38 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 92 



on a heavy tendon attached to the upper postaxial border of the coxo- 

 podite. The leg base is pulled backward by the contraction of this 

 muscle. 



Fig. 13. — Transverse section of the thorax. 



A, section through the third pereiopod. 



122b, branch of musculus promotor of second pereiopod; I33c-g, branches 

 of musculus promotor of third pereiopod; 136a, branch of musculus depressor 

 of third pereiopod ; i^y. musculus reductor meropoditis of third pereiopod ; 

 138. musculus abductor carpopoditis of third pereiopod ; 139, musculus adductor 

 carpopoditis of third pereiopod ; 140. musculus productor propoditis of third 

 pereiopod; 141. musculus reductor propoditis of third pereiopod; 142. musculus 

 abductor dactylopoditis of third pereiopod ; 143, musculus adductor dactylo- 

 poditis of third pereiopod; 135a, branch of musculus promotor of fifth pereiopod; 

 I56d, branch of musculus remotor of fifth pereiopod; 137a, branch of musculus 

 levator of fifth pereiopod. 



B, section through the first pereiopod. 



14, musculus attractor epimeralis ; iiia-b, branches of musculus promotor of 

 first pereiopod; 114a. branch of musculus depressor of first pereiopod; 115, 

 musculus reductor meropoditis of first pereiopod ; 116, musculus abductor 

 carpopoditis of first pereiopod; ///, musculus adductor carpopoditis of first 

 pereiopod; 118. musculus productor propoditis of first pereiopod; 119. musculus 

 reductor propoditis of first pereiopod; 120. musculus abductor dactylopoditis 

 of first pereiopod ; 121. musculus adductor dactylopoditis of first pereiopod ; 

 I22b, branch of musculus promotor of second pereiopod; 133b, branch of mus- 

 culus promotor of third pereiopod. 



US a-c. Musculus levator a-c (fig. 12 A, B). — The first branch 

 (a) originates on the anterior border of the endosternite separating 

 the fourth and fifth thoracic segments. It passes outward to its inser- 

 tion on the upper postaxial j^roximal border of the coxopodite. A sec- 

 ond and much shorter branch {b) begins on the lower rim of the inter- 



