part 3] jueassic rocks of new Zealand. 261 



New Zealand examples the furrow extends farther towards the 

 apex, while the apex is blunter and the guard is rather thicker. 



Belemnites (Belemnopsis) sp. (PI. XVI, fig. 13.) 



Description. — The ventral furrow is faint and shallow, and 

 extends from the alveolar region backwards to three-quarters of 

 the distance to the apex, where it gradually widens, becomes 

 shallower, and disappears. The cross-section is nearly circular 

 throughout, gradually increases posteriorly, and is thickest (6 mm.) 

 about where the furrow dies away ; it narrows thence to the apex, 

 which is rather acutely pointed. 



Dimensions. — A specimen comprising the guard and a small 

 part of the alveolar chamber has a length of 70 mm. 



Locality. — Te Puti Point, Kawhia, in sittc in the cliff. 



Remarks. — This belemnite seems to be a distinct species from 

 the last-described one. I possess a perfect guard from which the 

 •description was drawn up, and others more or less fragmentary. 

 It is comparable in some ways with a specimen described as 

 B. cf. lagoicus Bcehm, but is smaller and narrower, and the 

 furrow in the New Zealand example extends farther backwards. 



B. lagoicus Bcehm occurs at the fossil locality on the Upper 

 Lagoi Biver, on the Island of Taliabu, in beds which are thought 

 to approach the junction of the Jurassic and Cretaceous. The 

 belemnites at Te Puti, therefore, seem to agree with the ammonites, 

 found lying on the shore there, in pointing to a high Jurassic 

 horizon, probably Kimmeridgian. 



(b) Gasteropoda. 

 Pleurotomaria sp. (PL XII, figs. 11 a & 11 b.) 



Description. — Shell thick, consisting of five or six whorls, 

 increasing rather rapidly. Spire depressed, almost flattened, 

 sutures excavated, and whorls concave above, sloping to the suture, 

 decorated with a line of coarse blunt nodes, just below which, and 

 a short distance above the suture, traces of the slit-band are visible. 

 The outer keel is decorated with a line of smaller nodes. The 

 shell is widely and deeply umbilicate below, the sutures being 

 deeply excavated. The whorls are swollen below, and are decorated 

 with a line of coarse and irregular nodes which point rather ante- 

 riorly. Growth-lines are well-marked and irregular. 



Dimensions. — Diameter = about 40 mm.; height = about 

 17 mm. 



Locality. — The lowest part of the Lower Ammonite-Bed at 

 Taylor's Creek (Hokonui Hills), below the woolshed, collected by 

 Mr. A. McKay in 1878, locality No. 358. The horizon is given 

 as Lias. Remains of other fossils on the rock show that it is 

 Jurassic, and not Trias. Hettangian (?). 



Remarks. — A fragmentary cast in the N.Z. Geological Survey 

 collection yielded gutta-percha squeezes from which the diagnosis 



