264 DR. C. T. TRECHMAXN ON THE [vol. lxxix, 



only part of the shell remaining, and the posterior part of both 

 valves missing. The locality is rather uncertain, hut apparently 

 the shell came from Waikato. Mr. J. A. Bartrum has recently 

 sent me, among other fossils that he collected at Waikato, a small 

 and well-preserved specimen of this shell measuring 16 mm. in 

 length and 9 mm. in height, which confirms its specific attribution, 

 and shows that the ribs become nearly obsolete at the posterior 

 portion of the shell. It also shows the curious feature mentioned 

 by Dr. K. Holdhaus and Mr. R. B. Newton, namely, that the 

 right valves of all the specimens have a series of intermittent ribs 

 between the prominent radiating costse, which are entirely absent 

 on the left valve, where the costse are fewer and wider apart. 



The species is a well-known one from the Spit! Shales of the 

 Himalayas. 1 



Mr. R. B. Newton 2 has recorded the interesting fact of the 

 occurrence of this shell in a river-bed at Bihin, in Somaliland. 

 He also records it from near Dihala, north of Aden, in beds 

 supposed to be of Corallian age. 3 



Among the Australian Cretaceo- Jurassic lamellibranchs from the 

 Desert Sandstone of Maiyborough, in Queensland, Cucullcea 

 roh ust a R. Etheridge fil. is very suggestive of this form. 4 



Aucella. 



The An eel Ice that I possess from New Zealand offer some 

 puzzling features : they are from three distinct localities, and 

 probably also from as many distinct horizons : — 



(1) Kohai Point, Kawhia Harbour, where they occur associated with 



Inoceramus haasti. 



(2) Specimens from the South Head at Waikato, collected by Prof. P. 



Marshall and Mr. J. A. Bartrum. 



(3) Specimens of a new form, doubtfully referable to the g'enus Aucella, 



collected by Prof. Marshall on the south-eastern coast of the South 

 Island. 



The original specimens collected by the Novara Expedition and 

 described by Zittel as A. plica ta 5 came from the South Head at 

 Waikato. The illustrations comprise three views of one specimen, 

 are not very clear, and seem to represent a shell with part of the 

 margin broken away. Boehm, however, examined seven specimens 



1 K. Holdhaus, ' Fauna of the Spiti Shales (Lamellibranchiata & Gastero- 

 poda) ' Pal. Ind. ser. 15, vol. iv (1913) p. 434 & pi. xcv, figs. 1-10. 



2 ' On the Occurrence of an Indian Jurassic Shell, P. egertonianws, in 

 Somaliland' Geol. Mag. 1896, p. 294. 



3 Ann. & Mag. Nat. Hist. ser. 8, vol. ii (1908) pi. i, figs. 1-4. 



4 J. L. Jack & R. Etheridge, ' Geology & Palaeontology of Queensland ' 1892. 

 p. 565 & pi. xxvi, figs. 1 & 4. 



5 ' Palaontologie von Neu-Seeland' 1864, p. 32 & pi. viii, figs. 4«-4r; 

 the'plate is also reproduced by Prof. J. Park in his ' Geology of New 

 Zealand' 1910, p. 78. 



