396 IlEXRY SIDEBOTTOM ON LAGENAE OF THE SOUTH-WEST PACIFICV 



Tlie cells are formed by cross-bars between the costae, which are^ 

 not so high as the costae, and are all filled with exogenous shell- 

 growth. Nearly all the tests show signs of disintegration, and 

 when this has taken place the shell-wall shows transparent, with 

 rows of minute spines arranged in lines, as shown in fig. 23. 

 1 am unable to state whether these spines are tubular. In more 

 than one case the whole of the outward part of the test has gone^ 

 leaving the inner shell bare, except for the spines. 



The superstructure is thick, as can be seen in fig. 23. There 

 are over fifty on the slide. The cross-bars can be detected in a 

 few of the large tests only ; but when a broken test is mounted in 

 Canada balsam, and viewed on the inside, concave surface, by 

 transmitted light, the cross-bars are quite distinct and are 

 arranged in line and not alternately. The tests are opaque 

 and of a pale cream colour. The opaqueness is probably due 

 to age. The question naturally arises is this a true L. foveolata 

 and is all this shell-growth the result of age ? Perhaps 

 L. seriato-granulosa Reuss, 1870, p. ^^'6, No. 16 Schlicht, 1870,. 

 pi. 38, fig. 20, is related to, or identical with, this form. 

 Schlicht's illustration seems to show a change of the surface 

 ornament close to the neck. Is this the beginning of the dis- 

 integration which is so common in my specimens? Schlicht's- 

 figure and its description are not sutiicient for absolute identi- 

 fication. Brady puts this figure under L. striatopunctata in the- 

 Challenger Report. 



Lagena lamellata sp. nov. (PI. 16, tigs. 24, 25). 



This belongs to the class of Lagenae that have their walls 

 compound. There are two large specimens on the slide, one of 

 which is almost in perfect condition. The long neck has the- 

 spiral sculpture, and is normally straight. The colour is a pale- 

 cream. The surface of the test seems to be built up of thin 

 flakes, arranged in an irregular manner, which, although rough,, 

 glisten to a certain extent. Damaged specimens show the com- 

 pound shell-wall to be of extraordinary thickness. The outer,, 

 flaky surface appears to be held up by fine spines (tubular, I 

 think), and the interstices partially filled with exogenous shell- 

 growth. 



The section, fig. 25, of part of a broken example from a 

 Penguin station shows the relative widths of shell-wall and 



