XXXVI 



INFERIOR OOLITE AMMONITES. 



Literature. — Few species of this genus, as it is now restricted, bave been 

 figured. The following may be noticed : 



Comptus, Nautilus, Eeinecke, Maris protog. Naut. et Argon., pi. i, figs. 5, 6. 



Costula, Ammonites, Dumortier, Bassin du Rhone, iv, pi. li, figs. 1, 2. 



Elegans, Ammonites, Vacek, Ool. Cap San Vigilio ; Abb. k. k. Geol. Eeichs., Bd. xii, 



pi. vii, fig. 17. Somewhat doubtful. 

 M-Eanduus, Nautilus, Beinecke, Maris protog. Naut. et Argonautas, pi. i, figs. 3, 4. 

 Opalinus, Ammonites, Quenstedt, Ceph., pi. vii, fig. 10. 



— — — Der Jura, pi. xlv, fig. 10. Somewhat doubtful in radial 



curve. 



— — — Schwiibischen Amm., pi. Iv, fig. 1. Somewhat doubtful. 



— costosus, Ammonites, Quenstedt, ibid., pi. Iv, fig. 20. 

 Opalinum, Haepoceras, Wright, Mouogr. Lias Amm., Pal. Soc, pi. lxxx, fig. 4. 

 Opalinus, Nautilus, Beinecke, Maris protog. Naut. et Argon., figs. 1, 2. 



Correction. — Nearly all the specimens inscribed as Lioceras in the body of this 

 work must be removed from that position. 



Specific Characters. — The species to be described in this genus may be divided 

 by their surface ornamentation into the following groups : 



A. Cost ate. 



B. Subcostate. 



C. Striate. 



D. Benovate. 



uncinatum 



bifidatum 



grave 



comptum 



uncum 



uudulatum 



lineatum 





costosum 



plectile 



opalinum 





subcostosum 



plicatellum 



striatum 





gracile 



partitum 

 Thompsoni 







A. Species in the costate stage. 



1. Lioceeas uncinatom, S. Buchnan. Suppl., Plate V, figs. 7 — 11. 



Cf. ? 1874. Ammonites costula, Dumortier (non Beinecke), pt. 4, pi. li, figs. 1, 2. 



1885. Hildoceeas Mubchison^!, Haug, Beitr. Monogr. Harpoceras ; Neues 



Jahrbuch fiir Mineral., &c, Beil.- 

 Bd. iii, p. 687 (pars ?). 



Description. — Platyleptogyral, gradumbilicate, flexicostate. 



Distinction. — From Ammonites costula, Dumortier, less umbilicate and less 

 distantly costate. From Hildoceras connectens, Haug, less umbilicate, differently 

 ornate ; and, so far as can be judged from the figure, connectens has a more 

 pronounced peripheral projection of the radii. 



Localities and Strata. — Dorset : Burton Bradstock (grey limestone above the 



