354 MISS E. J. BECK ON THE MUSCULAR 
median line. It runs laterally to the exterior portion of the interior margin of the 
coxal sclerite of the first appendage. 
The interior first dorso-coxal muscle (110) is a large muscle, the larger part of which 
is attached posteriorly, the smaller part more laterally, to the carapace ; these are united 
in a common origin at the interior portion of the interior margin of the coxal sclerite 
of the first appendage. 
The superior first dorso-coval muscle (111) is attached posteriorly to the carapace. 
It is a narrow muscle, running underneath the larger part of the last-mentioned 
muscle, and is attached anteriorly to the superior portion of the coxal sclerite of the 
first appendage. 
The anterior second dorso-coaal muscle (112) is a thick muscle attached posteriorly 
to the carapace, and running forward to the antero-lateral portion of the interior 
margin of the second coxal sclerite. 
The posterior second dorso-coxal muscle (113) is attached to the carapace towards its 
lateral portion and to the postero-lateral portion of the interior margin of the second 
coxal sclerite. 
The third dorso-coxal muscle (114) is attached to the lateral portion of the carapace 
and to the antero-lateral portion of the interior margin of the third coxal sclerite. 
The fourth dorso-cowal muscle (115) is attached to the lateral portion of the carapace 
and to the antero-lateral portion of the interior margin of the fourth coxal sclerite. 
The anterior fifth dorso-coval muscle (116) is attached to the carapace near the 
median line, at its posterior portion, and to the antero-lateral portion of the interior 
margin of the fifth coxal sclerite. 
The posterior fifth dorso-coval muscle (117) is attached to the lateral portion of the 
carapace and to the postero-lateral portion of the interior margin of the fifth coxal 
sclerite. 
The anterior sixth dorso-coval muscle (118) is attached to the posterior portion of 
the carapace near the median line and to the antero-lateral portion of the interior 
margin of the sixth coxal sclerite. 
The posterior siath dorso-coxal muscle (119) is attached to the lateral portion of the 
carapace and to the postero-lateral portion of the interior margin of the sixth coxal 
sclerite. 
Coxal Entosclerite Muscles.—The extrinsic muscles of the coxal entosclerites are 
attached to the plastron and to the carapace. Those running from the plastron are 
attached to the posterior surfaces of the third and fourth posterior coxal entosclerites, 
and have been mentioned under the muscles attached to the plastron (74, 78). 
‘There are four muscles from the carapace to the coxal entosclerites, two of which 
are attached to that of the first appendage, and one to each of the posterior coxal 
entosclerites of the third and fourth appendages. 
The lateral first dorso-coxal entosclerite muscle (120) is attached to the lateral portion 
