L. F. Spath—Ammonites from Spitsbergen. 353 
of the Kimmeridgian and Portlandian may be represented, and 
that the so-called A. triplicatus includes a variety of forms. 
The specimen referred to Virgatites cf. scythicus, Vischmakofi 
sp., is very close to, but more evolute than, Michalski’s figure 2 * 
of that species, and has the same fine, dichotomous costation. It 
is preserved in a slightly different shale, without Avwcella, that 
resembles the matrix both of Rasenia and of that of the gigantic 
Virgatites cf. nikitini, which latter includes crushed Aucella. This 
specimen of Virgatites, 240 mm. in diameter (with two fragmentary 
specimens of a closely comparable form), superficially resembles 
the large Ammonite figured by Nikitin® as Perisphinctes martellr 
Oppel, but which Siemiradzki* considers to be an intermediate 
form between P. martelli and P. orientalis Siemiradzki. Large 
“ Perisphinctes”” of the group of P. warte Bukowski are recorded 
from beds that contain an early (Corallian) development of 
Ameboceras (‘zone of P. warte and Cardioceras alternans”’ in 
Salfeld 5), but the crushed example here discussed, with its Aucella 
(not radially marked), is a Virgatites,° and not a Corallian ‘ Peri- 
sphinctes’’, that is to say, it comes from above, not from below, the 
micaceous shales with Ameboceras cf. nathorsti. 
The specimens of Rasenia apparently came out of nodules in the 
black shales, and since Salfeld’ records Ameboceras kitchina 
from the zone of Rasenia cymadoce, it is possible that they belong 
to the same horizon as the micaceous shales with Ameboceras ct. 
nathorsti. The specimens are not very well preserved, and there 
does not seem to be a very close resemblance to the common Market 
Rasen species (R. evoluta, involuta, etc.). The example compared 
with de Loriol’s figure of R. trimera,® with a diameter of about 
150 mm., exceeds in size the form of Rasenia figured by Quenstedt ° 
as A. ef. trifurcatus Zieten. 
1 A comparable specimen in the Reynolds Collection comes from Ula 
Berg, North Side of Van Keulen’s Bay, Bell Sound. 
2“ T), Amm. d. Unt. Wolga- Stufe’’: Mém. Com. Géol. St. Pét., vol. vill, 
No. 2, 1890, p. 121, pl. vii, fig. 2 only. 
3“ Allo, Geol. Karte v. Russland, Blatt 71, Kostroma’’: /ém. Com. 
Géol., vol. ii, No. 1, 1885, p. 125, pl. ii, fig. 14. 
4‘ Monogr. Beschreib. d. Amm. Gattung Perisphinctes”’ : 
graphica, vol. xlv, pts. iv, v, 1898-9, p. 269. 
5 “ Die Gliederung d. Ob. Jura in N.W. Europa, ete.”’: N. Jb. f. Min., etc., 
Beil. Bd. 37, 1914, p. 129, and table i. 
6 There is very good agreement with Per. nikitini Michalski (loc. cit., p. 232, 
pl. xiii, fig. 1), but the much larger outer whorl has the aspect of that of such 
gigantic forms as Virgatites virgatus (in Michalski, loc. cit., pl. iii, fig. 1) or of 
“« Perisphinctes” losseni Neumayr & Uhlig (‘“‘ Ub. Ammonitid. a. d. Hilsbild. 
Norddeutschl.”’: Paleontogruphica, vol. xxvii, pts. iii-vi, 1881, p. 144, pl. xvii). 
The inner whorls characterize the latter as probably a Polyptychites, so that 
the resemblance of the outer whorl is only superficial. 
7 Loe. cit., 1914, p. 129; also ‘‘ Certain Upper Jurassic Strata of England ”’ : 
Quart. Journ. Geol. Soc., vol. Ixix, 1913, p. 423. 
8 “Mon. Pal. z. & A. tenwilabatus, etc.’’: Mem. Soc. Pal. Suisse, vol. iii, 
1876, p. 86, pl. xiii, fig. 13. 
9 Amm. d. Schwib. Jura, 1888, p. 998, pl. exii, fig. 3. 
VOL. LVIII.—NO. VIII. 23 
Palecnic- 
