355 
[Dwight. 
Tig. 2. Orthoceras I'hythmoides. Yoerste. View of the interior cast. B. 0. 
Fig. 3. Orthoceras ( Actinoreras ) Youngi , Foerste. A vertical section 
showing the siphon on one side. H. I. 
Fig. 4. Orthoceras ( Actinoceras ) lata-nnmmulatus , Foerste. A vertical 
section through the siphon. S. O. 
Fig. 5. Orthoceras annulatum, Sowerby. A badly preserved exterior. 
B. 0. 
Fig. 6. Orthoceras (. Actinoceras ) Baytonensis, Foerste. A vertical sec- 
tion passing through the siphon. S. 0. 
Fig. 7. Orthoceras ( Actinoceras ) turgida-nummulatus , Foerste. A verti- 
cal section passing through the siphon. S. O. 
Fig. 8. Gomphoceras. Fig. 8a, a side view of the living chamber; fig. 
86, a transverse section of the same near the last septum. B. 0. 
PLATE IX. 
Figs. 1-6. Streptelasma Roskinsoni, Foerste. Figs. 1, 2, 3, 4, various; 
typical forms ; fig. 5, a very contorted form doubtfully referred here 
fig. 6, a transversely wrinkled form, perhaps an Amplexus, provisionally 
referred here. B. 0. 
Figs. 7, 12, 13. Streptelasma calycula, var. geometricus, Foerste. Fig. 
7, the type specimen, S. O. ; fig. 12, a similar form, Todd’s Fork, Ohio; 
fig. 13, a larger form referred here. S. O. 
Fig. 8. Cyathopliyllum facetus, Foerste, found at the roadside quarry 
east of S. 0. 
Figs. 9-11. Cyathophyllum celator var. Baytonensis, Foerste. Figs. 9, 
10, from S. 0. ; fig. 11, probably from the same place, now in the cabinet 
at the Ohio State University. 
Figs. 14, 15. Streptelasma? obligator, Foerste. Fig. 1L, typical form; 
fig. 15, perhaps larger form of the same. H. I. 
Fig. 16. Lituites? B. O. 
Note. — The following corrections in the references to plates in the text 
should be made : On p. 268, Plate III should be Plate V, and Plate IV 
should be Plate VI ; Plate IV on page 272 should read Plate VI. 
General Meeting, November 6, 1889. 
The President, Prof. F. W. Putnam, in the chair. 
Prof. Thomas Dwight read a paper on the “ Joints and Muscles 
of Contortionists.” 
Professor Dwight began by stating that this was essentially a 
more scientific treatment of the subject of his paper in Scribner’s 
Magazine of April, 1889. He referred to the “ forward ” and “back- 
ward ” varieties of contortionists. Occasionally the same man can 
