80 Transactions. 



height is greater than the width and the marginal angles obsolete, though 

 in medium-sized individuals the angles are very distinct ; the left valve also 

 is invariably much more compressed than the right : and M. dosinijormis 

 by the submedian position of the beak, the more equal slope of the dorsal 

 margins, and the more circular marginal contour. The two species are 

 nearly allied, and closely approach Phacoides (Miltha) sanctaecrucis Arnold 

 (U.S. Geol. Sur. Bull. 396, pp. 57-58, pi. vi, fig. 6, 1919) from the Coalmga 

 District, California, recorded from Lower to Upper Miocene and perhaps 

 Lower Pliocene. 



A fragment of a Miltha was obtained by Dr. Thomson from the Mount 

 Donald beds. It is too small to determine definitely, but is certainlv very 

 near to M. neozelanica. 



A species of Miltha has recently (1919) been described by M. Doello- 

 Jurado from the Tertiary beds of the Argentine in the Entrerienne formation, 

 classed by von Ihering in the Miocene period. 



Couthouyia concinna n. sp. (Plate XVIII, fig. 1.) 



Shell minute, fusiform ; whorls six, rounded and somewhat abruptly 

 contracted at the sutures, apex minute, the two following whorls with fine 

 spiral and axial threadlets, thence the axial riblets prominent, narrower 

 than the interspaces, in places somewhat irregular and wrinkled, the spiral 

 striae very indistinct, Aperture ovate, outer lip almost uniformly curved, 

 basal lip very slightly produced ; columella slightly curved, projecting, and 

 with a small groove separating it from the body-whorl except on the upper 

 third where the peristome is closely united. 



Length, 2*6 mm. ; width, 1-5 mm. 



Type to be presented to the Wanganui Museum. 



Locality: Target Gully. Collected by Marshall. 



There is a single example only ; it is near to the Recent species 

 C. corrugata Hedley. 



Vermicularia ophiodes n. sp. (Plate XVIII, fig. 2.) 



Shell small, apparently solitary, of about seven or eight volutions, which 

 are irregularly and obliquely spirally coiled and attached, with the exception 

 of about one-third of the last coil, which is free and projecting ; the apical 

 whorl is broken and there appear to be internal septa, but there is no indi- 

 cation of septa in the terminal free portion ; the sutures undulating and in 

 places deep ; the dorsal surface of the coils except the last with small some- 

 what irregularly-rounded pustules, frequently perforate, and between these 

 irregularly granose. Viewed from the base the last coil produces a deep 

 and rather elongated umbilicus, the sculpture is small undiilating longi- 

 tudinal threads, somewhat irregular and distinctly granular in places ; the 

 aperture subcircular. 



Greatest diameter of shell, 15 mm. ; greatest diameter of aperture, 

 4 mm. 



Locality : Target Gully. Collected by Marshall. 



Type to be presented to the Wanganui Museum. 



Cymatium suteri n. sp. (Plate XVIII, figs. 3, 4.) 



Shell small, fusiform, aperture and canal shorter than the spire ; whorls 

 six or seven, somewhat rounded, sutures impressed not deep, canal short ; 



