SUPPLEMENT.— CANAVARINA. cxli 



6. Walkeria? stjbglajbra, 8. Buckman. Plate XIII, figs. 7, 8 (type) ; Figs. 9, LO?; 



Figs. 125, 126, p. clxvii. 

 1888. Lioceras opalinum, This Monogr., PL xiii, figs. 7 — 10, p. 35 (pars). 

 1902. Walkeria subglabra, Emend. Amm. Norn., p. 5. 



Description. — Striate ; gradumbilicate ; periphery fastigate, subcarinate. 

 Remarks. — The generic position is not satisfactory. A specimen of an allied 

 species from North Nibley, in my Collection, shows the same much projected radial 

 line which is distinctive of this species but indicative of disagreement with 

 Walkeria. It also shows in its umbilicus coarse, distant costae, suddenly passing 

 to strige. The characters seem to indicate another genetic series. 



LVIII. Genus — Canavarina, 1 S. Buckman. 



(Type : Canavarina digna, sp. n.) 

 1902. Canavaria, Emend. Amm. Nom., p. 3. 



Definition. — Subplaty-subleptogyral ; subangustumbilicate ; subpauciseptate ; 

 subbrevi-subangustilobate ; laterally flexiradiate, peripherally anguliradiate, con- 

 vexitabulate, subcrassicarinate. (Radial line, fig. 127, p. clxvii.) 



Distinction. — From preceding allied genera, which it resembles in ornament, 

 the convexitabulate periphery and somewhat stout carina. From the genus which 

 it resembles in these characters — Grammoceras, e.g. G. aiulax, toarciense — the 

 difference in mode of ribbing and the smaller umbilicus. 



Remarks. — Since this was penned the name chosen has been used. 



1. Canavarina pollbata (8. Buckman). Plate XXX, figs. 1, 2; Suppl., Fig. 128, 



p. clxvii. 

 1890. GtRammoceras fluitans, This Monogr., PI. xxx, figs. 1, 2 ; p. 190. 

 1902. Canavaria polleata, Emend. Amm. Nom., p. 3. 



Distinction. — From A. fluitans, Dumortier — the costse are smaller and less dis- 

 tinct, particularly in the umbilicus, which is also rather less concentric. The costae 

 also seem to have more lateral curve than in Dumortier' s species. 



Remarks. — Dr. E. Haug wrote as follows (May 22nd, 1890): "Your Gram. 

 fluitans is somewhat different from the specimens of La Verpilliere, which I have 

 identified as such ; they are more compressed." He was referring to the figure in 

 the part of this work then just published. 



2. Canavarina digna, 8. Buckman. Suppl., Fig. 127, p. clxvii, and Fig. 129, p. cxlii. 



1874. Ammonites aalensis, E. Dumortier, Depots Jurass. IV, PI. 1, fig. 3 ; cf. 



? figs. 1, 2. 



1 In compliment to Prof. Mario Canavari. 



