FOSSIL CIRRIPEDES FROM NEW ZEALAND. 849 



fi"om the apex to the basal margin, which is more or less bluntly 

 angular ; tlatly arched transversely and indistinctly carinate. 

 The apical portion of the smaller specimen is thickened to qviite 

 a third of its extent, the inner portion forming almost a fiat 

 surface extending from each side of the carina. 



Length (fig. 1, basal half of valve) 16"5 mm. ; breadth 10 mm. 



Length (fig. 2, basal | of valve) 16"6 mm.; breadth 6-4 mm. 



Scutum trapezoidal, nearly twice as long as wide, divided 

 almost equally by an indistinct, flat, wide ridge extending from 

 the apex to the basi-lateral angle. Occludent margin convex ; 

 basal margin alraost straight. Tergal margin slightly concave, 

 of about the same length as the convex lateral margin, with 

 which it forms an obtuse angle. Along the tergal margin the 

 valve is rounded towards the inner surface. The inner occludent 

 edge is broad, flat, of about the same width throughout, marked 

 with growth-lines, and overhangs the depression for the adductor 

 scutorum opposite the tergo-lateral angle ; the inwardly I'ounded 

 tergal edge is marked with growth-lines, but the extent thus 

 marked narrows rapidly towards the tergo-lateral angle. 



Length (fig. 3, incomplete valve) 28*7 mm. ; breadth 17 mm. 



Tergum subrhomboidal, with an obscure ridge extending in a 

 straight line from the apex to the basal angle, and dividing the 

 valve unequally, the occludent portion being in its widest part 

 almost twice as wide as that of the carinal portion ; lower carinal 

 margin weakly convex, somewhat longer than the scutal margin, 

 and forming with it an acute angle ; upper carinal margin 

 slightly convex, unusually shoi't, and forming an obtuse angle 

 with the slightly convex occludent margin, which is almost twice 

 its length. The occludent margin forms a somewhat raised 

 border, and this is followed by a wide, shallow depression 

 bounded by an obscure ridge extending from the apex to a point 

 on the scutal margin, which is slightly produced about one-third 

 the distance from the basal angle ; from this ridge the valve 

 slopes upwards towards the apico-basal ridge, and slopes rapidly 

 down to the carinal mai-gin. On the inner sur-face a narrow 

 portion of the valve along the occludent and upper carinal 

 margins is marked with growth-lines, and the extent thus marked 

 is wider beneath the apex. 



Length (fig. 4) 20 mm. ; breadth 12-4 mm. 



Rostrum subtrianglar, strongly convex transversely, bowed 

 inwards, basal margin convex ; lateral margins slightly concave ; 

 a flat submediazi keel extends from the apex to the basal margin, 

 and this on the right side is followed by a further longitudinal 

 ridge near the lateral margin, but on the wider left side this 

 ridge, if present, is extremely obscure. 



Length (fig. 5) lO'S mm. ; breadth (when complete) circa 8 mm. 



Subcarina triangular, moderately convex transversely, bowed 



inwards ; apex rounded ; basal margin concave ; lateral margins. 



slightly concave. On the inner surface a slight, but well-defined 



