SUPPLEMENT.— HILDOCERAS. civ 



Distinction. — From Pseudogrammoceras — the tuberculate ornament ; from Phyma- 

 toceras — the longer projection of the radial line on the periphery. From genera of 

 similar appearance which possess the tuberculate ornament — the septicarina. 



1. Phltseogeammoceeas metallaeium (Dumortier). Plate XXXVI, figs. 1, 2. 



1890. Grammoceras metallarium, This Moiiogr., PI. xxxvi, figs. 1, 2. 

 1902. Phlyseogrammoceras metallarium, Emend. Amm. Nom., p. 4. 



Date of Existence. — Dispansi hemera. 



2. Phltseogeammoceeas dispansum (Lycett). Plate A, figs. 41, 42. 



1890. Grammoceras dispansum, This Monogr., PI. A, figs. 41, 42 ; p. 211. 



3. Phltseogeammoceeas Oebignti (8. BucJcman). Plate XXVII, figs. 3 — 6 (figs. 3, 



4, Type) ; Suppl., Fig. 155, p. clxvii. 



1890. Grammoceras Orbignyi, This Monogv., PI. xxvii, figs. 3 — 6; p. 184. 

 1902. Phlyseogrammoceras Orbignyi, Emend. Amm. Nom., p. 4. 



Correction, p. 184. — The small carina is not exactly solid; it is really a 

 degenerate form of a hollow carina. There are traces of the septum in certain 

 cases, though the hollow character is obliterated. 



Remarks. — The interpretation of this species seems to be that it is a latumbilieate 

 descendant of /'. metallarium, but that it does not come through P. dispan- 

 sum. The latumbilication arises from excentric coiling (outcoiling) beginning 

 before any great degree of angustumbilication has been attained. In many cases 

 among Hildoceratidae the incoiling which produced angustumbilication is carried 

 much farther, even to concavumbilication, before outcoiling commences. In P. 

 dispansum angustumbilication (incoiling) is carried farther than in this species. 



The following work contains figures of species belonging to the Gammiradiate 



series : — 



1898. BenecJee, Beitr. Kennt. Jura Deutseh-Lothr. ; Abh. Spez.-Karte Elsass- 

 Lothr.; N.P., Heft I. 



End of Gammiradiate series. 



