part 3] jubassic bocks of new Zealand. 263 



Locality. — Totara Point, Kawhia. 



Remarks. — The specimen described belongs to the N.Z. Geolo- 

 gical Survey. It seems to be rather closely related to 0. bajociensis 1 

 or some variety of that shell which occurs at Bradford Abbas. 

 Shells apparently belonging to this form are plentiful in the 

 sandstones with Inoceramus cf. galoi at Totara Point, but are 

 generally so poorly preserved that the decoration is invisible. 



(c) Lamellibranchiata. 

 Leda sp. (PL XV, fig. 5.) 



Description. — The beak is situated rather forward of the 

 middle of the shell, which is strongly rostrate posteriorly, the 

 rostrate portion having a slight upward curve. This rostrate 

 portion is decorated with growth-lines only. Nearly all the rest of 

 the surface is ornamented with faint rather wrinkled ribs, mostly 

 directed downwards and forwards, but which both below and 

 in front of the beak assume an angular V-shaped character. The 

 V-shaped decoration does not persist to the anterior margin, where 

 the ornamentation becomes very faint. 



Dimensions. — Length=22 mm. : height = 8 mm. 



Locality. — Slope of Flag Hill, Hokonui Hills. Callovian (?). 



Remarks. — The illustration is sketched from a gutta-percha 

 squeeze of the impression of the right valve. This shell belongs 

 to the group of L. rostralis Lamarck and L. graphica Tate, 

 which occur in the English Lias, but the V-shaped decoration 

 extends over more of the surface in the New Zealand specimen 

 than it does in the English forms, where it seems to be more 

 restricted to the posterior surface behind the beaks. 



Paeallelodon egebtoniantts Stoliczka. (PI. XIV, fig. 8.) 



1865. Macrodon egertonianus Mem. Geol. Surv. Ind. vol. v, p. 89 & pi. viii, 

 fig. 7. 



Description. — The beaks are broad, swollen, flattened, close 

 together, and are well raised above and bent over the hinge-area, 

 which is rather wide, concave, and grooved. The anterior margin 

 of the shell is produced along the hinge-line to a rather sharp 

 point, the lower anterior margin being gently rounded. The 

 primary costae are fine and regular, and radiate from the beak ; 

 finer secondary ribs occur between the primary ribs about half-way 

 from the beak to the lower margin. The ribs become much more 

 widely and irregularly spaced on the anterior portion of the shell. 



Dimensions. — Height = 21 mm.; length originally = about 

 45 mm. 



L o c a 1 i ty. — Waikato. 



Remarks. — The figured specimen consists of part of the left 

 valve well preserved and of the corresponding right valve with 



1 W. H. Hudleston, ' Monogr. Brit. Jur. Gasteropoda' 1890 (Pal. Soc.) 

 p. 186 & pi. xii, fig. 3. 



Q.J.G.S. No. 315. u 



