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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 97 



nearly semicircular in extent (fig. 29), since they are attached dorsally 

 high up on the back external to the dorsal muscles, and ventrally along 

 the midline of the body external to the median ventral muscles. 



By removing a section of the lateral muscles and the more lateral 

 fibers of the dorsal muscles (fig. 30, left), there will be exposed two 

 flat external laterodorsal longitudinul muscles (4, 5) lying above the 

 leg base, an external lateroventral longitudinal muscle (6) mesad of 

 the leg base, two dorsal muscles of the leg (y, 8), and a layer of 



Pig. 30. — Muscles of body wall of Peripatoidcs novae-zealmidiae Hutton. 

 The various muscle layers exposed on right side of three successive segmental 



/, dorsal longitudinal muscles ; 2, ventral longitudinal muscles ; ,?, dorsoventral 

 lateral muscles ; 4, 5, internal and external laterodorsal longitudinal muscles ; 

 6, lateroventral longitudinal muscles ; 7, dorsal promotor of leg ; 8, dorsal re- 

 motor of leg ; 9, internal oblique muscles ; 10, external oblique muscles (9 and 

 10, reversed in position between legs) ; //, ventral promotor of leg; 12, ventral 

 remoter of leg ; 13, circular muscles. 



oblique muscles (p, 10). The fibers of the leg muscles penetrate 

 between the oblique fibers to make attachments on the body wall. 



The oblique muscles (fig. 30, p, 10) lie external to all the other 

 muscles thus far described. They consist of two thin sheets of fibers 

 crossing each other at right angles in opposite directions. The fibers 

 that are internal on the back (p) go from above downward and for- 

 ward; those that are external dorsally (/o) go downward and 

 posteriorly. Just above each leg, however, a broad band of the ex- 

 ternal fibers becomes internal by crossing over a similar band of the 

 otherwise internal fibers (p) going below the leg from behind. Between 



