1921 PROPLANULITIDM 39 



P. trifurcatus, nov. Cf. Am. koenigi, J. Sow., cclxiii, 2, but 

 Sowerby seems to show a thicker shell. Cf. P. arciruga, Teiss., iv, 9, 

 but ribs more prorsiradiate and whorls more parallel-sided than that. 

 Ribs 19, mostly trifurcate, periphery rather obtuse, umbilicus fairly 

 concentric. Tutcher Coll., [Kellaways ; Kell. R. (d)] ; Holotype ; S. 48, 

 38, 29, 34 ; max. c. 66 ; Li at 14, 23 per cent. 



P. excentricus, nov. Like the last, but the umbilicus up to the 

 same size is much smaller, then it rapidly widens, becoming decidedly 

 excentric, while primary ribs tend to become heavy. More excentric 

 than any of the D. 1 series, with more obtuse periphery. Body-ch. 

 5/8 whorl, almost complete, and from likeness of terminal part to that 

 of D. 1 series may be expected with auricle. Tutcher Coll. ; [Kellaways ; 

 Kell. R. (d)] ; S. 45, 42, 29, 24-5 ; 71, 38, 26, 35 ; 19 ribs ; Li at 19, 

 18 per cent. A smaller, somewhat more costate example, a polished 

 section, body-ch. 5/8 whorl with sign of lat. auricle, Geol. Surv. Engl. 

 26094, Kellaways ; Kell. R ; S. 62, 37, 26 ? 34 ; 17 ribs. 



A similar specimen, but primaries less strong, G.S.E., ex Hudleston 

 Coll., No. 30779 ; Gristhorpe, Yorks. ; Kell. R. ; S. 63, 35, 28, 35 ; 19 ribs ; 

 Li at 14 mm., 18 per cent. This example has lat. auricles. It is much 

 like P. teisseyrei ; Douville, 1909, vm, 8, 9, except for s.l. P. pourcandi- 

 ensis, Tornquist, 1894, xlvi, 3, given as P. teisseyrei, Tornquist, p. 562 ; 

 Poix-Terron, Mezieres ; Callovian ; F. 92, 38, — , 34; Li at 25 mm.,. 

 22 per cent. : is much like No. 26094, but is larger. 



E. 4 Thin. 



P. parti tus, nov. Cf. P. arciruga, Teiss., iv, 5 ; but ribs stronger 

 and fewer, 22 as against 32 ; cf. P. haugi, Parana & Bonarclli, but lack 

 of forward sweep of ribs on venter ; distinct interruption on cast, 

 beginning body-ch. Primaries, fairly marked, bifurcate, with, usually, 

 one intercalate ; ribs, almost radial, sometimes slightly flexed. Geol. 

 Surv. Engl., 26099 ; Kellaways ; Kell. R. (f) ; S. 41, 34, 26, 40 ; about 

 5/8 whorl body-ch., nearly complete; Li, c. 18 per cent. 



P. rufus, nov. Cf. Am. koenigi Phillips, (Geol. Yorks 1829, 

 vi, 24 ; F. 90 (30), 33, 27 ? 35). Like P. arciruga, Teiss., iv, 5, but fewer 

 ribs and smaller, more excentric umbilicus ; like P. subcuneatus Teiss., 

 iv, 12 (= P. subcuneiformis) , but with ventral part of body-ch. flatter 

 and more swollen. Body-ch. about 5/8 whorl ; at beginning, on cast, 

 shows peripheral interruption as depicted, but somewhat exaggerated, 

 by Phillips. Geol. Surv. Engl., 26104, Scarborough ; Kell. R. (f), 

 ferruginous oolite ; S. 47-5, 37, 21 ? 33 ; 74, 32, 27, 40 ; about 24 ribs ; 

 Li at 18 mm., c. 22 per cent. 



P. fulvus, nov. Somewhat like P. arciruga, Teiss., iv, 5, but 

 with a decidedly excentric umbilicus ; like P. rufus, but with broader 

 whorls and smaller umbilicus. Ribs prorsiradiate, with a slight bend 

 forwards near venter, usually trifurcate, tending later to be bifurcate, 

 with intercalations when primaries increase in size. Venter, up to well on 

 in body-ch., with a distinct narrow, flat area and costal interruption. 

 Geol. Surv. Engl., No. 26097 ; Holotype ; Kellaways ; Kell. R. (f) ; 

 S- 53, 38, 24, 30 ; 74, 35, 24, 38 ; 23 ribs ; body-ch. over \ wh., nearly 

 complete; Li at 19, 20 per cent. ; No. 26083, Chippenham; Kell. R., 

 from top by decomposed condition ; S. 67, 37, 24, 36 ; 21 ribs ; body-ch. 

 c. 5/8 wh., complete on inside area, with indications of lat. auricle — outer 

 part broken. Tutcher Coll. ; [Kellaways, Kell. R.] ; S. 45, 39, 27, 33-5 ; 

 56, 35, 25 ? 36 ; body-ch. about 3/4 whorl, nearly complete ; Li at 13, 

 21 per cent. ; another ex. same Coll. [and Loc] from top K.R. by con- 

 dition ; S. 39, 37, 25-5, 34 ; 53, 34, 24-5 ? 33 ; 24 ribs ; body-ch. just, over 



