34 TYPE AMMONITES— III Mar. 



Kellaways Rock, post-koenigi 7, Wiltshire ; " Kelloway Rock," pars, 

 koenigi and post-koenigi, Yorkshire ; Scotland, Sutherland ; Roof Bed, 

 koenigi. Also France (Normandy, Deux Sevres and Ardennes) ; North- 

 West Germany, and Poland. 



A — C. Nomomorphs (and a megalomorph) ; body-ch. i-i£ whorls, 

 not found complete; mouth not known, plain? A. S.l. subelaborate, 

 Li, c. 40 per cent. 1. Venter subcuneate, rounded, smooth. Max. 

 c. 450 + ; usually c. 200. 



P. majesticus, nov. Perisph. kdnighi, Neumayr (Balin, xi, 2), 

 Per. obtusicosta, Petitclerc, non Waagen, (Call. 1915, vn, 3). Large ; 

 22 primary ribs. Well represented in Neumayr's fig., but costation 

 remains strong for about another half-whorl in the holotype. Umbilicus 

 concentric, strongly ribbed ; periphery narrowly rounded, smooth, but 

 ribs may sometimes be followed across it. Approximation of s.l. to 

 the style of Perisph. obtusicosta, Waagen, and the likeness in form, 

 suggest a common origin for Obtusicostites and Proplanulites — Petitclerc 's 

 identification is witness. 



Geol. Surv. Engl. No. 30533, Chippenham, Wilts ; Kell. Clay 

 (a) ; Holotype ; S. 133, 37, 27, 35 ; Li at 47 mm., 42-5 per cent. ; max. 

 c. 210. Neumayr's specimen, also from Chippenham ; F. 127, 35, 27, 



36 ; max. c. 210 ; Petitclerc 's, Deux-Sevres, France ; T. 132, 38, 26-5, 37. 



P. basileus, nov. An involute form with heavy ribs in the 

 umbilicus, cf. Am. kdnighi Neumayr, Balin, xi, 3. Smooth stage 

 begins about 190 mm. diam., 18 ribs in a whorl up to that, 17 ribs up 

 to 95 mm. Geol. Surv. Engl., 30741 ; Chippenham ; Kell. Clay (b), 

 [from a large septarian nodule] ; S. 147, 38-5, 25, 30 ; 236, 37-5, 25-5, 

 35 ; wholly septate ; max. c. 465 + ; Li at 56 mm., 40 per cent., at 

 88, 36 per cent. This is a megalomorph, representing perhaps the acme 

 of size for Proplanulites. 



P. laevigatus, nov. Becoming smooth at about 95 mm. ; about 

 15 ribs whorl before that ; involute, then excentrumbilicate ; Geol. 

 Surv. Engl., ex Darrell, Coll., 30686 ; Holotype ; Rampisham, Dorset ; 

 K. Clay (b) ; S. 83, 44, 26-5, 26 ; 92, 43-5, 25-5, 26 ; 147, 40, 24, 29 ; 

 according to mark on test about ijwh. body-ch. = max. c. 190 ; Li at 



37 mm., 35 per cent. 



•. A. 2. Venter subgibbous. 



P. teisseyrei, Tornquist, 1894, (Preplan. ; Zeit. Deutsch. Geol. Ges., 

 XLVI, p. 562) ; PI. xlv, ia— d ; Holotype ; Callovian ; Pourcandes, 

 Mezieres, (Ardennes), France ; 18 ribs about radial. Li at 28-5 mm., 

 42 per cent. ; F. 90, 39, 27, 33. P. teisseyrei ; R. Douville, 1908, (Ceph. 

 Call. d'Argences ; Mem. Soc. Linn. Norm. XXIII), vm, 8, 9 ; Argences, 

 Normandy ; F. 65, 37, 255, 35 ; Li at 22-5, 42 per cent. : umbilicus is 

 wider at a smaller size, therefore more excentric. 



A. 3. Venter subcuneate, crossed by ribs. 



P. sp. P. arciruga, Teiss., iv, 9 ; v, 9c, (non iv, 5), Czema, Balin, 

 Poland ; F. 42, 40-5, 26, 35 ; 22 ribs ; Li at 12-5 est., 40 per cent. 



Near this is No. 30534, Geol. Surv. Engl., " Christian Malford ? " 

 [Wilts] ; K. Clay (b) ; S. 38-5, 37, 28, 33 ; 23 ribs ; Li at 12-5 mm., 



38 per cent. 



P. ferruginosus, nov. Thinner than P. koenigi (Sow.), with 

 forward bending ribs and more developed s.l. Ribbing less conspicuous 

 than in P. opimits and periphery narrower. Geol. Surv. Engl., 26105 '• 

 Holotype ; Scarborough, Yorks. ; Kell. R. (d), brown ferruginous ; 

 S. 57, 40, 27, 26 ; 21 ribs ; 99. 41, 26, 28-5 ; Li at 24 mm., 33 per cent. ; 

 at 31 mm., 37 per cent. 



