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FIRST, OR PSILOCERAN BRANCH. 123 
Despl. d. Champ., locality Blumenstein am Thuner See. One of the specimens 
from Filder shows the exact aspect and markings of Psi. planorbe, but has the 
form of longipontinum. Though it is somewhat difficult to judge from a figure, 
nevertheless, Ay. Claust, Neumayr, very closely resembles Psi. longipontinum, 
and we have considered it to be a variety of this species with somewhat stouter 
whorls than the normal form. It is also a large aged specimen, and according to 
Neumayr came from Wiirtemburg. 
Quenstedt referred this species, in his “ Ammoniten des Schwabischen Jura,” 
to Cal. laqueum. is comparisons were evidently made with the old whorl of 
laqueum, and, as this has no keel, and is smooth or with obsolescent pile, it is of 
course very like the adult stages of Psi. longipontinum. Nevertheless, both the 
young and adult stages of daqueum are easily distinguished from the same stages 
of longipontinm. Quenstedt’s figure shows the length of the living chamber to 
have exceeded one volution. 
Tate and Blake’s citation of this species from the Angulatus bed? is likely to 
mislead. Their species is, as figured, a diseased Caloceras, or poorly drawn 
species of Schlotheimia with pile crossing the abdomen, but certainly not, as 
named by them, dongipontinus. 
Species of the second subseries figured by Neumayr in the work quoted 
above are as follows. Psil. eryptogonium, Plate VI., is discoidal. Psdl. majus and 
Gernense, Plate V., are slightly more involute shells. Wiihner, in Volume IV. of 
the work above quoted, figures Ps?/, sublaqueum, Plates XV., XVI., Psil. crebri- 
cinctum, Plates XVI., XVIIL, Psi. pachydiscus and polyphyllum, Plate XVII, all 
discoidal shells. This subseries and the preceding agree closely with the western 
European forms except in the involute species. Wihner also figures, in Vol- 
ume III. of the same work, Psi. Berchta and aphanoptychum, Plate XXIII, 
which are discoidal, and Psi/. pleuronotum, Plate XXV., calcimontanum, Plate 
XXIV., and Aummerkarense, Plates XXIV., XXV., which are more involute and 
compressed.” 
THIRD SUBSERIES. 
Psiloceras Hagenowi, Winner. 
Amm. Hagenowi, Dunx., Paleontogr., I. pl. xiii. fig. 22, pl. xvii. fig. 2. 
Amm. Hagenowi. Trr@. et Prrr., Lias Inf. de Est de la France, Mém. Soc. Géol., VIII. pl. i. fig. 3, 4. 
Amm. Hagenowi, Quenst., Amm. Schwab. Jura, pl. i. fig. 18. 
Psil. Hagenowi, WAHNER, Unt. Lias, Mojsis. et Neum., Beitr., IV. p. 196. 
The form of this shell approximates to that of Psi. planorbe, var. leve, but the 
sutures are more widely distinct, and degenerate in outline. Ih Terquem and 
Piette’s figure they resemble quite closely the sutures of Popanoceras Kingianum 
and antiquum, Goniatitinee of the Dyas. The lobes of that figured by Quenstedt 
are not so coarsely dentate, and approximate more closely to the sutures of Psi. 
1 Yorkshire Lias, p. 273, pl. v. fig. 4. 
2 On Summary Pl. xi., outline figures have been given of the principal forms, aphanopiychum, fig. 11, 
and Aammerkarense, fig. 12. 
