848 MR. T. H. WITHEES ON 



the comj)aTtments of Bexelasma aucklandicum and the valves of 

 Sccdpellum sithplamtm, sp. n. Those that I have been able to 

 extract and clean appear to be somewhat worn, and the largest 

 of them does not measure more than 5 or 6 mm. in length ; their 

 outer walls are thrown into comparatively wide longitudinal 

 folds. Owing- to their worn appearance the finer characters are 

 not well shown, but since they do not appear to possess radii 

 they must be referred to the genus Hexelasma. They differ, 

 however, from the typical species of Be.velasma, as well as from 

 the fossil JI. aucklandicum, in having a well-developed sheath, 

 and in the presence of strong ribs on their inner surface. Balanus 

 Aoe^iVwrns Pilsbry (1911, " Barnacles of Japan and Bering Sea," 

 Bull. Bureau Fisheries, Washington, vol. xxix. 1909, p. 77, 

 text-fig. 8), which has now been referred by Dr. Hoek to Ins 

 genus Hexelasma, agrees with the present compartments in the 

 presence of ribs on the inner surface, but it would be rash to 

 say that they are related specifically. In view of the imsatis- 

 factory preservation of these compartments, and in the a,bsence 

 of the opercular valves, I do not think it advisable to institute a 

 new species. 



Horizon and Locality. Miocene, Oamaruian, Base of Waitemata 

 Beds; Motutapu Island, Auckland Harbour, New Zealand. 



Collection. Geol. Surv. New Zealand. 



P0LLICIPEDID.E. 



Genus ScALPELLUM. 



1817. Scaljiellum Leach, Joiu-n. de Physique, &c., Ixxxv. p. 68. 



ScALPELLUM SUBPLANUM, sp. n. (PI. LXXXVI. figS. 1-6.) 



1903. Follicipes {'i) aucldandicus Hector sp. : W. B. Benham^ 

 Geol. Mag. dec. 4, vol. x. p. 114, p). 10, figs. 8-9. 



Diagnosis. Carina not separated into tectum, parietes, or 

 intiaparietes, flatly arched transversely, basal maigin bluntly 

 angular ; tergum with the upper carinal margin unusually short, 

 and ma-king with the occludent margin an obtuse angle ; rostrum 

 with a wide, flat median keel extending from the apex to the 

 basal margin. 



Material. 2 carinse, 2 scuta, 4 terga, 1 i-ostrum, and 1 sub- 

 carina ; most of these are incomjjlete, and they were all extracted 

 from the matrix containing the valves of Hexelasma aucJdandicum^ 



Holotype. The carina figured on PI. LXXXVI. fig. 2. 



Collection. Geol. Surv. New Zealand. 



Horizon and Locality. Miocene, Oamaruian, Base of Waitemata 

 Beds : Motutapu Island, Auckland Harbour, New Zealand. 



Carina not separated into tectum, parietes, and intraparietes, 

 bowed. moderately either inwards or outwards, widening gradually 



