840 MR. T. H. WITHERS ON 



47. Some Miocene Cirripedes of the Genera Hexelasma 

 and Scalpellum from New Zealand. By Thomas H. 



Withers, F.G.S.* 



[Received May 6, 1913 : Read June 3, 1913.] 

 (Plates LXXXY. & LXXXYI.t & Text-figures 139, 140.) 



Index. 



Page 



Introduction 840 



Hexelasma aucMandicttm Hector sp 841 



Structure and Affinities of H. aticJclandicum 846 



Hexelasma sp 847 



Scalpellum subplanum, sp. n 848 



Scalpellum (Arooscalpellum) iingulatum, sp. n 850 



Distribution (Geological) 841,848,851 



This paper contains the results of a study of the remains of 

 the " gigantic Cirripede " ( = Hexelasma aitcJdandicum) from 

 New Zealand, as well as some notes on a smaller species of 

 Hexelasma, and descriptions of two new species of Scalpellum. 

 One of the latter is founded on some valves in the Geological 

 Department of the British Museum, and the remaining species 

 'of Scalpellum and the small Hexelasvia were found associated in 

 the matrix with the remains of Hexelasma aucklandicuin. 



Remains of a gigantic Cirripede have long been known to 

 occur in the Waitemata Beds (Miocene) of Motutapu Island, 

 Auckland Harbour, New Zealand. These remains have been 

 considered by Sir James Hector (1887) and Prof. W. Blaxland 

 Benham (1903) as belonging to a pedunculate Cirripede; but 

 while the former referred them to the genus Scalpellum, the 

 latter thought that they approached more closely to the genus 

 Pollicipes. 



On learning of my wish to see some of these remains, 

 Prof. James Park was good enough to write to Dr. J. Allan 

 Thomson, Palaeontologist to the Geological Survey, Dominion 

 Museum, Wellington, who most kindly sent me the actual 

 specimens collected by Prof. Park in 1887. Prof. Park wrote 

 also to Prof. Benham, who sent me plaster-casts of the specimens 

 figured by him in 1903; these casts are now in the Geological 

 Department of the British Museum. My thanks are therefore 

 due to Professors Benham and Park and Dr. J. Allan Thomson, 

 and I have also to acknowledge the kindness of Dr. A. Smith 

 Woodward in allowing me to describe the new species of 

 Scalpellum in the Geological Department of the British Museum. 



* Communicated by Dr. W. T. Calman, F.Z.S. 



f For explanation of the Plates, see p. 854. j 



