38 TYPE AMMONITES— III Mar. 



P. arciruga, Teisseyre, iv, 5 ; v, 5c, d ; Holotype ; Filipowice, Poland. 

 Distinguished by the large number of fine ribs and by their crossing a 

 rather full venter without break ; F. 47-5, 36, 24, 38 ; 32 ribs ; Li at 

 i2"5 mm. est., 27 per cent. A similar smaller specimen, G.S.E., ex 

 Hudleston Coll., No. 30777 ; Gristhorpe, Scarborough, Yorkshire ; 

 Kell. R. ; S. 26, 34'5, 29, 42 ; full size of specimen c. 30 mm., with 

 27 ribs, mostly trifurcate, passing over venter. 



P. oidaleus, nov. Inner whorls, so far as can be seen, like 

 P. arciruga, Teiss., iv, 5, but umbilicus narrower. Outer whorls more 

 of pattern of P. siibcuneatus, Teiss., iv, 12, but ribs smaller and more 

 numerous, venter broadly rounded, crossed by ribs, especially in young ; 

 bodv ch. inflated, rather more than half-whorl, complete with lateral 

 lappet and indication of short ventral rostrum. Geol. Surv. Engl., 

 26093 ; Holotype ; Kellaways ; S. 71, 35, 29-5, 39-5 ; 25 ribs. No. 26084, 

 a colomorph, this sp. ? ; shows signs of swelling, has a rounded venter 

 crossed by ribs, Chippenham ; S. 47, 40, 27-5, 32 ; Li at 18, 28 per cent. 

 No. 26102, similar, Kellaways ; all Kell. R. (f). 



E. Phaulomorphs. Whorls subparallel, venter subtabulate, 1. 

 Stout. 



P. stiphrus, nov. Am. koenigi, J. Sow. cclxiii, 2 ? (F. 39, 

 36, 34 ? 37 ; 19 ribs) . Stout and crassicostate ; ribs about radial, heavy, 

 mostly trifurcate, an occasional one intercalate, crossing rounded, 

 later flattish venter with very faintest forward bend ; umbilicus rather 

 small, concentric. Geol. Surv. Engl. 26088 ; Kellaways ; Kell. R. (e) ; 

 Holotype, with beginning of body-ch. ; S 41, 37, 34, 34; 16 ribs; Li 

 rather long and narrow ; at 13 mm., 26 per cent. ; No. 26086, Id. ; septate; 

 S. 36'5. 39. 36. 34"5 ; 17 ribs. 



E. 2. Somewhat stout. 



P. petrosus, nov. Primary ribs 19, bifurcate, usually also an 

 interpolated secondary ; ribs run radial to cross periphery with a little 

 weakening and very feeble forward turn. S.l. very degenerate, almost 

 ceratitic ; Li at 9 mm., c. 22 per cent. Like Proplanulites haugi, Parona 

 & Bonarelli (T. 50, 35, 25, 40), but whorl almost quadrate in shape 

 while ribs are straight on side and not distinctlv bow-shaped on venter. 

 General likeness to Perisph. ompkalodcs, Waagen (see p. 42), but that 

 has different run of coarser ribs, no intercalated ribs, and the ribs pass 

 strong over venter. Geol. Surv. Engl., 26091 ; Kellaways ; Kell. R. (e) ; 

 Holotype ; S. 39-5 , 33, 33, 43 ; 19 ribs ; size of specimen, 43 mm. ; about 

 I whorl body-ch., nearly complete. 



P. lyprus, nov. Cf. Am. koenigi, J. Sow., cclxiii, i. Like 

 P. petrosus, but thinner ; ribs cross periphery with slight weakness, 

 except just before mouth, where they are strong ; they have usually no 

 bend forward on periphery, only towards last part of body-ch. is there 

 a slight indication of it. Body-ch. i whorl ; lateral auricle, c. 8 mm. 

 long + ?, 3 mm. broad. Geol. Surv. Engl., 26080 ; Holotype ; Kellaways; 

 Kell. R. (e) ; S. 37, 34, 28-5, 41 ; 21 ribs ; No. 26103, Id. ; S. 32, 36, 30, 

 39 ; 23 ribs ; signs of constrictions ; on cast, at beginning of body-ch., 

 peripheral interruption strong, almost Parkinsonian (Cosmoceratan). 



E. 3. Somewhat thin. 



P. tridens, nov. P. teisseyrei ; Douville 1908 (vm, 2, 4 ; 

 Argences, Normandy ; F. 33, 35, 31, 39-5 ; 23 ribs). Whorls not so 

 stout and ornament less marked than in P. petrosus, ribs about radial, 

 3 secondaries to a primary, though one is not always joined up. Geol. 

 Surv. Engl., 26090 ; Holotype ; Kellaways ; Kell. R. (d) ; S. 39-5, 33, 

 30-5, 40 - 5 ; 22 ribs ; about £ whorl body-ch. (incomplete). 



