Hector.—On the Belemnites found in New Zealand. 485 
9. Norocarr.—a. Notosiphiti : Fusiform, with a dorsal groove, siphuncle 
on dorsal aspect, and lateral furrows. b. Gastrosiphiti: Subcylindrical, 
with siphuncle on ventral aspect, and short lateral grooves. (Lower 
Cretaceous.) 
Unless it be by certain forms in the liassic strata of the Hokanui and 
Kaihiku ranges of Southland of which only the large phragmacones have 
been preserved, the first of these groups has no species in New Zealand 
representing the Clavati of Europe. 
In the second group, which includes the sub-groups Canaliculati and 
Hastati, there are several species found in the Putataka formation, both in 
the North and South Islands. 
The great majority of forms found in New Zealand belong to the third 
group, but only to its second section, the first section, representing the 
Dilatati of the European neocomian formations, not being present in our 
collection. They are very common in the Amuri series, which is equivalent 
to the lower greensand, and is remarkably rich in belemnites in a perfect 
state of preservation, but they also survive to the horizon of the upper 
greensand. 
The New Zealand forms of this subdivision are characterized by the 
absence of any ventral or dorsal grooves, by a variable form—being cylin- 
drical, hastate, or depressed—by the constant presence of short lateral 
grooves on the upper part of the guard, and the ventral position of the 
siphuncle that traverses the septa of the phragmacone. 
There are five well-marked varieties that might be considered as speci- 
fically distinct were they not so intermixed in the same strata. I have 
referred these to M. Duval-Joave’s subdivision Gastrosiphiti of the neocomian 
belemnites, on account of the position of the siphuncle, which is probably 
of more anatomical significance than the grooves on the external surface of 
the guard; but in the European species a dorsal groove is always present, 
whereas it is absent in all the belemnites I would associate in this group 
from the lower cretaceous formations of India, Australia, and New Zealand. 
Group I.—Acarr. 
1. Belemnites otapiriensis, sp. nov. 
Pl. XXII., fig 1. 
Guard unknown, being only represented by a erushed mass having a 
longitudinal fibrous structure. Phragmacone with from twenty to thirty 
septa, slightly elliptical in form, outline forming an angle of 15°. Siphuncle 
marginal on the major transverse axis, the septa being inserted round the 
aperture so as to form almost a continuous tube traversing the septa. 
This belemnite ranges through the Otapiri series (liassic) down elose to 
the horizon of the Monotis beds of the Wairoa series (triassic), and though 
