rOEAMINIEEEA OF THE KEEIMBA AECHIPELAGO. 685 



330. Spirillina limbata, var. denticulata Brady. 



Spirillinalimbata, var. denticulata Brady, 1884, FC. p. 633, pi. Ixxxv. fig. 17. 

 „ „ Efi;ger, 1893, FG. p. 396, pi. xviii. fig. 66. 



„ „ „ Millett, 1898, etc., FM. 1903, p. 694. 



Heron-Allen & Earland, 1913, CI. p. 109, pi. ix. fig. 10. 



7 Stations. 



Scantily distributed over the area, but good and typical specimens at many Stns., 

 especially Stns. 1 and 2 a. 



331. Spirillina margaritifera Williamson. 



Spirillina margaritifera Williamson, 1858, RFGB. p. 93, pi. vii. fig. 204. 

 J. Wright, 1885-6, BLP. p. 321, pi. xxvi. fig. 12. 

 „ „ Heron- Allen Ss Earland, 1908, etc., SB. 1909, p. 440. 



3 Stations. 



Occurs at very few Stns., but it is not uncommon where it occurs. The best and 

 largest specimens were at Stn. 11. At Stu. 1, where it was more frequent, the 

 individuals were small. 



332. Spirillina decorata Brady. 



Spirillina decorata Brady, 1884, FC. p. 633, pi. Ixxxv. figs. 22-25. 

 „ „ Fgger, 1893, FG. p. 394, pi. xviii. figs. 64, 65. 



Millett, 1898, etc., FM. 1903, p. 695. 

 . „ Sidebottom, 1904, etc., RFD. 1908, p. 8, pi. ii. fig. 6. 

 „ „ Chapman, 1909, SNZ. p. 353. 



1 Station. 



One specimen at Stn. 11. Egger's specimens were from West Africa, Mauritius, 

 and Australia. 



333. Spirillina semidecorata, sp. n. (PL LI. figs. 26-31.) 



2 Stations. 



Test free, plano-convex, consisting of a tube acutely angular in section convoluted 

 at an angle towards the centre of the shell. Convolutions numerous, probably not less 

 than five or six, each convolution embracing its predecessors to a greater or less extent, 

 so that, as a rule, little or nothing except the last whorl is visible on the superior 

 surface. The central portion of the shell on the superior face is excavate in a greater 

 or less degree according to the angle at which the tube is inclined in its convolution ; 

 thus in some specimens the final convolution entirely encloses the superior face of 

 the shell except for a minute central crater, in others the superior edge of the tube, 

 in each of the early convolutions, is visible in the central depression. The tirbe is 

 apparently plicate, giving a very characteristic appearance to the upper surface, 

 but this appearance may possibly be due to constrictions inside the tube. Peripheral 



