354 L. F. Spath—Ammonites from Spitsbergen. 
The two forms of Craspedites are characterized by their compressed 
and almost smooth inner whorls, with a deep and comparatively 
small umbilicus. The outer whorl of the first example agrees very 
well with Nikitin’s fig. 20,1 and is just a little coarser in ornament, 
though not nearly so nodate as fig. 19, which, however, it equals in 
size. The other example resembles in its more sharply defined 
costation (of the outer whorl only) certain forms of Craspedites 
from the Rjasan horizon,? and the Neocomian Tollia, but it is quite 
different from the finely costate Valanginian forms from Northern 
Germany in the British Museum. The inner whorls of the type of 
those of a compressed C. okensis d’Orbigny sp.° show this second 
form to belong to the Purbeckian Craspedites.* 
Some fragments of belemnites, apparently from the Upper Jurassic 
beds of Cape Staratshin, seem to be referable to Puresetrobelus 
magnificus (d’Orbigny) in Pavlow.® 
Ill. Cretaceous. 
The only Ammonite in the collections from Green Harbour, 
a fairly well-preserved specimen of 
Polyptychites sp. nov. cf. suessi Koenen, 
indicates the presence of the lowest Cretaceous or Valanginian. 
The form differs from Koenen’s type ° in having a deeper and more 
funnel-like umbilicus, and in the weakening of the costation on the 
outer whorl. P. sphaericus Koenen" and P. stubendorffi (Schmidt) 
Pavlow * also are somewhat similar. The loss of the costation on the 
outer whorl is reminiscent of such forms as P. variisculptus Pavlow ° 
and P. sp. (Olcostephanus cf. triptychiformis Nikitin et syzranicus 
1 Loe. cit., 1885, p. 133, pl. v, fig. 20. 
2 E.g. C. [‘‘ Olcosteph.’’] bidevexus Bogoslowsky, ‘‘ D. Rjasan Horizont, seine: 
Fauna, etc.” : Mat. z. Geol. Russl., vol. xviii, 1897, p. 56, pl. 111, figs. 3, 4. 
3 In Murchison, Verneuil, & Keyserling, Géol. d. 1. Russ. d’ Europe, etc., 
vol. ii, pt. iii, Pal., 1845, p. 439, pl. xxxiv, figs. 13-17. Tullberg(‘* Ub. Verstein. 
a. d. Aucellen-Schichten Novaja-Semljas’’: Bihang till K. Svenska Vet.-Akad 
Handl., vol. vi, 1881, No. 3, p. 7) records Craspedites okensis from Novaja- 
Zemlya, where Ameboceras also is found. : 
4 Salfeld (‘‘ Monogr. d. Gattg. Ringsteadia’’: Palwontographica, vol. 1xii, 
pl. ii, 1917, pp. 73-4) points out that certain Involuticeras of a much lower 
horizon have been confused with Craspedites (e.g. by Burckhardt, 1906), but 
the boreal forms here described have no resemblance to the Southern 
Involuticeras. Their poor state of preservation, unfortunately, prevents exact 
comparison with the numerous similar Craspedites of the subditus—plicom- 
phalus group in the Blake Collection. 
5 Argiles de Speeton, 1892, p. 44, pl. v (ii), figs. 1,2; also Sibir. Sept., loc. cit., 
1913, p. 16, pl. i, fig. 4. 
6 “ Die Polyptychites-Arten d. Unt. Valangin.”’?: Abh. k. Preuss. Geol. 
Landesanst., N.F., Heft 59, 1909, p. 76, Atlas pl. xil, figs. 2, 3. 
7“ Die Ammonitid. d Nordd. Neoc.’’: Abh. k. Preuss. Geol. Landesanst..,. 
N.F., vol. xxiv, 1902, p. 122, pl. iv, fig. 1 only. This, however, belongs to 
a higher zone and the suture-line is different. . 
8 “Les Céph. d. Jura et du Crét. Inf. d. 1, Sibir. Sept.” : Res. Scient. d 
lV Exp. Pol. Russ., 1901-3, Sect. C; ‘‘ Geol. & Pal., Livr. 4’’: Mém. Acad. 
Imp. Sct. St. Pét., ser. vir, vol. xxi, No. 4, p. 29, pl. vi, fig. 1. 
9 Ib., p. 19, pl. iii, fig. 2. 
