842 MR. T. H. WITHERS ON 



collected by Mr. Park, at Motatapa Island, Auckland. A cai-eful 

 restoration will have to he made before definitely determining 

 this fossil, but it will probably be found to belong to the genus 

 Sccdj)ellum and is distinguished provisionally under the name 

 S. aucJclandictmi. In size, this fossil Cirripede greatly exceeds 

 any previously known, in S. magnuvi the capitulum being only 

 1.7 inches in length, wdiile in the Auckland specimen it is at 

 least 8 inches. These fossils occur in a. breccia, marking the old 

 shore line of the upper part of the Waitemata iSeries, similar 

 to the Cape Rodney beds. The associated fossils are Corals, 

 Brachiopods, and Echinoderms. Among the latter are two 

 specimens having plates of a Cidaris of enoimous size." 



Attention was again called to this fossil in 1903, when 

 Prof. Benham described and figured certain valves. He con- 

 sidered that they showed closei' resemblance to the capitular 

 valves of certain species of PoUicipes, and doubtfully referred 

 them to that genus. 



After an examination of the present material I am convinced 

 that the valves belong to a sessile Cirripede allied to Balanus. 

 There are six compartments — a rosti'ura, carina, right and left 

 lateral, and right and left carino-lateral. Prof. Benham figured 

 only four valves, namely, "a carina, left scutum, ? rostrum, and 

 ? upper latus." The cai-ina figured by him is the same as that 

 now considered as a caiina., and the scutum and ? upper latus 

 correspond to the right and left lateral compartments respec- 

 tively; but the valve figured (Benham, 1903, pi. 10, figs. 8, 9) 

 as a " ? rostrum " is really a carina of Sca^Mluni subplaoiiim, 

 sp. n. (see p. 848). The valves considered here as rostral and 

 right and left carino-lateral compartments were not figured 

 by Benham, and it has now been possible to give figures of the 

 inner surface of each difterent compartment. 



Description of Valves. Valves with solid walls of variable 

 thickness, apparently not more than 2-25 mm. ; externally 

 marked with prominent, more or less regular, transverse growth- 

 ridges, rather more strongly marked on the carina ; sometimes 

 ridged longitudinally, and in one or two cases the valves are 

 distorted by linear depressions ; but all the valves are more 

 or less irregular in shape, and this is obviously caused by th& 

 surface of attachment ; inner surface not longitudinally ribbed 

 near the base as in Bcdamts, for the smooth inner surface slopes 

 gradually to meet the outer surface and forms a definite, more 

 or less smooth edge. 



Rostral compartment (PI. LXXXY. figs. 1-3) without radii, 

 almost symmetrical, moderately convex ti'ansversely and slightly 

 convex longitudinally, bluntly angular at the apex, and either 

 rounded or slightly concave at the basal margin ; triangular in 

 shape when young, but in the older and consequently longer 

 valves the lateral margins for the greater part are almost 

 parallel to each other. On the inner surface two more or less 

 prominent lidges extend from the apex, and die out at a point 

 halfway from the apex in the young valve (fig. 2) and at a 



