238 Dr. H. Burmeister's Anatomical Observations 



to tlie head, one for the muscles on the superior and inferior part of 

 the body, the fourth is the connecting vessel with the longitudinal 

 trachea, the fifth, which is cut off on each side in my drawing, goes 

 to the stomach, and attends it with many small and large branches 

 to the beginning of the abdomen. The four tracheae also which go 

 into the head, attend the oesophagus, namely, two on the superior, 

 and two on the inferior side. The superior arms are connected to- 

 gether by a transverse branch on arriving at the head (fig. 10, a, a.), 

 their front parts emitting many little branches, which go to the brain 

 and the muscles in the superior parts of the head : the two inferior 

 arms are not connected ; they attend the nervous system (fig. 6, a, a.) 

 and go to the maxillae and the labium in many little branches. 



With respect to the muscular system, I have already described 

 the muscles of the back, but the muscles of the belly side are now to 

 be noticed. In the hind part of the body the same construction is ob- 

 served, namely, two long muscles, which arise at the anus and go to 

 the head, affixed to the membrane between two segments of the 

 body, as represented in my drawing ; but in the three first segments 

 the muscles are very numerous, as I will now describe, from the 

 head towards the abdomen. In the first segment we find the mus- 

 cles for the head and the first feet. The muscles which move the 

 head are continued from the great longitudinal muscles above men- 

 tioned. To this end each longitudinal muscle is divided into two 

 arms, one external going to the margin of the first segment (u), the 

 other internal going to the margin of the head (/3). The external 

 arm of the belly-muscles has at its base a small muscle which goes 

 to the external margin of the segment (y). The muscles of the feet 

 are in all three segments alike, and may therefore be described 

 at once. I must therefore observe that from the internal layer of 

 the skin at the outside of the feet there arises a corneous lamella 

 (fig. 7, A,B,C.), from which one muscle (fig. 8, d.) goes to the hind 

 margin of the foot, moving the leg backwards. Three other small 

 muscles (fig. 8, a, b, c.) arise from the fore and internal margin of 

 the foot, and go to the outside of the back segment, covering each 

 other (fig. 8, a, b, c). These muscles move the leg during walking. 



Between the first and the second a little corneous lamella exists, 

 (fig. 7, D, E.) whicii separates them from each other, but is not con- 

 nected with either of them. The whole apparatus is smaller in the 

 anterior leg, and largest in the four posterior legs, as my drawing 

 (fig. 7.) will show from the size of the lateral corneous lamellae, 

 from which arise the first-named muscles. In the internal space of 

 the leg we see three muscles, which go from one joint of the leg to 

 the next, and move the several joints. Between these muscles 



