SECOND, OR SCHLOTHEIMIAN BRANCH. 129 
First SUBSERIES. 
Schlotheimia catenata, Winner. 
Summ. Pl. XI. Fig. 3. 
Amm. catenatus, Sow., De la Beche, Traité de Géol., p. 407, fig. 67. 
Amm. catenatus, D’OrB., Terr. Jurass. Ceph., p. 301, pl. xciv. 
4igoc. catenatus, Wrieut, Lias Amm., p. 320, pl. xix. fig. 5-7 ; pl. xvii. fig. 3-6. 
Schlot, catenata, WAn., Unt. Lias, Mojsis. et Neum., Beitr., [V., 1886, p. 196. 
Aigoc. subangulare, Wiu., Unt. Lias, Mojsis. et Neum., Beitr., [V., 1886, p. 162. 
Amm. angulatus thalassicus, QueNst., Amm. Schwab. Jura, pl. ii. fig. 9 (not fig. 4, 5). 
Amm. angulatus psilonotus, QuENST., Ibid., pl. ii. fig. 10, 11. 
Amm. angulatus hircinus, QuENST., Ibid., pl. ii. fig. 12. 
Amm. angulatus oblongus, QUENST., Ibid., pl. ii. fig. 6. 
Agoc. angulatus, Neum., Unterst. Lias, Abhandl. geol. Reichsans., WII. p. 38, pl. ii. fig. 5. 
ZEigoc. subangulare, Nuum., Ibid., p. 33. 
Localities. — Chevigny near Semur, Balingen, Diebrook near Ravensburg, Miihlhausen, Coppenbriigge 
in Westphalia, Hildesheim, Markoldendorf. 
In the collection of the Museum of Stuttgardt from the Planorbis bed there 
is a specimen of this species, which is more discoidal than Sehlot. angulata, and 
more like Weehneroceras in its aspect than any other members of this series, and 
the same facts are observable in Quenstedt’s collection. In the collection at 
Semur there are three specimens from the Planorbis bed correctly named cadenatus. 
They are not large, and one specimen at the diameter of 52 mm. shows signs of 
old age in its obsolescing pila and smooth abdomen. We have also examined 
D’Orbigny’s types and confirmed these comparisons. Neumayr compares his 
specimen from the Planorbis bed of Pfonsjoch with the North German species of 
angulatus, which is a true catenatus, and in Professor Emerson’s collection from 
Markoldendorf, now at Amherst, Mass., all specimens of this species agree very 
closely with catenalus as figured by Quenstedt. The pile cross the abdomen with 
a forward bend, but in one precisely the peculiarities of Quenstedt’s Fig. 12 
are exhibited, the pile being straight as they cross the abdomen. <Amm. ang. 
oblongus, Quenst., may be a large variety; the whorl as figured resembles that of 
catenala. 
Schlotheimia striatissima, Hyarr. 
Amm. angulatus striatissimus, Quenst., Amm. Schwab. Jura, pl. iii. fig. 2. 
Amm. angulatus striatus, QuENsT., Ibid., pl. iii. fig. 8-5. 
Locality. —Semur. 
Two specimens of this species in the Museum of Comparative Zodlogy and 
Quenstedt’s descriptions and figures show that it is a discoidal shell like cadenaéa, 
but the abdomen is narrower, the whorl more compressed, and the pile more 
numerous and finer than in that species. They remind one in this respect of the 
second subseries, but unfortunately there are no transitional modifications by 
which to follow out the connection, if it existed, with these dwarfed forms of the 
Oxynotus bed. The mould of the young specimen supposed by Quenstedt to 
17 
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