SUPPLEMENT.— LILLIA-HAUGIA. xi 



2. Less umbilicate. 



Am. jugosus, Sowerby. 



Am. Ogerikni, Dumortier, PI. xix, figs. 3, 4. 



Haugia jugosa (variabilis), This Monogr, PI. xxiii, figs. 11 — 13. 



The following species show a slight amount of flexure in the costation, and 

 this character seems to distinguish them. They may be placed here for 

 convenience, but it is possible that they are more connected with Phymatoceras. 



Am. illustris, Denchmann, PI. vi, fig. 1, (Type). 

 Am. illustkis, DencJcmann, PI. v, fig. 2. 

 Haugia ? comprkssa, sp. n. 



Some of the species of the Eseri-group show flexure too. They are perhaps 

 descendants of different genetic series, possibly of Lillia, possibly of Phymatoceras. 

 But that matter being uncertain they may be placed here to avoid change of name. 



B. Flexiradiate — Phymatoceras, Hyatt. 



A. Tuberculation irregular. 



Am. tirolensis, Dumortier, (Type of genus). 

 Am. comensis, Meneghini, PI. viii, fig. 6. 



B. Tuberculation subregular. 



Am. Escheri, Hauer. 



Am. comensis, Meneghini, PI. viii, fig. 7. 



Haugia Dumortieri, 8. Buchnan. 



G. Tuberculation inconspicuous. 



Am. comensis, Meneghini, PL v. 



Am. comensis, von Buck. 



Am. comensis, Dumortier, PI. xx, figs. 1, 2. 



Am. Werthi, Denclcmann, PL ii, fig. 1. 



Ph. ? pauper, sp. n. 



