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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 92 



Another branch (c) arises in the extreme lateral border of the pro- 

 topodite not far from the insertion of the remoter and passes inward 

 to its insertion anterior to that of the main branch on the posterior wall 

 of the protopodite. The levators move the basipodite outward and 

 forward. 



Crpd^ 110^109 108 107 lOG 105 



Fig. II. — The third maxilliped. 



g6, musculus promoter III pedis maxillaris; 9}', musculus remotor III pedis 

 maxillaris ; gSa-c, musculus levator a-c III pedis maxillaris ; 99, musculus 

 depressor III pedis maxillaris; 100, musculus adductor exopoditis III pedis 

 maxillaris; loi, musculus abductor exopoditis III pedis maxillaris; 102, musculus 

 abductor flagelli III pedis maxillaris; 103, musculus flagellaris exopoditis III 

 pedis maxillaris; 104, musculus flexor meropoditis III pedis maxillaris; J05, 

 musculus extensor meropoditis III pedis maxillaris; 106, musculus flexor 

 carpopoditis III pedis maxillaris ; 107, musculus flexor propoditis III pedis 

 maxillaris ; 108, musculus extensor propoditis III pedis maxillaris ; 100. 

 musculus flexor dactylopoditis III pedis maxillaris; no, musculus extensor 

 dactylopoditis III pedis maxillaris. 



Crpd, carpopodite ; Dcpd, dactylopodite ; Eppd, epipodite ; Expd, exopodite ; 

 Iscpd, ischiopodite ; Mrpd, meropodite ; Prpd, propodite ; Prtpd, protopodite. 



9Q. Musculus depressor III pedis maxillaris (fig. 11). — This is a 

 very heavy muscle which originates over a relatively broad area on the 

 epimeral plate beneath and beside the promotor, as well as the dorsal 

 side of the endopleurite. Its many branches run forward and inward 

 to join before the insertion of the muscle on the ventral median distal 

 part of the protopodite. It opposes the levators. 



