SUPPLEMENT.— HAUGIA. xxiii 



b. The rursiradiate group. 

 2. Haugia aff. variabilis. Plate XXV, fig. 2. 



? 1S44. Ammonites variabilis, d'Orbigng, PI. cxiii, figs. 3, 4. 

 1878. Hammatoceras Ogerieni, Bayle, PL lxxxii, fig. 2. 

 1890. Haugia variabilis, This Mouograph, PI. xxv, fig. 2, p. 146 (pars). 



The form depicted in these figures seems to differ from variabilis chiefly in 

 being rursicostate. This character is shown in d'Orbigny's young specimen 

 (PI. cxiii, figs. 3, 4). How much and how long it was a character of variabilis, 

 if it was a character at all, is somewhat difficult to determine from d'Orbigny's 

 reduced figure of his large specimen. 



Locality and Stratum. — North Nibley (Cotteswold Sands). 



Date of Existence. — Variabilis hemera. 



3. Haugia sp. 



1882. Harpoceras variabile, Wright, PI. lxvii, figs. 1, 2. 



This is less umbilicate than d'Orbigny's figure of variabilis. It also seems to 

 be rursicostate. 



Locality and Stratum. — Dorset : " sands between Lias and Inferior Oolite, near 

 Bridport," Wright, p. 448. I have some doubts with regard to the locality and 

 the horizon, as they do not agree with my experience. 



c. The variabilis-gronp. 



4. Haugia variabilis (d'Orbigny). Plate A, fig. 34, p. 146 (pars). 



1844. Ammonites variabilis, d'Orbigny, PI. cxiii, figs. 1, 2 only. 

 1853. — — Chapuis et Dewalque, PI. ix, fig. 2. 



? 1882. Harpoceras variabile, Wright, PI. lxvii, figs. 5, 6. 



1890. Haugia variabilis, This Monogr,, PL A, fig. 34, p. 140 (pars). 



The shell depicted by Dr. Wright seems to represent d'Orbigny's species ; 

 but there are some slight errors in regard to the drawing, 1 and the reduction in 

 d'Orbigny's figure makes determination somewhat difficult. 



1 See p. 146, foot-note. 



