42 TYPE AMMONITES— III May, 



1921 



The general aspect is that of Perisphinctes obtusicosta, Waagen, 

 Kutch, (Pal. Ind. 1875), xxxvm, I, but with wider umbilicus, though 

 whorls are quite as stout : ribs not so strong over venter ; s.l. more of 

 ProplamiHles pattern. Geol. Surv. Engl., 25649 ; Kellaways, Wilts ; 

 Kell. R. (e) ; Holotype ; S. 65, 37, 34, 35 ; 141, 37, 34 (31), 35"- 5 ; 18 ribs 

 to 84 mm. diam. ; 20 to 141 diam. ; max. c. 250 + ; Li at 33 mm., 

 47 per cent. ; at 45 mm., 45 per cent. (PI. CCXXVIII). 



C. crassiruga, nov. "Ammonites bakeries (91ns. diam.);" 

 H. B. Woodward (Mid. Ool. Engl. ; Mem. Geol. Surv., V, 1895, p. 30). 

 Like C. crassicosta, but with broader, thinner whorls and smaller, more 

 excentric umbilicus ; ornament not so heavy as regards primaries ; 

 but secondaries about the same size, though rather more distant ; tends 

 to develop a smooth area between primaries and secondaries, and the 

 latter fade into venter to produce the smooth band. Loss of ornament 

 commences about 230 mm. Geol. Surv. Engl., 4744 ; N. of turning to 

 King's Mead Mill, S.W. of Little Somerford (Somerford Parva), near 

 Malmesbury, Wilts (H.B.W.) ; Kell. R. (e), " calcareous sandstone " ; 

 S. 141, 39, 27 (25), 33 ; 22 ribs ; 238, 36, 28, 3b ; c. 23 ribs ; size of 

 specimen c. 250, with about \ whorl body-ch. ; max. c. 435 ; Li at 55, 

 42 per cent., at 78, 40 per cent. There are marks of whorl-continuation 

 up to about a diameter of 400 mm., with umbilicus then c. 39 per cent. 



C. lahuseni, nov. Perisphinctes koenigii; Lahusen, (Jur. 

 Rjasan ; Mem. Com. Geol. I, 1883) PI. ix, f. 2, Holotype ; f. 1 a, b, c, 

 Paratype. The s.l. which Lahusen depicts, the dimensions which he 

 gives (p. 63) and the description (p. 94) certainly seem to fit Crassi- 

 planulites — a species the next step onward from C. crassiruga. The 

 smaller specimen (illustrated) appears to be its immature stage : it 

 shows a smooth band on lat. area ; Swistowo, (Rjasan), Russia ; Holo- 

 type ; T. 350, 33, 23, 43 ; Li at 72 mm. est., 37-5 per cent. ; Paratype, 

 T. 98, 37-5, 28-5, F. 34 ? ; Li at 32 mm. est., 43 per cent. 



Obttjsicostites, g. n. Genoholotype, Perisph. obtusicosta, 

 Waagen, Kutch (Pal. Ind.), 1875, xxxvm, I. Strong ribs run straight 

 over obtuse periphery ; [s.l. complicated, Li with a broadened (palmate) 

 ending, c. 50 per cent.]. Callovian, " anceps zone," India. 



A. Nomomorphs. 0. paramorphus, Waagen sp., Kutch, xlvi, i, 

 lectotype ; xlvi, 2 ; xlvii, 3, s.l. ; Li at 53 mm. est., 56 per cent. ; 

 0. obtusicosta, Waag. sp., xxxvm, 1, lectotype and genotype ; xxxvm, 2, 

 s.l. ; Li at 49 mm. est., 51 per cent. ; xxxvm, 3. 



B. Phaulomorphs. O. omphalodes, Waag. sp., XXXVII, 2, with 

 lateral auricle ; 0. dhosaensis, Waag. sp., xxxvm, 4, with lateral auricle ; 

 Li at 115 mm. est., 53 per cent. 



Kinkeliniceras, g.n. Genoholotype, Proplanulites kinkclini, 

 Dacque, (Jura von Ostafrika ; Beitr. Pal. Geol. 6st.-Ung., 1910, XXIII, 

 p. 36), PI. v, f. 1 ; vi, 3. Primary ribs not so swollen as in Proplanulites, 

 and thus less difference in size between primaries and secondaries, while 

 the latter tend to run on to the inner area in between the primaries. 

 They also pass fairly strongly over venter, with a very feeble forward 

 curve, but without median loss of strength. [S.l. (p. 37, fig. 17) of 

 pattern of Proplanulites majesticus, (PI. CCXXVI), but Li not so 

 palmate. Li, at 27-5 mm. est., 43-5 per cent.]. 



Callovian, [c. Crassiplanulitcs horizon ?], East Africa ; India, teste 

 Dacque ; possibly England. 



A. Nomomorphs. K. kinkclini, Dacque sp., v, 1, vi, 3, Lectotype ; 

 vi, 1, 2. 



K. ? sp. Dacque cites Perisphinctes spirorbis ; Waagen, Kutch, 



