Hutton. — Three New Tertiary Shells. 473 



Length, 120 mm.; width, 30 mm.; length of aperture, 

 54 mm. 



Locality. — Waihao Forks. Collected by Mr. Harold 

 Hamilton. 



The type is in the Canterbury Museum. 



Mitra hectori. Plate XLIV., fig. 2. 



Shell elongato-fusiform, the aperture about as long as the 

 spire. Pullus conical. Whorls of the spire 7 (not counting 

 the pullus), nearly flat, separated by a channelled suture, 

 with a rounded shoulder ; smooth ; ornamented with 3 dis- 

 tant, low, very obscure spiral ribs. Body-whorl with a low 

 obscure spiral rib near the shoulder, and distinctly spirally 

 ribbed at the base, the central portion smooth and rather 

 flattened. Aperture narrow, outer lip thin ; columella with 

 4 well-marked plaits, of which the posterior is rather the 

 largest. There are no longitudinal striae. 



Length, 45 mm.; width, 13 mm.; length of aperture, 

 22 mm. 



Locality. — Waihao, near the coal-mine. Collected by Mr. 

 Aug. Hamilton. 



The type is in the Canterbury Museum. 



Pectenhilli. Plate XLIV.. fig. 3. 



Large, equivalve, rather compressed, equilateral, sub- 

 orbicular. Ears large, equal, without any sinus ; the pos- 

 terior with 3, the anterior with 4 slightly undulating ribs. 

 Eight valve with about 30 narrow ribs, many of which are 

 grooved in the ventral half of the shell, and slightly roughened 

 by growth-lines. Interstices broader than the ribs, smooth, 

 simple. The left valve is imperfectly preserved, but what can 

 be seen of it does not differ much from the right valve. 



Length, 4-55 in. (116 mm.); height. 4-25 in. (108 mm.); 

 thickness, l - 55in. (40mm.). 



Locality. — Napier, in limestone. 



Allied to P. triphooki, but distinguished from that species 

 by the narrower and more numerous ribs, which are not so 

 scaly, as well as by the simple interstices. 



The type is in the Canterbury Museum. 



EXPLANATION OF PLATE XLIV. 



Fig. 1. Pleurotoma hamiltoni, Waihao Forks. 

 Fig. 2. Mitra hectori, Waihao, near the coal-mine. 

 Fig. 3. Pecten hilli, Napier. 



