734 MESSES. E. HEEON-ALLEN AND A. EAELAKD ON THE 



Folijstomella subnodosa Goes, 1894, ASP. p. 102, pi. xvii. figs. 817-819. 

 Chapman, 1900, PLF. p. 203. 

 " „ Sidebottom, 1904, etc., RFD. 1909, p. 16, pi. v. fig. 6. 



" „ Bagg, 1912, FPC. p. 92, pi. xxviii. fig. 12. 



14 Stations. 



Generally distributed, often fairly abundant. The only marked variation observed 

 is in the extent of development of the secondary umbilical shell-substance, which is 

 much more prominently developed in some individuals than in others. 



454. Polystomella macella (Fichtel & Moll). 



Nautilus macellus Ficlitel & Moll, 1798, TM. p. 66, pi. x. figs. e-g. 

 PolystomeUa macella Parker & Jones, 1859, etc., NF. 1860, p. 104. no. 8. 



Brady, 1884, FC. p. Ti7, pi. ex. figs. 8, 9, 11, & ? 10. 



Eggei', 1893, FG. p. 432, pi. xx. figs. 22, 23. 

 „ Chapman, 1907, RFV. p. 142, pi. x. fig. 9 (var. limhata). 



Heron-Allen k, Earland, 1908, etc., SB. 1909, p. 696, pi. xxi. fig. 3. 



17 Stations. 



Universally distributed and usually abundant, often well developed, but never 

 attaining the large size of the specimens found in many Australian shore-sands. 



Fichtel and Moll's original figure and description represent a shell in which the 

 s*utural lines are depressed or excavate. Chapman has created a variety " limhata " 

 in which the sutural lines are limbate, and the shell-surface near the sutural areas 

 and in the umbilical region is covered with an exogenous shell-growth in the form of 

 small papillae or granulations. It is questionable whether this variation does not 

 exist wherever P. macella occurs. No effort was made by us to discriminate when 

 selecting the Kerimba specimens, but an examination of the type-slides reveals the 

 presence of both forms wherever the species occurs, except at two Stns., where only 

 a single specimen was picked out. This would seem to point to the fact that the two 

 forms are normally concomitant. 



455. Polystomeila craticulata (Fichtel & Moll). 



Nautilus craticulatus Fichtel & Moll, 1798, TM. p. 51, pi. v. figs, h, i, k. 

 PolystomeUa craticulata d'Orbigny, 1826, TMC. p. 284. no. 3. 



Carpenter, Parker, & Jones, 1862, IF. p. 279, pi. xvi. figs. 1, 2. 

 Helicozoa craticulata Mobius, 1880, FM. p. 103. 

 Polystomella craticulata Brady, 1884, FC. p. 739, pi. ex. figs. 16, 17. 



Egger, 1893, FG. p. 433, pi. xx. figs. 24, 25. 



14 Stations. 



Generally distributed and often common, but does not attain any very large size 

 except at Stns. 3, 5, 6, and 9. At Stns. 8 and 10 the specimens were all very small. 



