June GOLIATHICERAS 17 



1920 



V. quadratum, J. Sowerby, 1813, (M.C. I, 52, xvn, 3) ; T. & F. 37, 

 39. 3° ? 3° ; An example from Cowley, near Oxford, L. Calc. Grit, 

 S.B. Coll. No. 2779 ; S. 96, 36, 27, 32.5. The somewhat polygyral inner 

 whorls of this example match what is shown in Sowerby's figure. They 

 persist longer than one would have expected — cunctative palingenesis ? 



The above species would have much the same maximum diameters 

 — av. c. 100 mm., about same whorl-breadth — c. 36 per cent. The 

 differences are thickness, umbilication and size of ribbing. There should 

 be a species between V. dorsale and V. vertebrate. 



Lamberticeras, p. 14, PI. CLIV, and Prinoceras, PI. CLV : Mr. 

 L. F. Spath, F.G.S., kindly advises that they are pre-occupied. It is 

 necessary to change. 



Bourkelamberticeras instead of Lamberticeras — the species 

 was named after Aylmer Bourke Lambert (J. Sow. Ill, 73). 



Prionodoceras instead of Prionoceras. 



Prionodoceras, g. n. (irpia>», a saw). The serratum group. 

 Genoholotype, P. prionodes n., PL CLV. 



Amblygastric, convergent-sided platycone ; periphery 3 — fastigate, 

 strongly carinate, carina serrate. Tuberculation — (EL) [more pro- 

 nounced after loss of ribs], [(ES), L 1 in costate species]. Very long 

 projection of rad. 1. on periphery. S.L. simple with short, broad lobes 

 [longer in costate spp.], loculi short, septa crowded (degenerate ?). 



Distinguished by swollen stage developed on inner margin, whence 

 whorls slope to narrow periphery ; a substantial serrate keel ; excessive 

 rostration and simple suture-lines packed close (degenerate ?). Swelling 

 scarcely commences till ribs are much in decline. Am. serratus, J. Sow., 

 Am. serratus, Damon (non Sow.) and many other species. Cf. Cardioceras 

 shuravskii, Sokolov (Petschora ; Mem. Comm. Geol. 76, 1912, II, 4-6,) 

 England ; Russia ? In the Midlands and eastern counties of England 

 the species occur in Drift and have been placed in Museums as from 

 Oxford Clay. They occur in Kimmeridge Clay (Damon), lower part — 

 the Upper Oxfordian of Salfeld — for the present to be reckoned as 

 Kimmeridgian, though a distinctive term is perhaps wanted. 



Korythoceras, g. n. (xopvs, helmet). Genoholotype, K. korys 

 nov., described below. 



Galeatiform ; periphery 3 ; ornament 4 ; costal laterally slightly 

 flexed, versiradiate, regularly bifurcate, S'VL 2 , slightly bullate, well- 

 projected on keel ; S.L., ES and L l about equal, L 2 short, lobes broad, 

 saddles narrow. 



A series with characters of V ertumniceras and Goliathiceras. 

 Separable from the first by finer regular ribbing and a distinct keel ; 

 from the second by ribbing, by the more pronounced keel on which 

 ribs form a fairly projected V, by radial line all behind guide-line, by 

 suture-line with short L 2 . It would not attain stoutness of that genus. 

 Scotland ; and Swiss Jura ? 



K. korys, n. (cf. Cardioceras goliathus ; Loriol (non d'Orb.), Oxf. 

 inf. ; Mem. Soc. Pal. Suisse, XXVII, 1900, 30, ill, 7). Galeatiform, 

 with fine, regularly bifurcate ribbing, sweeping well forward over a 

 distinct keel ; involute ; S. 42.5, 47, 52, 24 ; " Loch Staffin, Isle of Skye, 

 Scotland, Oxford Clay " with Peltocerates — P. cf. interscissum Uhlig 

 (Loriol) etc. : [Argovian, post-scarburgense pre-vertebrale Argovian 4] . 

 Mus. Geol. Surv. Engl. Coll. No. 30380 Holotype and Genotype ; No. 

 30381 Paratype. 



Goliathiceras, S. Buckman 1919, T.A., Legend of Pis. CXXXII 

 a — c. The goliathus group. Genoholotype Goliathiceras ammonoides, 

 Young & Bird sp., Plesiotype, PI. CXXXIIc. 



