Hector. — On the Belemnites found in New Zealand. 487 



fourth of the total length. Ventral surface of guard with a broad shallow 

 groove continued almost to the apex, and with distinct lateral furrows on 

 the lower third. 



This species is easily recognized from B. aiicJdandicus by the straight 

 central axis of the guard (which is also more slender), the tapering apex, 

 and the weU-marked lateral furrows which are discernible in perfect 

 specimens. 



From grey calcareous marls with Inoceramus haastii that overhe the 

 plant-beds of the Mataura series, Kawhia Harbour, and East Cape district 

 of the North Island. Upper Jurassic. 



Group III. — NoToccELi. 

 B. — Gastrosiijhiti. 

 PI. XXIIL, a-£. 



6. Belemnites australis, Phillips, Q. J. Greol. Soc, XXXVI., 259. 

 Belemnites lindsayi, Hector, N.Z. Geol. Eep., 1873-4, xiii. 



Deep furrows on the dorsal angles of the lateral areas of the anterior 

 portion of the guard extending only slightly beyond the depth of the 

 alveolar cavity. Angle of the phragmacone from 20° to 30°. 



Guard sub-hastate, depressed, trigonal anteriorly, oval in section of 

 middle portion, and terminating in a blunt conical point, sometimes tuber- 

 culate at the apex. Length of guard twice that of the phragmacone. 



Occurs in the calcareous greensands of the Amuri series at Amuri Bluff 

 and Cape Campbell, and in the upper greensands overlying the brown coal 

 at Waipara, Green Island, Waitaki, and Mount Hamilton. 



There is no doubt, I think, that this belemnite is the same species as 

 that described by the late Professor Phillips as a fossil from Queensland, 

 but without any distinct locality or stratigraphical position being assigned 

 to it. 



It is probably also identical with B. sedusus, Blaudford, from the 

 Ootadoor group of the cretaceous formation of India.* 



While this species maintains the above general characters with great 

 constancy, the large series of specimens which I am able to exhibit, 

 upwards of sixty in number, show a wonderful variety in the form and 

 proportions of the guard, even in specimens of similar size. Five distinct 

 forms may be described. 



Var. a. — Lateral furrows short, deep, and straight. Angle of phragma- 

 cone 32°. Guard slightly hastate, with a blunt apex. Alveolar cavity 

 nearly half the length of the guard. 



Var. /3. — Lateral furrows long, shallow, and sinuous. Angle of the 

 phragmacone 28°. Guard fusiform, depressed on dorsal surface. Apex 



* Pal. Ind., 1861, p. 5. 



