PSEUDOLTOCERAS BEYRICHI. 87 



uncommon and very characteristic." Dr. Haug (p. 352) states that the species 

 occurs at Saint-Romain (Rhone) and Clapier, and that he has seen specimens in 

 Alsace from the Lytoceras-jurense-beds. 



Plate XX, fig. 3, gives a side view of a fine specimen which was obtained from 

 Coaley Wood (Bed 17), with the variety of Hild. bifrons. Fig. 4 exhibits the 

 front view. Fig. 5 represents the side view of a young example, with a large 

 portion of body-chamber present (the cross marks the position of the last suture). 

 The body-chamber shows that the carina is filled by the core, 1 b, while the letter 

 a indicates the carina with the test present. Fig. 6 illustrates the back view of 

 the same specimen, which shows that in youth the species possessed a broader and 

 more distinct ventral area. This specimen came from Bed 28 at North Nibley. 



Pseudolioceeas Beyrichi (Schloenbach), var. Plate XX, figs. 7 — 10 ; Plate A, 



fig. 22. 



1856. ? Ammonites lythensis, Oppel. Juraformation, p. 246 (pars). 



1865. — Beyeichi, Schloenbach. Jurass. Amm. ; Palaeontographica, vol. 



xiii, pi. xxvii, figs. 4, 5. 

 1885. Haepoceeas Beyeichi, Haug. Beitrage Monog. Harp. ; Neues Jabrbueb 



fur Min., &c, Beil.-Bd., iii, p. 623. 

 1887. Ammonites (Haepoceeas) Beyeichi, Denckmann. Fauna Ob. -Lias Dorn- 



ten ; Abh. geol. Specialkarte Preussen 

 und Thiiringiscben Staaten, Bd. viii, 

 Heft 2, p. 67. 



Discoidal, compressed, with small hollow carina ; whorls distinctly convex, 

 ornamented with simple, subfalciform radii, which develop on the outer area into 

 rather obscure but broadish, wave-like ribs, with their ends projected towards the 

 front. The inner area falls away towards the umbilicus, and is thus depressed ; 

 it is smooth, and crossed by fine straight strias. The ventral area passes so 

 gradually into the lateral that it is scarcely defined. The carina is of the hollow 

 type ; it is small, and not very distinct from the ventral area. When the test is 

 absent a very slight trace of carina appears on the ventral area, which is therefore 

 not completely rounded. The inner margin is upright. Quite five sixths of the 

 inner whorl is occluded. The umbilicus is small, not very deep, shows portions of 

 the inner whorls like small steps, and is quite smooth. The aperture is sagittate. 



Our specimens cannot be considered as exactly typical of Schloenbach's species, 

 which shows an aperture rather more gibbous towards the carina, and with its 

 broadest part rather beyond the middle. Our specimens exhibit the broadest part 

 of the aperture at about the middle, and they slope thence towards the carina. 



1 See footnote, p. 81. 



