﻿DUMORTIERIA MOOREI. 255 



Branco's Harpoceras pseudoradiosum, in his pi. ii, fig. 2, exhibits exactly the 

 characters of ribbing described by Haug, and it agrees in all other respects. 

 As the name pseudoradiosum is restricted to his fig. 1, Haug's name can apply 

 to the present form. 



Dumortieria radiosa var. gundershofensis, is a very rare form, only the two 

 figured specimens being known to me. PI. XXX, fig. 18, gives the side view of a 

 small specimen from the Opalinum-zone (Moorei-beds) of CoaleyPeak, Gloucester- 

 shire. PI. XLV, figs. 13, 14, furnish two views of a specimen from the Yeovil 

 Sands. Its locality is not recorded, but in all probability it came from Bradford 

 Abbas, Dorset. 



Dumortieria Moorei (Lycett). Plate XXX, figs. 15—1 7,19; Plate XLIV, figs. 4—9. 



1851. Ammonites opalinus, Boyle et Coquand (non ReinecTce). Toss. sec. Chili; 



Mem. de la Soc. Geologique de 

 France, 2e aerie, vol. iv, pt. i, 

 pi. ii, fig. 1. 

 1857. — Moorei, Lycett. Cotteswold Hills, pi. i, fig. la (not 2b). 



1879. Hakpocebas mactra, Branco (non Dumortier) . TJnt. Dogger; Abh. geol. 



Spez.-Karte Elsass-Lothriugen, pi. i, fig. 10. 

 1881. — Mooeei, S. Buchman. Inf. Ool. Amm. ; Quart. Journ. Geol. 



Soc, vol. xxxvii, p. 605 (pars). 

 1881. — Aalense, Wright (won Ziete?i). Lias Amm.; Pal. Soc, pi. lxxx, 



figs. 1, 2 only (not 3, nor 5). 1 

 1885. Ammonites steiatulo-costatus, Quenstedt. Amm. Schwabischen Jura, pi. 



lii, fig. 10 only (not 7,8,9), 

 p. 413. 



Discoidal, compressed, carinate. Whorls broad, much flattened, ornamented 

 with direct, ventrally-inclined strias. Ventral area acute, furnished with a small 

 inconspicuous carina. Inner margin smooth, distinct, flattened. Inclusion about 

 one-third. Umbilicus flat, with coarse ribs in the centre. Termination a sub- 

 arcuate bend with a bluntly-pointed ventral process. 



Lycett's original specimen of this species is contained in the Museum Pract. 

 Geol., marked VI- 4 -g. It resembles his figure in almost every particular, except 

 that it is nearly twice as large. It possesses the mouth-border as given on the plate, 

 but the ventral portion is more curved forwards. The suture-line shown in his 

 fig. 2 b could not have been taken from this specimen ; because only a portion of its 

 suture-line was visible until Mr. Newton removed a piece of test to allow of its 

 complete exposure. (The result is depicted, PI. XLIV, fig. 9.) 



Dr. Wright's figure, which is quoted above under the name Harpoceras 

 Aalense, has a marked resemblance to Lycett's original specimen of Ammonites 



1 See ' Geol. Mag.,' dec iii, vol. iii, p. 443, 188G. 



