STANTON : THE MARINE CRETACEOUS INVERTEBRATES. 
31 
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 11. 
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. 
