206 HENRY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFIC. 



intervals across the test. It being a solitary example I do not 

 care to make a section of it, but probably it would reveal a series 

 of chambers. As Mr. Thornhill has placed it among the Lagena, 

 and it is such an interesting object, I cannot resist the oppor- 

 tunity of figuring it. It is opaque, but the single-chambered 

 specimen was quite transparent. Locality : No. 42. 



Lagena maculata sp. nov. (PI. 18, fig. 25). 



I was unable, for various reasons, to make out the nature of 

 this interesting species, so submitted the test to Mr. Earland, and 

 he has kindly sent me the following description of it : 



"The shell appears to consist of two, probably three layers. 

 An inner test which is covered with a raised hexagonal outline 

 pattern, like network over a ball, and this in turn is covered 

 with an extremely thin outer test. This latter may be merely 

 chitinous or membranous ; it is sufficiently thin to show diffrac- 

 tion spectra. "Where this outer layer is stretched over the raised 

 pattern it is depressed in a rounded fashion, as though it had 

 been pressed down with the tip of the finger into the hexagonal 

 cavity beneath." 



A solitary example. It belongs to the Waterwitch set of 

 Lagenae. Test not compressed. 



Locality : No. 13. Station 238, Lat, 12"44' S., Long. 179*09' W. 

 (1,050 fms.). 



Lagena marginata Walker and Boys var. ventricosa Silvestri. 



Lagena ventricosa Silvestri, 1903-1904, Accad. Reale delle Scienze 

 di Torino, p. 10, figs. 6 a-e. 



This seems to me simply a stout form of L. marginata. There 

 are eleven large specimens, but the carina is carried a little 

 farther up the test. Three of the tests are nearly round in 

 section. Examples moderately compressed, with orifice of the 

 same character, I have placed with L. marginata. Locality : 

 Nos. 5, 15. 



[Mr. Henry Sidebottom has decided to make a type -slide of the 

 species described in his two papers as an index to the collection 

 of Lagenae. The collection will then be presented to the British 

 Museum (Natural; History), South Kensington, under the title, 

 <l The Thornhill Collection of Lagenae (South-West Pacific)." 



