852 MR. T. 11, WITHERS ON 



Tergum svibtriangular, convex transversely, tliick, elongated, 

 with a prominent, nearly straight lidge, extending from the apex 

 to the basal angle. On both sides of this ridge the valve slopes 

 rapidly to the outer margins. Carina! margin gently convex ; 

 occludent margin gently convex, with a raised border, followed 

 by a wide depression, extending from the apex to about half the 

 width of the scutal margin, which is indented to that extent. 



Length (fig. 9, incomplete valve) 21 '4 mm. ; breadth 10'8 mm. 



Upper latns subtriangnlnr, thick, convex transversely and 

 longitudinally ; umbo a little below the apex, owing to a thick 

 ledge formed beneath it, which extends from the lateral angles to 

 just beyond the umbo. Scutal margin slightly convex, its upper 

 surface forming a prominent ridge, followed by a wide depression, 

 which is bounded by an indistinct ridge, and between these two 

 ridges the growth-lines are abruptly iipturned ; a second in- 

 distinct ridge runs almost jDarallel to the slightly convex tergal 

 margin, and between these the growth-lines are also abruptly 

 upturned. 



Length (fig. 10) 15-4 mm.; breadth 1.3"5 mm. 



Kostral latus about four times as wide as long, Avith a promi- 

 nent, rounded, wide ridge extending its whole length, from which 

 the surface of the valve slopes rapidly ; outer (rostral) extremity 

 bluntly angular, much thickened, and this must have projected 

 freely more than one-third the extent of the valve ; inner 

 (lateral) extremity obliquely truncated. Scutal margin concave, 

 slojoing upwards to the inner margin of the thickened portion, 

 and then descending rapidly in a curve to the umbo ; basal 

 margin straight and almost parallel to the inner two -thirds of 

 the scutal mai'gin. 



Length (fig. 12) 4-4 mm.; breadth 15"1 mm. 



Remarks and Comparison toith other Species. In a paper by 

 Dr. G. A. Mantell* (1850, p. 329) a Cirripede from the Ototara 

 Limestone (Miocene, Upper Oamaruian) is recorded as '''■Pollicipes, 

 resembling a Cretaceous species." There is nothing to indicate 

 whetl\er this is the present species or not. The two scuta 

 figured by Zittel t as " Cirrhipedenschalen," and recorded from 

 Whaingora and Aotea, North Island, New Zealand, are certainly 

 distinct from the present species. Zittel's figures were sub- 

 sequently reproduced and recorded as Scalpelluin sp. by Prof. 

 James Park J, who considered the specimens to be of Miocene 

 (Upper Oamaruian) age. 



* 1850. G. A. Mantell, " Notice of the Remains of tlie Dinornis and other Birds 

 and of Fossils and Rock-Specimens, recently collected by Mr. Walter Mantell in 

 the Middle Island of New Zealand ; with Additional Notes on the Northern 

 Island. With^ote on Possiliferous Deposits in the Middle Island of New Zealand, 

 by Prof. E. Forbes." Quart. Journ. Geol. Soc. London, vol. vi. pp. 319-343, 

 pis. xxviii., xxix. 



t 1865. K. A. Zittel, " Possile Mollusken und Echinodermen aus Neuseeland," 

 Palaontoloo-ie von Neuseeland (Novara-Exped.), Geol. Teil., Bd. i. Abth. 2, pi. ix. 

 figs. 12 a, 6. 



X 1910. J. Park, ' Geology of New Zealand,' p. 141 (pi. xii.), figs. 9 a, h. 



