part 3] AMMONITES FROM NEW ZEALAND. 309 



EXPLANATION OF PLATES XII-XVIII. 



Plate XII. 



Fig's. Iff, 1 6, & 1 c. Psiloceras (Euphyllites ?) sp. nov. indet. Lower Lias. 



Junction of Taylor's Creek with the Otapiri, Hokonui Hills. 



Natural size. 1 « & lb, side view and cross-section ; 1 c, suture- 

 line, restored and magnified, Trechmann Coll. (See Appendix, 



p. 288.) 

 2a & 2b. Psiloceras sp. cf. calcimontanum (Wfehner). Same locality. 



Natural size. Side-view and sectional outline. N.Z. Geol. Surv. 



Coll. (See Appendix, p. 289.) 

 Fig. 3. Psiloceras (Euphyllites ?) sp. indet. Same locality. Natural size. 



Trechmann Coll. (See Appendix, p. 289.) 

 Figs. 4a & 4b. Psiloceras (Euphyllites?) sp. indet. (juv.). Same locality. 



Natural size. 4 b, suture-line restored and magnified. N.Z. Geol. 



Surv. Coll. (See Appendix, p. 289.) 

 Fig. 5. Rhynchonella sp. Hettangian. Junction of Taylor's Creek with the 



Otapiri, Hokonui Hills. Natural size. Ventral view. Trechmann 



Coll. (See p. 282.) 



6. Oxytoma sp. Same locality. Natural size. Gutta-percha squeeze 



of the left valve. Trechmann Coll. (See p. 272.) 



7. Oxytoma sp. Same locality. Natural size. Left valve showing the 



right valve below it. Trechmann Coll. (See p. 272.) 



8. Oxytoma sp. Same locality. Natural size. Cast of the left valve. 



Trechmann Coll. (See p. 272.) 



9. Oxytoma sp. Same locality. Natural size. Cast of the left valve. 



Trechmann Coll. (See p. 271.) 

 10. Pteria cf. contorta Portlock. Slopes of South Peak, Benmore (Hoko- 

 nui Hills) ; Kluetic (P). Natural size. Cast of the left valve. 

 N.Z. Geol. Surv. Coll. (See p. 273.) 

 Figs. 11 a & 11 b. Pleurotomaria sp. Hettangian (?). Lower Ammonite-Bed 

 at Taylor's Creek, Hokonui Hills. Natural size. Gutta-percha 

 squeeze, showing the spiral and umbilical aspect. N.Z. Geol. Surv. 

 Coll. (See p. 261.) 



Plate XIII. 



Figs, la & lb. Astarte spitiensis Stoliczka. Bathonian-Oxfordian. Totara 



Point, Kawhia. Natural size. Left valve, and anterior aspect of 



the same. Trechmann Coll. (See p. 279.) 

 Fig. 2. Astarte cf. sowerbyana Holdhaus. Same locality. Natural size. 



Left valve. Trechmann Coll. (See p. 280.) 

 3. Astarte cf. scytalis Holdhaus. Same locality. Natural size. Eight 



valve, outline restored. Trechmann Coll. (See p. 280.) 

 Figs. 4a & 4b. Astarte (Opis?) morgani, sp. nov. Same locality. Natural 



size. Left valve and anterior aspect of the same. Trechmann 



Coll. (See p. 280.) 

 Fig. 5. Astarte (Opis?) morgani. Same locality. Natural size. Eight 



valve of another specimen. Trechmann Coll. (See p. 281.) 

 Figs. 6-9. Trigonia kawhiana, sp. nov. Southern shore of Kawhia Harbour. 



Natural size. Gutta-percha squeezes of the right and left valves. 



N.Z. Geol. Surv. Coll. (See p. 277.) 

 Fig. 10. Oxytoma sp. Southern shore of Kawhia Harbour. Natural size. 



Left valve. N.Z. Geol. Surv. Coll. (See p. 273.) 



11. Pecten (Gamptonectes) cf. lens J. Sowerby. Bathonian-Oxfordian. 



Totara Point, Kawhia. Natural size. Imperfect left valve. 

 Trechmann Coll. (See p. 276.) 



12. Amberleya Zealand ica, sp. nov. Same locality. Natural size. 



Trechmann Coll. (See p. 262.) 



