380 HENKY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFIC^ 



forms, figs. 4, 5, agree well with L. ventricosa Silvestri (lOOS} 

 iigs. 6a-e. 



PI. 14, fig. 6, has a band of clear shell-substance running round 

 the test and orifice. Orifice fissurine. Only five found. There 

 appears to be no internal tube. Local it f/ : Uncertain. 



Lagena globosa Montagu sp. (PI. 14, figs. 7-9, bilocular 



forms, figs. 7, 8). 



I think there is no doubt that figs. 7, 8 represent L. globosa in 

 the bilocular state, and they are interesting from several points of 

 view. 



There are only six recorded from these gatherings, but many 

 more occur in the Penguin collection. Taking the two to- 

 gether one could arrange a complete series as regards size, from 

 the smallest to the largest. In the smallest tests (single-cham- 

 bered) fig. 9, a portion of the oral end appears to be solid except 

 for the tubular passage through its centre, and the entosolenian 

 tube is not always present. As regards these it is possible that 

 they bear no relation to the bilocular examples, but they have 

 every appearance of doing do. If I am right in my surmise it 

 would appear that the animal had the power of expanding the- 

 solid portion at the oral end into a second chamber, and this 

 would imply that it also increased the size of the initial chamber, 

 for the second is never present in the smallest size. In the bilo- 

 cular forms the solid portion is absent in both chambers. Locality r 

 OM specimens only at Nos. 1, 3, 18, 28, 29, 30. 



Lagena globosa Montagu sp. var. nov. macidata (PI. 14, 



figs. 10, 11). 



Test globular or sub-globular, generally transparent, with four 

 small, oval, opaque spots, placed equidistant from each other 

 round the middle of the test, or slightly above the middle. 

 Entosolenian, the tube being free and curiously coiled back upon 

 itself. Aperture fissurine. Very rare. I^ocalitij : Nos. 1, 32. 



Lagena globosa Montagu sp. var. nov. anmdata (PI. 14, 



fig. ] 2). 



Test globular, entosolenian. A rather opaque band or ring 

 surrounds the test near its base. 



