Ap. 
ar. 
d.c.en. 
Ec or ec. 
Ect. 
Ence. 
Ent'-Ent’. 
gd. 
gP- 
al. 
lat. scl. 
lc.en. 
L.p.c.en. 
M. 
mb. 
MR. W. B. S. BENHAM ON THE MUSCULAR 
Aperture leading to the space between 
the two plates forming a mesosomatic 
appendage. 
Anterior process of the mesosomatic 
sternite. 
. Chitinous bar in mesosomatic appen- 
dage. 
. Canal in the side wall of the mesosoma. 
Camerostome (chitinized upper lip). 
Conyexity of the lateral region of the 
prosoma. 
. Coxal pivot. 
Dorsal process of the plastron, or dorsal 
metaplastral process. 
Entapophysial ligament. 
Cut portion of the same ligament. 
Entocoxite. 
The seven entapophyses. 
Genital duct. 
Genital pore. 
Inner lobe of a mesosomatic appendage. 
Intestine. 
. “Knob” of entocoxite, to which the 
tergo-coxal muscle is attached. 
. Liver and genital organ. 
. Lamellw, forming the “ gill-book ” of a 
mesosomatic appendage. 
Lateral sclerite. 
Lateral cornu of plastron, or proplastral 
cornu. 
Latero-posterior process of plastron, or 
lateral metaplastral process. 
Mouth. 
Membrane of attachment of the pygal 
muscles, 
M, N, 0, P, J, 7; 8, t, y, = Portions of the plastro- 
ml, 
mst. 
mist. 
coxal muscles 32-44, 
Median lobe of a mesosomatic appen- 
dage (part of the sternal wall pro- 
duced). 
Mesosomatic tergite. 
Metasternite or “ chilaria.” 
N. 
Na. 
ts —ts*l, 
Ve or ve. 
Ww. 
xX, 
x. 
References to Muscles. 
4a. Muscle from first to second entapophysis, 
1, Dorsal entapophysio-plastral. 
2. Ventral entapophysio-plastral. 
3, Ventral longitudinal. 
4, Inter-entapophysial. 
Network of chitin on the inner surface 
of the carapace. 
Angle of the posterior carapace belong- 
ing to metasomatic area. 
. Aperture of the branchial blood-vessel 
into the venous collecting sinus. 
. Esophagus. 
Outer lobe of a mesosomatic appendage. 
. Plastron or thoracic entosternite. 
. Chitinous sclerite on mesosomatic appen- 
dage. 
Postabdominal, or metasomatic sternite. 
. Posterior border of the thoracic carapace, 
. Posterior border of an entocoxite. 
: Pericardium. 
Posterior process of the plastron or 
lateral metaplastral process. 
. Pro-sternite. 
. Posterior process of a mesosomatic ento- 
chondrite. 
Prosomatic sternite. 
. Metasomatic tergite. 
. Rectum. 
Ventral ridge of a mesosomatic ento- 
chondrite. 
Ridge on the inner surface of the tho- 
racic carapace. 
. Muscular stomach. 
Mesosomatic entochondrites. 
Subfrontal sclerite. 
Subfrontal area. 
. Postanal spine or “ pyge ” (xvy#). 
. Aperture (stigma) leading into the hollow 
tendon of a branchio-thoracic muscle. 
. Tergite. 
The hollow tendons of the branchio- 
thoracic muscle. 
Venous collecting sinus. 
Wall of mesosoma. 
Portion of mesosomatic sternite, 
Point of attachment of mesosomatic 
appendage. 
4b, From first to third entapophysis. 
4c. From first to fourth entapophysis. 
4d. From first to fifth entapophysis. 
