MOVEMENTS OF VOLUNTARY MUSCLE. 
495 
Explanation of the Plates. 
Unless otherwise stated , the figures are represented as seen under a magnifying power 
of 300 diameters. 
PLATE XVI. 
Fig. 1. Human pectoralis major, macerated in liquor of ammonia. Transverse 
section, showing the prismatical form of the primitive fasciculi. A wet 
specimen. 
Fig. 2. Flat primitive fasciculus, from the Staghorn Beetle ( Lucanus cervus ). 
Fig. 3. Transverse section of a large primitive fasciculus from the Skate ( Raia 
Batus), showing the extremities of the primitive fibrillae, and the corpus- 
cles throughout its interior. 
Fig. 4. Transverse section of primitive fasciculi from the Haddock ( Gadus 
Qdglejinus ), showing everywhere the extremities of the fibrillae in close 
apposition with one another. Some few are more distinct than the rest. 
The disparity in size between contiguous fasciculi is here exemplified. 
Fig. 5. Transverse section of primitive fasciculi from the leg of the Frog, showing 
the same points. 
Fig. 6. Transverse section of primitive fasciculi from the Boa, showing the same. 
Fig. 7- Transverse section of primitive fasciculi from the pectoral muscle of the 
Teal ( Querquedula crecca), showing the same. In this, the extremities 
of the fibrillae are particularly evident and far apart, and at a the sarco- 
leinma is seen. Treated with weak acid. 
Fig. 8. Transverse section of primitive fasciculi from the human biceps, showing 
the fibrillse everywhere, but most distinctly near the surface. 
Fig. 9. Primitive fasciculus partially fractured, and its interior displayed. The frac- 
ture on the outside follows the direction of the transverse striae, while in 
the interior the broken fibrillse are of various lengths. All these fibrillse 
present a series of dark and light points. From the Boa : 400 diameters. 
Fig. 10. Mass of primitive fasciculi (from the leg of a Rabbit at birth), stretched 
and partially ruptured. The form of the fibrillse still connecting the 
broken parts is seen more highly magnified in several sketches, h, h, h, and 
also how their segments conspire to form transverse and longitudinal 
striae, c. 
Fig. 11. Part of a fibrilla from the rectus oculi of a large fish (Shark ?) that had been 
long immersed in spirit, very highly magnified to show the form of the 
segments. 
Fig. 12. Fragment of a fibrilla from the heart of the Turtle, showing the form of 
the segments. Obtained by maceration. 
