754 LIMESTONES AND TUFFS OF MALEKULA, N.H., 



The interesting genus TrilUna contains only one species so far 

 as known, which was first described in detail by M. Schlumberger 

 under, the name of T. hoiochini. It was previously discovered 

 by the Rev. W. Howchin, who had identified it with Quiuque- 

 loculina prisca Terquem,"^ The specimens were originally found 

 by Mr. Howchin in the lower bedsf of Muddy Creek, near 

 Hamilton, Victoria; they are there " moderately common." The 

 same species has been recorded by Schlumberger as occurring 

 very commonly in the Isle of Zebu in the East Indian Archi- 

 pelago,;!: together with a species of Siginoilina. It is noteworthy 

 that the latter genus is similarly present in association with 

 Trillina in one of the limestones from Malekula. 



Trillina howchini occurs only in one sample of limestone in 

 our series, namely that from BartalepjDe, Malekula (No. 105). It 

 is an abundant form, and easily recognisable in thin sections of 

 the rock. Although isolated specimens were not obtained, the 

 characters of the variously orientated sections of the tests are in 

 every way identifiable with the clearl}^ described and illustrated 

 species established by Schlumberger. Both the megalospheric 

 and microspheric forms appear to be here represented. The 

 associated genera in this limestone are Sjnroloculina, Miliolina^ 

 Sigmoilina, Alveolma, Truncatulina, Carpe7iteria, Gyjysina, Mio- 

 gypsina^ Opercidina, and Lepidocyclina. 



Alveolina cucumoides, sp.nov. (Plaite XXX viii,, figs. 5-6). 



AlveoUna sp. Yerbeek, 1896, Descr. Geologique de Java et 

 Madoura, YoLi. p.lU2, pl.ii. fig.43. 



Description. — Test elongately fusiform; thickest in the middle, 

 more or less constricted on either side, and tapering to a blunt 

 point at either end. The convolutions number 8 or 9 in the 

 adult shells. Chambers ovoid, the outer roof slightly arched. 



* Trans. Roy. Soc. S. Australia, Vol.xii. 1889, p. 2. 



t Not the upper beds, as stated by Schlumberger, loc. cit. p. 120. 



X Loc. cit. p. 123. 



