1920 EBRAYICERAS 23 



auriculatc ; S.L.— lobes narrow ; E.S. wide ; L* about half-length of L 1 

 Vesulian (Eningenian) zigzag hemera, France (N. &S.), England 

 (Dorset, Somerset). 



E. ocellatum, nov. PI. CLXXIII. Thinner and more um- 

 bilicate than E. pseudo-anceps, Ebray sp. : it is also less excentrum- 

 bilicate— the umbilicus in youth being wider. The example figured 

 shows the mouth considerably closed up, but with ocular and brachial 

 apertures open: the same as is depicted by H. Douville for 

 Morphoceras pseudo-anceps. 



This example also shows (Fig. la) a great abbreviation of the 

 last air-chamber— marked in black between the two last septa. 



E. pseudo-anceps, Ebray, sp., (1864, Etudes geol. Dep. la Nievre, 

 p. 263 ; H. Douville, " Am. pseudo-anceps " ; Bull. Soc. Geol. Fr. (3) 

 VIII, (1880), 239 ; fig. 2, p. 240.) The example now figured (PI. CLXXIV) 

 is smaller than Ebray 's type as depicted by Douville, but agrees in 

 proportions with his figure at the same diameter. Douville's text, 

 however, differs from the proportions of the figure. His diameter 

 (p. 241) is T. 38, F. 36.5. The diameter is presumably over the shell 

 with mouth, and then it agrees with figure. His breadth of whorl is 

 T. 12 mm., F. 14.5, thickness T 10.5, F. 11. umbilicus T. 13 mm., 

 corresponding to his " maximum radius of umbilicus " 8 mm., F. 12.5. 

 These figures translated to a diam. 36.5 do not agree with the figure, 

 and the breadth of 12 mm. seems too small, because breadth + um- 

 bilicus = 69 per cent, when they should be nearer 72 per cent. The 

 breadth of whorl at end of fig. is, however, presumably exaggerated. 

 For proportions, see below (p. 24). 



In the specimen now depicted ocular and brachial apertures are 

 closed up — the animal has moved forwards ; it will be noticed that the 

 length of body-chamber to end of mouth is the same as to beginning 

 in E. ocellatum. The closing up seems, from growth-lines, to have been 

 done by the mantle working backwards, closing the hinder parts of the 

 apertures last. There is reason to think that tubercles and parabolic 

 excrescences have, in certain cases, been formed in the same way— 

 not by the forward edge of the mantle, but by portions further back, 

 extruding as if repairing an accidental break. The hinder part of closed 

 brachial' aperture is in shape just like a preceding primary rib. 



At the end of the lateral part of mouth of Fig. 2« is a laterally- 

 protruding excrescence which may be some attached foreign body : 

 it is not on the other side (Fig. la). 



E. vaschaldi, Reynes sp. in Collot, Descr. geol. . . d Aix, 1880, 27 

 (Douville, 240). Professor Repelin, Director of Marseilles Museum, has. 

 kindly sent me casts of Reynes types, for which I express my best thanks. 

 The holotype shows a species much larger than the others : it has much 

 finer (hair-like) ribs, more closely set. Esparron, Bouches du Rhone. 



E. jactatum, nov. Fine-ribbed like E. vaschaldi, but with ribs 

 conspicuously thrown forward instead of radial. Involute and con- 

 centrically coiled in early stage, excentrumbilicate last half-whorl. 

 Constrictions more marked than in other species. Burton Bradstock, 

 Dorset [zigzag], S.B. Coll. No. 3316, Holotype. 



E. rursum, nov. A widely-umbilicate form, concentrically coiled, 

 because the wide umbilicus begins early. Ribs coarser than in 

 E. ocellatum, and generally in threes, mostly reclined, making an angle 

 with the lateral nodes. Mouth present, imperfect, a large ocular 



