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



Lagena Orbignyana Seguenza sp. (PI. 17, figs. 9-11). 



Entosolenia mdrginata (pars) Williamson, 1858, p. 10, pi. 1, figs. 



19, 20. 

 Fissurina Orbignyana Seguenza, 1862, p. 66, pi. 2, figs. 25, 26. 



This occurs in many forms. Some of the specimens are similar 

 to the Challenger Report, pi. 59, figs. 25, 26. Numerous small 

 varieties also are present. In some the side keels are little more 

 than slightly raised ridges. 



PI. 17, fig. 9. This is a very neat and compact variety. 



The test is moderately compressed. Locality : Nos. 42-44 ; 

 frequent at Nos. 42, 44. 



PI. 17, fig. 10. I take this to.be a variety of L. Orbignyana, in 

 which the central keel has split soon after leaving the orifice. 

 The body of the test is much compressed, and is roughened. The 

 entosolenian tube is long and attached. The split keel is entirely 

 blocked w T ith debris, or shell-growth. Two examples found. 

 Locality : No. 38. 



PI. 17, fig. 11. A neat form. The central keel is emarginate 

 at the base, at the middle of which one or two small spines 

 project. The two subsidiary keels are not generally continuous. 

 There are over one hundred specimens. Locality : Nos. 1, 2, 4-13, 

 21, 23, 26, 29, 33, 34, 38, 39. 



Lagena Orbignyana Seguenza sp. var. lacunata Burrows and 



Holland (PI. 17, fig. 12). 



Lagena lacunata (Burrows and Holland) Jones, 1895, p. 205, pi. 7, 

 fitf 12 



One set agrees exactly with fig. 1, pi. 60 of the Challenger 

 Report, which Messrs. Burrows and Holland point out in the 

 above reference, is misnamed as L. castrensis Sch wager. Locality : 

 Nos. 42-44 ; frequent at No. 44. 



A few small examples are occasionally met with in which the 

 pittings are numerous and minute, and the keels very feebly 

 developed. Locality : Uncertain. 



PI. 17, fig. 12. I am treating this as a form of X. Orbignyana 

 var. lacunata, but it appears to have one of the characteristics of 

 L. annectens (Burrows and Holland) Jones, 1895, for the band 

 round the body of the test appears to be very slightly concave. 



