POEAMINIFEEA OF THE EERIMBA ARCHIPELAGO. 



599 



descendant of the " Cornu Hammonis " called Xautilvs semilituus by Plancus. This 

 latter, which made its first appearance in Plancus' Appendix to the ' Phytobasanos 

 of Fabio Colonna * in 1794 (text-fig. 44, N), appears again in the second edition of 



Text-figure 44. 



K. Nautilus rectus Spengler, 1781, fig. 10 e. 



L. Spirolina cylindracea Blainville, ]82o, pi. v. fig. 1. 



M. „ „ d'Orbigny, 1826, Modele no. 24. 



N. Nautilus semilituus Plancus, 1744, pi. 38. fig. D. 



0. Spirolina clavata Lamarck, _;?f?« Crouch, 1827, pi. ss. fig. 8. 



P. Spirolina austriaca Eeuss, 1861-65, Model no. 25. 



'De Conchis minus notis ' in 1760 f, and again in Martini's and Chemnitz's great 

 work X in 1769 §. 



* ' C. Fabii ColumnBe Lyncei 4>YT0BASAN0S cui accessit Vita Fabii, etc.,' Jano Planco Auctore (Florence. 

 1744), Appendix, p. ii, § 2, pi. sxxviii. fig. D. 



t Janus Plancus, 'De conchis minus notis' (Rome, 1760), Appendix II. cap. 1, pi. i. fig. x (o). 



t F. H. Martini and J. H. Chemnitz, ' Neues system atisches Conchylien Cabinet ' (Nuremberg, 1769-1788), 

 10 vols. Text, vol. 1, p. 265 ; Plates, pi. xx. fig. 186. 



§ The distinction was clear to Spengler, who figures this stout form also in his plate 1, fig 4, and to 

 Schroter, who figures a typical specimen in his ' Neue Literatur und Beytrage zur Kenntniss der Natur- 

 geschiehte, etc' (Leipzig, 1784), on pi. i. fig. 7. 



VOL. XX. — PART XVII. No. 8. — November, 1915. 4 Q 



