moderately heavy callus, reflected below, so as to partially cover the nar- 

 row umbilicus ; surface marked by numerous coarse lines of growth and 

 by sharply marked narrow constrictions, or furrows, of which there are four, 

 parallel with the growth lines on the last whorl of the type. 



Height of type specimen, 24 mm.; greatest breadth, 21 mm.; height of 

 aperture, 19 mm.; breadth of same, 12 mm. 



The species is represented by four fairly well-preserved specimens, the 

 best of which is figured. Associated with these are about a dozen more 

 imperfect specimens, some of which seem to have a smoother surface and 

 less elevated form and may belong to a distinct species. 



Locality and position. From the Ammonite (Belgrano) beds, ten miles 

 east of Lake Pueyrrydon. 



