CIRCULATORY SYSTEM IN ARACHNIDA 



165 



CN DS 



LEP 



DVM 



PTP 



PE 



^ H 



LHY 



Text figure B. Centrurus insulanus, late embryo. Transverse section through 

 the heart in the region of the third abdominal segment, showing the ligaments. 

 The drawing was made from two sections, as not all ligaments are in the same 

 plane. The epi- and hypocardiac ligaments are in one plane, while the pteripyles 

 and alar are ligaments in another. AL, alar ligaments; CN, cardiac nerve; DS, 

 dorsal pericardial sinus; DF.V, dorsoventral muscle; H, heart; i?FP, hypodermis; 

 LEP, epicardiac ligaments; Li/ F, hypocardiac ligaments; LM, dorsal longitudinal 

 muscles; LS, lateral pericardial sinus; PE, pericardium; PTP, pteripyle; VS, 

 ventral pericardial sinus. 



