POLYSTOMELLA CRISPA. 353 



3. PoLTSTOMBLLA ORisPA (LinnS), 1767. Plate II, figs. 40 — 43. 

 Part I, 1866, Appendices I and II, Tables, No. 95. 



Cornu Hammonis minus vulgare, Orbiculatum, &c., Plancus, 1739. Conch, minus 



notis, Edit. Venet. (and Edit. Romas, 1760), 

 p. 10, pi. i, figs. 2 D, E, F. 

 Nautilus minimus, &c., Gaultieri, 1742. Index Test. Conch., pi. xis, figs. A 



and D. 

 NAUTiLrs CEispus, Linn^, 1758. Syst. Nat., ed. 10, p. 709, No. 235 ; edit. 12, 



p. 1162, No. 275; edit. 13 (Gmelin's), 

 p. 3370, No. 3. 

 Cornu Hammonis, LedermiiUer, 1760. Mikroseopisch. Gemiiths, &c., p. 16, pi. viii, 



fig. h. 

 Nautilus tabulatus, minimus, umbilicatus, marginatus, et granulatus, Martini, 

 1768. N. Syst. Conch.-Cab., p. 250, pi. xx, 

 figs. 172—174. 

 Nautilo, Targioni, 1770. Eelaz. Viaggia, vol. iv, p. 8, pi. i, figs. 6 — 8. 

 Nautile microscopique granuleux, D' Argenville (Favanne), 1780. Conchyliologie, 



vol. i, p. 680, pi. vii, fig. B 1 ; p. 728, pi. Ixix, 

 fig. D 2. 

 NArxiLus CEISPUS, Spengler, 1781. Nye Saml. k. Danske Selsk. Skr., vol. i, 



p. 368 [pi. i], figs, la— c. 

 Nautilus spiralis geuiculis crenatis, Walker and Boys, 1784. Test; Min. Ear., 



p. 18, pi. iii, fig. 65. 

 Nautilus ceispus, Adams, 1787. Essays Microsc, p. 640, pi. xiv, fig. 30. 

 Nautili striati communes (crispi, Linnaei), SoldaTii, 1789. Testaceogr., vol. i, 



part 1, p. 54, pi. xxxiii, fig. E; and pi. xxxiv, 

 figs. G, H (umbonate P. crispie) ; and fig. I 

 (impoverished P. strigWata, between crispa 

 and macella). 

 Hammonia erispa, Soldani, 1789. Ibid., p. 54, pi. xxxiv, fig. co (an explaiiate 



Polystomella, near P. macella). 

 Nautilus ceispus, FicJitel and Moll, 1798. Test. Mierosc, p. 40, pi. iv, figs, d — 



f; and pi. V, figs, a, b. 



— ambiguus,^ F. and M., 1798, p. 62, pi. ix, figs. d—f. 



— CEISPUS, Kanmaclier {Walker and JacoV), 1798. In Adams's Essa} s 



Microsc, 2nd edit., p. 640, pi. xiv, fig. 30. 



— — PuUeney, 1813. Hutchins's Hist. Dorset, 2nd edit,, vol. iii, 



p. 42, pi. xix, fig. 29. 



1 Nautilus ambiguus, E. and M., although possibly a Feneropolis, has the angular row of pertora- 

 tions representing the aperture typical of Polystomella ; and, if it be the latter, P. ambigua (F. and M.) 

 is one of the varieties ranging between striatopunctata and erispa. It is much like P. Listeri, d'Orb., 

 ' Eor. Eoss. Vien.,' pi. vi, figs. 19 — 22. On the same plate d'Orbigny has figured other closely related 

 varieties, as P. Hauerina, figs. 1, 2 ; rugosa, figs. 3, 4 ; obtusa, figs. 5, 6; and Anfonina, figs. 17, 18. 



