LOWER LIAS OF ROBIN HOOD'S BAY 



119 



Suborder AMMONITINA Zittel, 1884 



Superfamily PSILOCERATACEAE Hyatt, 1867 



Family PSILOCERATIDAE Hyatt, 1867 



Blocks of limestone containing Psiloceras, Caloceras and other 

 Hettangian and Lower Sinemurian ammonites are sometimes found 

 loose in Robin Hood's Bay, and species have been described by 

 several authors as coming from 'Robin Hood's Bay'. They are not 

 from the inter-tidal exposures (the lowest of which is in the upper 

 part of the Semicostatum Zone), but are derived from Glacial Drift 

 nodules that are widespread in the bay and were exploited by 19th 

 century collectors. 



Genus PSILOCERAS Hyatt, 1867 



Psiloceras erugatum (Phillips, 1829) 



1829 



1962 



Ammonites erugatus Phillips: 163, pi. 13, fig. 13; also 

 Phillips, 1835: 135, pi. 13, fig. 13; and Phillips, 1875:270, 

 pi. 13, fig. 13. 



Psiloceras erugatum (Phillips); Howarth: 99, pi. 14, fig. 2 

 (holotype, BM 37982, from 'Robin Hood's Bay'). 



Psiloceras aff. sampsoni (Portlock, 1843) 



1879/81 Aegoceras planorbis (J. Sowerby); Wright: 308 (1881), pi. 

 14, figs 1,2 (1879) (SMJ18216, from 'Robin Hood's Bay'). 



Genus CALOCERAS Hyatt, 1870 



Caloceras belcheri (Simpson, 1843) 



1843 Ammonites belcheri Simpson: 12. 



1910 Caloceras belcheri (Simpson); Buckman: pi. 17 (holotype, 



WM 101, from Robin Hood's Bay). 

 1879/81 Aegoceras belcheri (Simpson); Wright: 313 (1881), pi. 15, 



figs 7, 8 (1879) (SMJ18217, from Robin Hood's Bay), 9. 

 1976 Psiloceras (Caloceras) johnstoni (J. de C. Sowerby); 



Schlegelmilch, 1976: 106, pi. 5, fig. 8 (WM 101). 



Caloceras convolutum (Simpson, 1855) 



1855 Ammonites convolutus Simpson: 43 (non Ammonites 



convolutus Schlotheim, 1820). 

 1910 Caloceras convolutum (Simpson); Buckman 



(holotype, WM 491, from Robin Hood's Bay). 



Caloceras wrighti Spath, 1924 



1880/81 Aegoceras belcheri (Simpson); Wright: 313 (1881), pi. 19, 

 figs 1,2(1880) (holotype, from North Cheek, Robin Hood's 

 Bay, ?lost). 



1924 Caloceras wrighti Spath: 191 (nom. nov. for Wright's fig- 

 ured specimen). 



Family SCHLOTHEIMIDAE Spath, 1923 

 Genus SCHLOTHEIMIA Bayle, 1878 



Schlotheimia redcarensis (Young & Bird, 1822) 



1822 



1925 



Ammonites redcarensis Young & Bird: 248, pi. 14, fig. 13; 

 also Young & Bird, 1828: 258, pi. 14, fig. 10. 

 Schlotheimia redcarensis (Young & Bird); Buckman, pi. 

 608 (neotype, WM 314; if from Robin Hood's Bay, as 

 labelled, it must be from Glacial Drift). 



Genus SAXOCERAS Lange, 1924 



Saxoceras aequale (Simpson, 1855) 



1855 Ammonites aequalis (Simpson): 49. 



1925a Saxoceras aequale (Simpson); Spath: 204, fig. 4 (drawing 

 of holotype, BM 18109). 



1962 Saxoceras aequalis Howarth: 100, pi. 14, fig. 3 (holotype, 

 BM 1 8 109, from Robin Hood's Bay or Redcar, more prob- 

 ably the latter). 



Genus ANGULATICERAS QuemtedU 1883 



Angulaticeras sulcatum (Simpson, 1843) 



1843 Ammonites sulcatus Simpson: 55 (non Ammonites sulcata 



Lamarck, 1822). 

 1911 Schlotheimia sulcata (Simpson); Buckman: pi. 38 (holotype, 



WM 743; ?from beds 461^164). 

 1976 Angulaticeras sulcatum (Simpson); Schlegelmilch: 1 12, pi. 



8, fig. 7 (WM 743). 



RANGE. Six small examples of Angulaticeras sp. indet. were found 

 in beds 461^-64.33 and 485.2, Denotatus to Oxynotum Subzones. 



Genus Macrogrammites Buckman, 1928 



Macrogrammites antiquatum (Simpson, 1855) 



1855 Ammonites antiquatus Simpson: 36. 



1927 Schlotheimia antiquata (Simpson); Buckman, 1927, pis 

 718A, B (holotype, WM 79/80); if this holotype is a large 

 smooth outer whorl of the Hettangian genus 

 Macrogrammites as identified by Buckman (1928: on cap- 

 tion to pi. 7 1 8A* [re-issue of 1 927, pi. 7 1 8 A]), then it comes 

 from Glacial Drift in Robin Hood's Bay, or from Redcar; it 

 is not from beds exposed in Robin Hood's Bay. 



Family ARIETITIDAE Hyatt, 1875 



Subfamily ARIETITINAE Hyatt, 1875 



Genus CORONICERAS Hyatt, 1867 



Subgenus ARIETITES Waagen, 1869 



pi. 18 Coroniceras (Arietites) alcinoe (Reynes, 1879) 



PL 1, fig. 8 



1879 Ammonites alcinoe Reynes: pi. 23, figs 7, 8, 9-1 1 (neotype, 



from France). 

 1955 Pararnioceras alcinoe (Reynes); Donovan: 14. 



Range. Beds 424.3^429.64, Sauzeanum Subzone; 5 specimens. 



Coroniceras (Arietites) validanfractum (Simpson, 1855) 



1855 Ammonites validanfractus Simpson: 95. 



1962 Coroniceras validanfractum Howarth: 101, pi. 14, figs 4 

 (holotype, WM 282), 5 (paratype, WM 530); similarly 

 preserved specimens have been found at Redcar, but not at 

 Robin Hood's Bay; this species is close to C. (A.) alcinoe 

 (Reynes). 



Coroniceras (Arietites) obesulus (Blake, 1876) 



1876 Arietites obesulus Blake: 284, pi. 5, fig. 2 (lectotype, SM 

 J34800, from Robin Hood's Bay); also very similar to C. 

 (A.) alcinoe (Reynes). 



