324 ME. s. s. BUCKMA^" OX [vol. Ixxiii,.' 



Figs. 2 & 3. GiEViCERAS GLF.VEysE, nom. nov., p. 289. 



Fig. 2. Sectional yiew of holotype, X 0*5. See PI. XXVIII, figs. 1 & 2, and 

 p. 294, fig. 5. Fig. 3. Side view of a jDaratype, a young example, 

 X 2 ; ' Middle Lias, raricostatum,' lower part of Folly Lane Brick- 

 yard, Cheltenham (Gloucestershire); Deiran, Gleviceras rj. See 

 PL XXIX, fig. 3, and PL XXX, fig. 4, for other illustrations of 

 same example. 



Plate XXVIII. 



Figs. 1 & 2. Gleviceras glevexse, nom. nov., p. 289. 



Fig. 1. Side view of holotype, X 0*5 ; Middle Lias, ' raricostatum hemera,' 

 lower part of Folly Lane Brickyard, Cheltenham (Gloucestershire) ; 

 Deiran, Gleviceras v. For sectional view see PL XXVII, fig. 2, and 

 see also fig. 5, p. 294. Fig. 2. Side view (part) of paratype taken 

 as genotype ; Lower Lias Shales, Cheltenham, ex J. Buckman Coll. 

 {^ Am. greenhotighii ') [Deiran, leviceras i]]. See also pp. 294-95, 

 figs. 4, 11, 21. 



Fig. 3. MicEODEROcEiiAfi iyELAii'3r, sp. nov., p. 305. 

 Fig. 3. Apertural view, XO-66. See PL XXIX, fig. 1. 



Fig. 4. ARyiocERAS TORirxAirM, sp. nov., p. 301. 

 Fig. 4. Peripheral view, natural size. See PL XXXI, fig. 4. 



Plate XXIX. 



Fig. 1. MiCRODEROCERAS IXEEATUJI, Sp. nOV., p. 305. 



Fig. 1. Side view, X 0*66 ; Lower Lias, Barrow Gurnej (Somerset) [Lymian- 

 Mercian, ^ost-birchi]. See PL XXVIII, fig. 3. 



Figs. 2 a & 2 6. Arietites ti'rgescexs, sp. nov., p. 296. 



Fig. 2 a. Side view ; fig. 2 b, peripheral view showing loss of carina, with long 

 ventral projection and sudden return to a rounded venter with a 

 much shortened rostrum ; both figures X 0*5. Lower Lias, Barrow 

 Gurney (Somerset) [Mercian, post-turuei-i^. See PL XXXI, fig. 5. 



Figs. 3 a-3 c. Gleviceras glevexse, nom. nov., p. 289. 



Fig. 3 a. Side view ; fig. 3 b, peripheral view ; both figs. X 1"25 ; fig. 3 c, part 

 of side view showing suture-lines marked in on photograph, x 2. 

 See also PL XXVII, fig. 3, PL XXX, fig. 4, for other illustrations 

 of same specimen ; also PL XXVII, fig. 2 & PL XXVIII, figs. 1-2. 



Plate XXX. 



Figs. 1 a & 1 b, MiCRODEROCERAS DEPREssZ'.v, uom. nov., p. 303. 



Fig. 1 a. Side view ; fig. 1 b, apertural view of holotype ; Lower Lias, Barrow 

 Gurney (Somerset) [Lymian-Mercian, circa birchil ; pres. J. W. 

 D. Marshall. 



Figs. 2 a & 2b. Microderoceras septigeruji, nom. nov., p. 304. 



Fig. 2 a. Side view ; fig. 2 b, apertural view. ' Lower Lias Shales, Cheltenham 

 [District],' Gloucestershire, [Bredon, Worcestershire], [L;5anian- 

 Mercian, -po&t-birchi] ; ex J. Buckman Coll. (' Ammonites birchii '). 



